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Topic Archives => Build Alongs => Topic started by: cooter on February 08, 2004, 01:20:00 PM

Title: How to tiller a banana bow
Post by: cooter on February 08, 2004, 01:20:00 PM
(http://www.ozbow.net/phpbb2/album_pic.php?pic_id=248)

Here's pic #1. If you can see the measurement on the tape its reading roughly 13-1/4 inches of reflex. A little more than I wanted to tackle. If someone told me sinew is capable of adding another 5 inches of reflex to a bow I'd have thought they were nuts. Not any more.
Title: Re: How to tiller a banana bow
Post by: '46 on February 08, 2004, 01:27:00 PM
Cooter, I've never had the pleasure of making a bow out of bannana  :D  

Mannnn...it looks like the sinew stuck this time , huh?  :thumbsup:
Title: Re: How to tiller a banana bow
Post by: cooter on February 08, 2004, 01:38:00 PM
(http://www.ozbow.net/phpbb2/album_pic.php?pic_id=249)

Here's pic #2. I'll be floor tillering this bow for a while I think . This is a picture of the upper limb flexing. My main goal is to get both limbs to straighten out for me. The top limb is looking good, but the lower limb need some scraping yet. Once I get  the lower limb to come straight for me I think the trick will be to get the limbs to turn. Then once the limbs have turned I have a sneeking suspission I shouldn't need to do a lot of scraping to bring the bow to final tiller. I guess we'll see.

Any advice as to how I should proceed would be greatly apreciated. After all I am flying blind with this one   :bigsmyl:  

Marc,

If you have any pics of your banana bow please do so.

Thanks,
Cooter
Title: Re: How to tiller a banana bow
Post by: Madpigslayer on February 08, 2004, 01:42:00 PM
Cooter, that second pic put a big ole smile on my face!!!! ON THE CARPET!!!! I am gonna show "her" that picture when she gets home!!!

I will be watching this thread...all the way to the end  :D  

My friend, I wish you all the luck in the world.  :)
Title: Re: How to tiller a banana bow
Post by: ks chas on February 08, 2004, 02:55:00 PM
Cooter I started one of those things 3 years ago at MOJAM. It still isnt finished.If you think floor tillering is a trick wait until you try to put a string on the thing and put it on a tree. GOOD LUCK Im watching to see how you get along  ;)
Title: Re: How to tiller a banana bow
Post by: George Tsoukalas on February 08, 2004, 03:16:00 PM
OMG, Cooter. Hope you are using a rope and pulley.
Jawge
Title: Re: How to tiller a banana bow
Post by: Bob Barnes on February 08, 2004, 03:27:00 PM
way cool Cooter...you can do it.  Heck Marc's bows look like that AFTER they are tillered...  :)
Bob
Title: Re: How to tiller a banana bow
Post by: cooter on February 08, 2004, 03:53:00 PM
(http://www.ozbow.net/phpbb2/album_pic.php?pic_id=250)

Here's a pic after I worked on that lower limb some. Getting closer, I'm holding the top limb and try to keep equal pressure on both limbs when I'm floor tillering this thing. From the pic it almost looks as if the top limb is starting to turn while the bottom isn't quite there yet. I can't beleive my son snuck into that pic like he did. I never saw him and am sure glad the bow didn't decide to go south right then and there. As a fly by the seat of my pants bowyer, she's not looking too bad for right now, but I've only been at it for a day so there is still plenty of time for something to happen that I'm not going to like.  :bigsmyl:

George, I'll give you a call later, We still on for next weekend? We're planning to come up Friday and go home Sunday.

Cooter
Title: Re: How to tiller a banana bow
Post by: Ralph Renfro on February 08, 2004, 04:32:00 PM
Cooter, you could always cut it into in the middle of the handle and use each limb for a rocker and just build that boy a rockin chair.
You are a work of art my man. You and that dang sinew are book worthy. INCREDIBLE!! KsBow  :bigsmyl:
Title: Re: How to tiller a banana bow
Post by: the Ferret on February 08, 2004, 05:12:00 PM
OMG Cooter that thing is WILD! Like Ralph said wait until you try and string that sucker and get her on the tree. I call them rodeo bows...get a string on her and see if you can hold her for 8 seconds without it turning inside out.   "[tunglaff]"  

I showed Dianne the pics and she just keeps mumbling about the carpet..something like "I'd kill him" ha ha

Course I tracked quite a bit of yeller onto our carpet this weekend myself

Here's a trick Marc tought me about checking the limbs bending on a bow like that (over 6" of reflex). Put the bow horizontally in a padded vice, back towards you, then you can push on the limb tips (one at a time) to see how each limb is bending.
Title: Re: How to tiller a banana bow
Post by: Timo on February 08, 2004, 06:17:00 PM
Cooter, Cotter, Cotter.That thing is wild!  :scared:  

You don't knapp rocks on that carpet, do you?
Title: Re: How to tiller a banana bow
Post by: AZStickman on February 08, 2004, 06:33:00 PM
Cooter that's like having to tiller a bow twice..... Once to get it to where ya have it and once more to get her shooting.....  :D  .... Nice job so far..... Terry
Title: Re: How to tiller a banana bow
Post by: cooter on February 08, 2004, 07:36:00 PM
Tomo,

Not exactly on the carpet, we got a tile floor in part of the basement that I knap on. Besides, thats what tarps are for and I sure as heck aint going go knapp outside this time of year in Minnesota   :scared:  

  (http://www.ozbow.net/phpbb2/album_pic.php?pic_id=251)

Now for the banana bow, I put it on my tillering tree and jury rigged a harness to set bricks on to see how things are bending. I'll get a pic up later. two things I found out. First is that bottom limb is stiffer than the top and is twisting twords me when looking at the bow on the tree. Now not only do I need to think about taking some weight off that lower limb but where exacty I want to remove that weight from the limb. This bow is definitely going to be a challenge.

Cooter
Title: Re: How to tiller a banana bow
Post by: Madpigslayer on February 08, 2004, 07:39:00 PM
Cooter, I like you already.  :D  

this is gonna be fun. You might wanna consider some kind of "protection" if you know what I mean....haha.
Title: Re: How to tiller a banana bow
Post by: lcoast on February 08, 2004, 07:58:00 PM
Cooter you and the comments you are generating from the audience are scaring me. I got a couple of staves that look very similar and they ain't got no sinew on them. One is twisted and the other is bent back perfectly. Sure hope this works for you. I need some confidence generated now.   :)


=keith=
Title: Re: How to tiller a banana bow
Post by: gifford on February 08, 2004, 08:21:00 PM
cooter, this is going to be a great build along, I shall be following this one. If you do put it on the tree, I would suggest a padded c-clamp to keep it there. It is going to want to flip. The tip Mickey gave was a good one for initial flexing.
Title: Re: How to tiller a banana bow
Post by: Ralph Renfro on February 08, 2004, 09:48:00 PM
Cooter, it's apparent that you're suffering from Sinewitis. I've hear that it affects you physically and emotionally. Only cure is to finally get one shootable bow with sinew on the back. The a feeling of euphoria will set in and you won't feel the need to devote so much time and effort into you sinew projects. Good Luck Buddy!
Title: Re: How to tiller a banana bow
Post by: cooter on February 08, 2004, 10:13:00 PM
Mickey,

I had to read your post about a half dozen times before actually figuring out what you were talking about. That is a good idea, thanks.

AZstickman,

You are correct, well, in a way. My first tillering goal was to get the limbs bending to give me a flat profile and I think I'm there.  Now I'm shooting for the turning point, then comes the magic to 18 inch draw length and working on getting her to brace height, then final tillering to draw length/ weight.

For now I got to consider limb twist/tip twist on that lower limb. I did some scraping on her tonight trying to remove wood from the strong side of this lower limb and now it's looser than the top limb but the twist is still there. Now I'm debating if I want to continue scraping the stong side of that limb to see if I can get ride of it's desire to twist or add some sinew to strengthen that area of the bow to eliminate the twist. I guess I do have a third option and thats to sand some sinew of the back side of the limb on the side opposite the direction the twist wants to go? Anyone have some advice on how I should handle that tip twisting.

As promised here is the contraption I'm using to look at how the limbs are bending relative to an applied known weight. Total weight applied is 22 lbs. The lower limb moved maybe 2 inches while the upper limb moved maybe an inch. What I do like about the set up is you can bounce the bricks slightly to watch how the limbs move relative to each other.

BTW, This bow does kick like a mule and has now officially now drawn blood  :mad:  First time on the tillering tree to boot but don't worry the bow is fine  :bigsmyl:  

  (http://www.ozbow.net/phpbb2/album_pic.php?pic_id=252)

Thanks for all the support and please by all means if you've got any advice, please give it, I think hack might need all the help he can get on this one.

Thanks,
Cooter
Title: Re: How to tiller a banana bow
Post by: rocdoc on February 08, 2004, 10:18:00 PM
Cooter.....ain't ya gonna curve them tips any to give that wimpy stave a little kick?  ;-)

BTW....how long you been outta the institution??  Hope you buy some more life insurance 'fore you start stringin' that thing!
Title: Re: How to tiller a banana bow
Post by: Chris R on February 08, 2004, 11:23:00 PM
Cooter, this is beautiful  :thumbsup:   I'm loving it  :thumbsup:    :thumbsup:  .  

On the limb that's twisting toward you, is the sinew thicker on one side of the limb than the other?  If so, it will want to twist toward the weak side.  Also, on the stronger limb, how's the wood look compared to the other?  If I remember from one of your earlier threads, you've got a boat load of sinew on that puppy.  You might want to consider filing the sinew a little to get the tiller more even.

I've never tried it, but this is one bow you might want to consider two sets of nocks on, one for the string, and one for a long string to brace it.

Good luck!! we'll all be watchin  :thumbsup:  

Chris
Title: Re: How to tiller a banana bow
Post by: Terry Riley on February 09, 2004, 12:57:00 AM
Cooter,
       You're doing a great job so far. Gotta admire a guy who'll try just about anything. I'm pulling for you man....I wanna see the string on that dude.
Terry
Title: Re: How to tiller a banana bow
Post by: '46 on February 09, 2004, 11:22:00 AM
Calvin:  ..."Cooter, that second pic put a big ole smile on my face!!!! ON THE CARPET!!!! I am gonna show "her" that picture when she gets home!!!"

HA!!! MPS!, we are all here rank amatures next to Cooter when it comes to building bows in the living room, raising the wrath of "Her" and avoiding death.

I've seen that boy attack, with vigor, monster staves...in the house...WITH AN ANGLE GRINDER.  :scared:    :scared:  Now that's serious dust  :D  

He only is alive today because of her great compassion  :)

geo
Title: Re: How to tiller a banana bow
Post by: John Scifres on February 09, 2004, 12:49:00 PM
Cooter,

Man that is awesome.  You've gone a lot farther on that thing than I would have even tried.  Stay with it.  You are an inspiration :-)

John
Title: Re: How to tiller a banana bow
Post by: Jason Jelinek on February 09, 2004, 01:09:00 PM
Cooter,

You're first problem is that Bison sweatshirt... You've got to wear a Sioux sweatshirt tillering a sinew backed bow.   ;)

Seriously, you should have put siyahs on the ends and horn on the belly when you tackle something with that much reflex.  I've gotten to the point where I don't like any glued in reflex, I'll take the set.  I've found that the limb thickness taper is very different on my reflexed bows than those with no glued in reflex.

Good luck with that bow, although I think you might find that the handle area may not be stiff enough by the time you get to full draw.

Jason
Title: Re: How to tiller a banana bow
Post by: '46 on February 09, 2004, 02:59:00 PM
Cooter, joking aside...thats some serious  reflex. Good job on the sinew. Looking forward to following your progress.

I can't get together this weekend, but would really like to see it in person maybe the next week. I'll call ya later.
Title: Re: How to tiller a banana bow
Post by: Chris R on February 09, 2004, 03:47:00 PM
Quote
Originally posted by George Nagel:
I've seen that boy attack, with vigor, monster staves...in the house...WITH AN ANGLE GRINDER.   :scared:      :scared:   Now that's serious dust   :D  
LMAO  "[laffsmyl]"    Man, I'd be living in the garage if I did that.

Chris
Title: Re: How to tiller a banana bow
Post by: cooter on February 09, 2004, 05:03:00 PM
Ralph,
Thanks for the kind words. I'm actually speachless if you can beleive that. I'm not use to being talked to like this and think its shocking my system   :knothead:  

Jason,
I've thought about that a lot. I have no idea how much compression osage can handle and have got to beleive these tips are going to need to travel some where between 20 to 24 inches before I reach draw length, which I'm sure is going to put the belly under tremendous compression stresses. As for the handle, I wanted a bow that was bendy in the handle to help distribute some of the limb stresses. What has yet to be defined is how much is it going to bend in the handle. I was thinking if the handle got too bendy, I'd put a flat spot in the handle with the bench sander and glue on another hunk of osage for added strength. Then again I'm not sure how much I want too push my luck with this bow.  

Chris,
Yep she already has double nocks and the sinew is thicker on the back side of that limb, thus its desire to want to twist. I'm going to be sanding some but am afraid I'll still be needing to add a touch of sinew to the twisting side of the limb tip. I think I may have missed a spot with a couple courses of sinew there's that much visual differance between the sinew thickness of those two edges. If you know what I mean.

George,
You know I did the angle grinding on that osage in the basement bathroom and with both doors closed. It wasn't my fault the construction crew that built our house didn't make that room air tight like it should have been to begin with  :)   So it's their fault our house took on a unique shade of yellow on the inside. I liked it but since ma didn't so I had to vacuum it up. Man, there's no satisfying her   :bigsmyl:  Tell you what, I'll keep my Saturdays open for the next few weeks and when it works out give me a shout and we'll make a day of it.

Cooter  

PS No more banana bow insight till this twist has been corrected. I will keep everyone updated if the's going to need some more sinew
Title: Re: How to tiller a banana bow
Post by: cooter on February 09, 2004, 07:56:00 PM
He he, I wrestled this bow for a couple hours after work tonight and for the time being persueded her to give up her twist. As Chris suggested, I sanded the sinew with some 80 grit sandpaper on the stong side. I'll be flexing her on the floor and on my tillering tree contraption with the bricks so I can watch that limb bend and look for twisting in the opposite direction. Hope I haven't over corrected the twist and she starts twisting the opposite direction now.

BTW, out of curiosity what does the lightest bow weigh that you own and what is its draw weight? Right now this bow weighs in at 420gram or roughly 14.4 ounces. Man, I hope this bow survives to fling some arrows and doesn't develop compression fractures.

Thanks again everyone for your support,
Cooter
Title: Re: How to tiller a banana bow
Post by: Ralph Renfro on February 09, 2004, 11:42:00 PM
Cooter, what is the thickness of the sinew and the thickness of the limbs?  Normally I wouldn't worry bout compression with Bodark for a core, but if you overpower the Core with too much sinew, you could have problems.  :saywhat:
Title: Re: How to tiller a banana bow
Post by: cooter on February 10, 2004, 05:10:00 PM
Jason,
With regards to that sweatshirt, it's good karma where do you think the best sinew comes from? a Bison or a Souix  :bigsmyl:  We won't ask how many national football championships the Souix won when I was in attendance between '83 and '86.

Ralph,
 
In the fade area the sinew is between 4-5mm while the wood is around 12-14, at the tips the sinew is 2-3mm while thw wood is 10-12mm. Don't know if that will help anyone answer my compression issue question of a post or two ago.

Well, here's another pic for those that are interested. I wanted to keep the limbs as horizontal as possible when my 6 yr old took the picture. They were pretty close. Anyway from the pic, at least to myself the tiller looks as even as I could get it for now. What do you think? and please no BS give it to me as you see it if you see something I don't. I need as much help as I can get with this baby.

Thanks,
Cooter


 (http://www.ozbow.net/phpbb2/album_pic.php?pic_id=271)
Title: Re: How to tiller a banana bow
Post by: LoneWolf on February 10, 2004, 05:47:00 PM
Looks like it is coming down good a traight.  You have more guts than I man, I woul dhave sanded the sides flat and made a boomerang out of that one.  That and I have to dust all the yellow off outside, wife doesn't even want to see it in the house.
Keep up the good work man
Title: Re: How to tiller a banana bow
Post by: Hackbow on February 10, 2004, 06:36:00 PM
Cooter.....you're taking this further than most would dare. Congrats on getting this far and thanks for sharing it all with us.   :thumbsup:  

The only thing I could even think to point out to you is on both limbs, 10-12" in from the nocks it looks like a POSSIBILITY of early hinge development. On the left limb it right about where the stave crosses in front of the little Christmas tree and on the right limb it's just to the right of the moose lamp. It seems to me that if you don't keep the whole limb working perfectly together, that any weaker area will want to let go when you start a serious draw.

I have no experience with anything even resembling this, so take it for what it's worth. Good Luck!!!
Title: Re: How to tiller a banana bow
Post by: the Ferret on February 10, 2004, 06:52:00 PM
...On the left limb it right about where the stave crosses in front of the little Christmas tree and on the right limb it's just to the right of the moose lamp... (Hackbow)

Don't hear that on this forum very often    :bigsmyl:
Title: Re: How to tiller a banana bow
Post by: cooter on February 10, 2004, 09:16:00 PM
Hackbow,

Thanks for pointing that out. I took a closer look at that last pic and your right, it does look like the begining of a pair a hinge's. I'll take that into consideration tomarrow when I do some more scraping. With luck maybe I'll them limbs bending in the right direction  "[laffsmyl]"  

Thanks again for pointing those two spots out to me,
Cooter
Title: Re: How to tiller a banana bow
Post by: cooter on February 11, 2004, 04:18:00 PM
He's my most recent pic. She's starting to turn now, please cratique the tiller so far. Left limb is the bottom limb while the right limb is the top limb as your looking at the picture. Is it me or does the bottom limb look stiff from the handle to maybe midlimb with maybe a small hinge forming in that limb in the center of the far left X-mas tree? BTW, its time to start tightening up that tillering string or she will end up whip tillered I beleive.

Please if you read this give me some input,

Thanks,
Cooter
  (http://www.ozbow.net/phpbb2/album_pic.php?pic_id=279)
Title: Re: How to tiller a banana bow
Post by: the Ferret on February 11, 2004, 04:34:00 PM
Dang Cooter your whipping it's butt boy! I'm not so sure that it's stiff on the left coming out of the handle as much as it is weak on the right. Regardless you are going to have to weaken the left to keep them together. Keep an eye on that. Actually considering what you started with you are doing wonderfully.
Title: Re: How to tiller a banana bow
Post by: Chris R on February 11, 2004, 05:40:00 PM
Looking great  :thumbsup:    I'd go with what Ferret said.  Be careful when she comes around, she'll come quick.  I've got to hand it to you, I'd have thrown it in the "I"ll get back to it" pile a long time ago.

Chris
Title: Re: How to tiller a banana bow
Post by: DCM on February 11, 2004, 06:11:00 PM
Looks excellent Cooter.  How much weight to get that deflection?

Very minor stuff at this point but it looks soft at the red mark and flat at the green.

Looks like the nocks are flipped up a little?

 http://home.midsouth.rr.com/ddmims/sb.JPG
Title: Re: How to tiller a banana bow
Post by: cooter on February 11, 2004, 07:58:00 PM
Thanks for the help guys. I realy appreciate it.

DCM,
Your right those tips are flipped up. The first time I sinewed this bow(third time now) I wanted to make a static recurve so I put 3" of both tips into maybe an inch or so of recurving. Now with out realizing how much reflex this thing was going to take I'm not to sure that I'm glad I did that. Oh well, Too late now to worry about that. Anyway, when I put the sinew on I did a sinew wrap at those bends to be sure the sinew stays put.

BTY I'm not sure how much weight brought the tips to that possition. however, I got three bricks on the tillering string(21lbs) plus I'm pushing down fairly hard. If I had to guess I'd say around 40 lbs. I'm am planning to tighten that tillering string up some later tonight and might see if I can some how manage to get it on a scale. Might be hard to do without having her flip on me. Beleive me guys when I tell you I know what this might be like. The second time this had sinew on it had maybe 6 inches of reflex ans she wanted to flip worse than a fish out of water.

I'll post another pic later tonight with maybe a draw weight, if I'm lucky   :bigsmyl:  

Cooter
Title: Re: How to tiller a banana bow
Post by: Madpigslayer on February 11, 2004, 08:04:00 PM
Good Luck! I think you win a prize if you can stay on er for 8 seconds.  :D
Title: Re: How to tiller a banana bow
Post by: cooter on February 11, 2004, 08:24:00 PM
DCM,

Sorry, I was slightly off on the weight. I used a bathroom scale and a short hunk of 2X4 to check the weight. I balanced the bow on the 2X4 and attempted to push both tips down with equal pressure. To get the limbs to roughly horizontal brought the scale to 50lbs. So now, I guess I'll try to target a finished bow in the neighborhood of 60#@28".

Mickey,
And you thought I'd be flying blind on working her to weight(so did I but lets not tell anyone). I might not be able to check her using a string and pulling the bow down so I might as well balancer her on her handle and push the tips down instead  :bigsmyl:    

Cooter
Title: Re: How to tiller a banana bow
Post by: Hackbow on February 11, 2004, 11:25:00 PM
Looks great Cooter! I think you handled those potential hinge areas great. In this most recent pic, it even looks like those spots may "bump" out just a little on the back, which could have falsely pronounced the appearance earlier.

Isn't it about time you put on the helmet and safety goggles?  :knothead:  

Cal....I liked the "8 seconds" comment!!!  "[laffsmyl]"
Title: Re: How to tiller a banana bow
Post by: Marc on February 12, 2004, 07:09:00 AM
Sorry Cooter. Wasn't on very much in the last few days and didn't see your post.

This is what I do to start off with, I know it's a bit late but what else is new  :) .

 (http://marc.stoneflake.net/Bows%202/Build%20Along/16.jpg)

With the clamped in my vise I grab the tips and bend them by hand  to work the wood and see how they are bending. Then still using my vise I use my long string and T stick like this until I get it up to brace height.

 (http://marc.stoneflake.net/Bows%202/Build%20Along/17.jpg)

Looks like you have already jumped that hurdle though.

I then use this device, that I built especially for highly reflexed bows, to brace the bow.

 (http://marc.stoneflake.net/Bows%202/Build%20Along/18.jpg)

Once the bow is braced it gets a lot easier.
Title: Re: How to tiller a banana bow
Post by: cooter on February 12, 2004, 03:46:00 PM
Dang Marc,

I should have told you to go a head and start the build along then jumped in. I like those forms you've got and wish I had a set up like that. guess I'll just have to make due with what I've got and improvise when in doubt.

I think I've got the tiller straightened out. But got to tell you the 'ol rectal spyncter is sure pickering tighter than a snare drum when I took this next pic. She started to snap, crackle, and pop pretty good and being so close and all. Lets just say I don't want to catch a limb if she goes south. Especially after catching a limb across the nose when she flipped on me the first time I put her on the tillering tree.

Again all comments and insights are greatly appreciated.

Thanks,
Cooter

 (http://www.ozbow.net/phpbb2/album_pic.php?pic_id=282)
Title: Re: How to tiller a banana bow
Post by: cooter on February 12, 2004, 04:07:00 PM
Upon furthor review of that last pic I think the tips are hitting nearly the same plane but the left limb is starting for form a nice arc while the right limb is nor flat. I'm going to need to correct that be for continuing on with the process. I will be trying to get a short sting on her now. Giddy up and start the stop watch. Any wagers how long I'll ride her before being bucked off   :bigsmyl:  

Cooter
Title: Re: How to tiller a banana bow
Post by: John Scifres on February 12, 2004, 04:24:00 PM
Wow Cooter.  You have done a great job so far.  You've almost inpired me to get on the horse that bucked me a couple years ago.  It had 8" of reflex and I about killed myself floor tillering it.  Threw her way back in the pile.  Found her last night.

Watch out for going too fast.  These reflex bows can fool ya.  I think midlimb on both needs to bend a bit.  Keep at ti.  Get a string on her as soon as possible.  Then it's as easy as fallin' off a horse.  Oops, bad analogy.   :)

John
Title: Re: How to tiller a banana bow
Post by: Chris R on February 12, 2004, 04:27:00 PM
Lookin real good.  I think you're ring about the right limb.

Bet that sucker is gonna shoot an arrow with some serious thump  :thumbsup:  

Chris
Title: Re: How to tiller a banana bow
Post by: cooter on February 12, 2004, 06:49:00 PM
I got some good news and some bad news. The good news first, the bows fine for the most part. The bad news is I hog tied her with a short tillering string and the tiller's way off and in the process one of the loops in my tillering string slipped from the nock and the limb caught me across the side of the head. I don't think she liked the way I've been man handling her. No pictures until I get rid of this double vission. Wow she kicks hard   :help:  She's going back in her room for the night or until she learns to behave I think. Wow I'm soar.

Cooter
Title: Re: How to tiller a banana bow
Post by: Chris Wilson on February 12, 2004, 06:56:00 PM
Can you say OUCH!  Been there and had that happen once or twice.  Luckily, mama always said I had a hard head   :D  .  Stringing a highly reflexed bow like that can be a real adventure.  Thank goodness you only got a knot on the head.
Title: Re: How to tiller a banana bow
Post by: Raven on February 12, 2004, 07:06:00 PM
Just put her in front of the fire and let her see what could happen if she trys that again  "[tunglaff]"  Man I bet that made a lump  :eek:   Good luck and be SAFE......Raven
Title: Re: How to tiller a banana bow
Post by: Marc on February 12, 2004, 07:07:00 PM
Cooter. You're best off to tiller the bow with the long string until you get a half decent brace height to her. High reflex bows put so much strain on a string that you pretty well need a steel cable, which is actually what I use  :) . I tiller till I can brace a bow to at least 4" of brace height before switching to a short string.
Title: Re: How to tiller a banana bow
Post by: horseapple on February 12, 2004, 07:28:00 PM
Why does that not suprise me  :bigsmyl:  atleast you have a hard head...

JD
Title: Re: How to tiller a banana bow
Post by: rocdoc on February 12, 2004, 08:41:00 PM
Cooter...JD told me to catch up on this thread. I can sympathize with you. I was working a BBO R-D on my tillering stick this evening and had the tillering string break.  I did a nose dive into the stick and am sporting butterfly bandages on my nose and forehead.....decided to resign myself to twisting up strings tonight ;-)
Title: Re: How to tiller a banana bow
Post by: ks chas on February 12, 2004, 10:08:00 PM
Cooter you had me  just about ready to get that one back out that I started 3 years ago at MOJAM. Then you made your last post and I rembered why I havent finised it.It sure is fun watching you work this thing out. Your doing great. Charlie
Title: Re: How to tiller a banana bow
Post by: the Ferret on February 12, 2004, 10:44:00 PM
Sorry Cooter..no score unless you stay on the full 8 seconds. Better luck next time cowboy   :(
Title: Re: How to tiller a banana bow
Post by: Hackbow on February 12, 2004, 11:35:00 PM
Daggonnit Cooter! It's one thing to make yella dust on the floor.......you can sweep that up for the most part. But if you go to bleedin' all over, then Mrs. Cooter may not let you play with the rest of us. Glad you're alright ...........BE CAREFUL!  :saywhat:
Title: Re: How to tiller a banana bow
Post by: Chris R on February 12, 2004, 11:40:00 PM
Sorry about your head, that wasn't what I meant when I said thump though    :rolleyes:      I got smacked once when I was using a tillering stick on a hickory backed osage when my glue joint failed.  Kinda makes you gunshy.  Cowboy-up    :thumbsup:    

Chris
Title: Re: How to tiller a banana bow
Post by: cooter on February 13, 2004, 06:58:00 AM
Thanks for the words of encouragement. Its greatly appreciated. No blood letting this time but I think I put a pretty good knot on that bows limb  :knothead:  

Marc,
I think I'll heed your advice and lengthen out this tillering string for a little while longer. With the long string how do you prevent the bow from becoming whip tillered? Whenever I've used one the bow always seem to come out whip tillered so I try to throw a short string them ASAP. I guess you could say I learned the hard way that thinking might not be appropriet with these kind of bows.

Thanks again guys for all the help,
Cooter

PS I'll be climbing back into the ring after work tonight and will try to post a pic or two after I get this tiller straightened out.
Title: Re: How to tiller a banana bow
Post by: Marc on February 13, 2004, 07:03:00 AM
Just leave the outer 1/3 of the limbs a bit stiff. I also like to get a short string on a bow as fast as possible.
Title: Re: How to tiller a banana bow
Post by: cooter on February 13, 2004, 05:35:00 PM
I'm in tears. Here is a pic of the bow after getting the tiller straighted out and attempting to get her to bend some more before attempting to get a short string on her. If you look close at the board I have attached to my tillering tree I got 3 lines that I use for tip referance when tillering. I had the tips flexing to the second line down with the lone string when I heard a loud pop. I was hoping it was just the hide glue popping but knew in my heart it wasn't. I closed my eyes and let go of the rope I use for tillering. the limbs were no where near where they were before I began. I unclamped the bow grabbed the sinew and pealed it from the back to where I have the tips sinew wrapped.

this thread is all yours now Marc, Or maybe you want to start your own how to thread on how it should be done.

Cooter

  (http://www.ozbow.net/phpbb2/album_pic.php?pic_id=286)
Title: Re: How to tiller a banana bow
Post by: Tedd on February 13, 2004, 06:09:00 PM
Aw bummer! Sorry to hear it. Get yourself a beer, prop your feet up. It was a good try.  Tedd
Title: Re: How to tiller a banana bow
Post by: Dano on February 13, 2004, 06:31:00 PM
I feel for ya Eric, you put a ton of work into that puppy. Those that don't try never get any where.  :thumbsup:
Title: Re: How to tiller a banana bow
Post by: Madpigslayer on February 13, 2004, 06:43:00 PM
tough luck cooter. here is the thing. ya cant quit. sinew that turkey back up. I wanna see it shootin at Mojam.  :)  

Hey, no guts no glory!
Title: Re: How to tiller a banana bow
Post by: cooter on February 13, 2004, 07:03:00 PM
I'm depressed right now but I'm not giving up. As I'm typing the sinew wrapped tips are soaking in wet wash clothes so I can strip off the sinew wraps. Once I've got the sinew completely off I'll re-prep the back of this thing and try to get her ready for another sinew job. Last Monday I orders some 20 inch moose sinew that should have been her today but didn't arive. I'm keeping my fingers crossed that it will get her tomarrow so I can start pounding it and maybe start applying sinew to this bow come Monday. I think I'm just going to put one or two courses on the bow next time and leave it at that. I wont be preloading her, so with a little luck might only have to deal with 4-6 inches of reflex. That should be a breeze compaired to what I was dealing with before. Hey, it just dawned on me, if this bow would have had a flat profile with how much I had the limbs bending I probably would be shooting her now. after all I had the tips moving roughly 20 inches from their resting position.

A person just has to look at the bright side from time to time  :bigsmyl:  
Cooter
Title: Re: How to tiller a banana bow
Post by: cooter on February 13, 2004, 07:13:00 PM
UPS man just stopped by, Any guesses what I'll be doing tonight?   :help:  

Cooter
Title: Re: How to tiller a banana bow
Post by: Linc on February 13, 2004, 07:25:00 PM
Cooter, You sure are persistent.Good for you.Never say die.
Title: Re: How to tiller a banana bow
Post by: Dano on February 13, 2004, 07:29:00 PM
We're with ya Cooter, pound that sinew boy.   :thumbsup:
Title: Re: How to tiller a banana bow
Post by: Chris R on February 13, 2004, 07:43:00 PM
Tough luck man.  Keep at her.  :thumbsup:  

Chris
Title: Re: How to tiller a banana bow
Post by: the Ferret on February 13, 2004, 07:46:00 PM
Oh man, that cowboy done crippled the bull    :scared:  

Remember what Bro Randy said Cooter..."it ain't broke till I say it's broke"     :mad:
Title: Re: How to tiller a banana bow
Post by: Hackbow on February 13, 2004, 07:47:00 PM
Wish I was there to pound for you. I am definitely gonna use this project as an illustration for my kids. There is a reward waiting at the end of this effort and I'm glad you're not throwing in the towel Cooter.
Title: Re: How to tiller a banana bow
Post by: Marc on February 13, 2004, 08:10:00 PM
Hmmm. You know Cooter. I had something similar to that happen to me a few years ago. Part of the sinew lifted clean off half one limb. The rest of the bow was fine. Know what I did? Pulled out some Epoxy and glued that sucker back together. Worked just fine, no difference between it and the other limb.
Title: Re: How to tiller a banana bow
Post by: Flinttim on February 13, 2004, 09:15:00 PM
Gosh Eric, wished I had caught this thread earlier. I had all the sinew pop off a hickory bow last year. One piece. I think the hickory was too dry and sucked the moisture out of the sinew causing a bad bond. I cleaned the wood, and then wetted it with a spray bottle, and then reflexed it till the sinew would line back up and then re-glued the whole pc back on with hide glue. Wraped it tight with elastic and let her dry a month and a half. Came out fine and still shoots.
Title: Re: How to tiller a banana bow
Post by: John Scifres on February 13, 2004, 09:48:00 PM
Cooter,

Dang boy!  I admire your persisitence.  What ever happened to that Cooter Skin of yours?  At least you just glue it down.  No stripping  :)   You'll love that moose sinew.  It is 3 times easier than deer sinew.
Title: Re: How to tiller a banana bow
Post by: Timo on February 13, 2004, 09:58:00 PM
Been there  Cooter! I feel for ya.

I think it was Winston Churchill that said,

"Success is the ability to go from one failure to another,with no loss of enthusiasm"

That's got Cooter all over it!Keep trying boy!  :thumbsup:
Title: Re: How to tiller a banana bow
Post by: cooter on February 13, 2004, 09:59:00 PM
Time out and hold the phone, am I hearing this right? I might be able to glue the sinew back on to the bows back? The sinew is in one piece from tip wrap to tip wrap. I pulled the wet wash clothes of the tips and can let them dry out. They haven't softened up too much and haven't started unraveling yet so once dry I think they'll be fine. Please give me precise instructions on how you'd attempt it and I'll give it a go. Think epoxy would be the best route or should I heat up hide glue that I size the back with then size the under side of the sinew then wrap the bow up and let her sit for a month or so? or should I go with a 30, 60, or 90 minute epoxy and be done with it.

As the saying goes, " the shows not over till the fat lady sings" and I haven't heard her sing yet  :bigsmyl:  

  :help:  
Cooter
Title: Re: How to tiller a banana bow
Post by: Flinttim on February 14, 2004, 06:22:00 AM
No guarantees but here is what I done. Obviously the sinew is glued together well, so why not use it ? The bad bond was between the sinew and the wood. I scrubbed the wood with steel wool and acetone, scraping off the big hunks of glue. Let that dry well. Then I scraped the whole bow with a section of saw blade, really ruffing up the surface. I then wet the bow with a spary bottle of warm water, just a light misting. Let it soak in a while. While it is, mix up some glue. Use whatever you used on the sinew the first time. Make sure it's mixed right. I use a small pack of Knox in 1/4 cup of water and nuke it for 20 sec in the microwave. Your micro may be different just don't let it foam up. Now reflex the bow until it will mate up with the sinew . I tied mine down in the middle of the handle with twine and put wood blocks under the tips till it lined up. Once that is done sze the bow wood with hide glue. Just brush on a light coat end to end and let it tack up. Now bbrush on a thick coat of glue on the bow wood and the sinew. Make it heavy. Now line the two up and pinch them together in a few places with spring clamps, while you get busy wrapping with elastic. Ace type bandage from the Dollar Store works well. You might want to put a pc of wax paper over the sinew to save the elastic from sticking too much. As you do this you will see glue oozing up thru cracks and voids and holes in the sinew. GOOD ! This fills them but more importantly creates a good bond. Wrap it up and put it away for about a month and a half. (you can remove the wrapping in a couple of days) But don't screw with the bow for a month and a half. You've introduced a lot of water to the wood and it needs to dry out before handling. During that time if you see any edges that need attending you can work some glue up under them and rub them down while the glue dries.

Worked for me on a 50" hickory Modoc/Hupa type bow. 50# @ 26"
Title: Re: How to tiller a banana bow
Post by: Marc on February 14, 2004, 06:41:00 AM
Cooter
As Tim says. The sinew is already glued up. It will be like gluing a backing on wood.

Unless you are sure of getting a good fit then I would go with the Epoxy. In fact hide glue may give you fits since it will gell before you can lay the backing back down. If you had some liquid hide glue or some Fish glue then you may have better success since it will give you a longer work time to get things aligned. In any case make sure you prep the wood well, score then degrease.
Title: Re: How to tiller a banana bow
Post by: gifford on February 14, 2004, 09:04:00 AM
Cooter; bummer, man. But the cooter-can-do attitude is great. Keep after it.

Marc-never thought of epoxy when mine came loose in a similar manner. That is a good tip, thanks for sharing it.
Title: Re: How to tiller a banana bow
Post by: cooter on February 14, 2004, 09:32:00 AM
Thanks guy's, I'll give that a try. Let me throw this out for comment. Ok, let say the back of the bow has had a hack saw blade dragged across it and has been degreased and everything is ready to go. Would it make some sense to take hot water(almost boiling) and with a towel dab it into the bow woods while trying to keep the sinew dry. This might help get the grain in the wood to raise on the bows back for a better bond between the bow and sinew. Then follow Tims advice on the application of the hide glue and bow wrapping? would it make some sense to use slightly hotter hide glue than what I used when apply the sinew the first time around? Again this might help in getting the hide glue to drawn into the sinew and further raise the grain in the wood for a better bond.

Lets just say I want to get all my ducks in a row before proceeding. if you know what I mean,

Thanks for the help,
Cooter
Title: Re: How to tiller a banana bow
Post by: Marc on February 14, 2004, 09:47:00 AM
Cooter
When I degrease an Oily wood such as Osage I use Lye and rinse with warm water for the very reason that you mention, it raises the grain of the wood. Something else is don't forget to degrease the underside of the sinew as it may have some oils from the Osage on it. I see no advantage in using hotter glue, you may want to use a thicker glue though. Once the backing is glued down and wrapped up you could warm the whole bow up to get the hide glue to re-liquify and get a proper bond.
Title: Re: How to tiller a banana bow
Post by: lcoast on February 14, 2004, 09:49:00 AM
Cooter this has been quite the ride.

I would suggest not raising any wood to apply glue to. Glue works best on a solid smooth clean surface. Wood workers make their surfaces like glass. The story in TBB about applying hide glue to glass and it lifting pieces of glass when it dries is real. Raised wood is weak wood.

=keith=
Title: Re: How to tiller a banana bow
Post by: Marc on February 14, 2004, 10:08:00 AM
Good point Keith. I don't think it applies in this case though because any water will raise the grain on wood and hide glue is full of water  :) .
Title: Re: How to tiller a banana bow
Post by: cooter on February 14, 2004, 10:43:00 AM
Keith, Marc,

I guess thats one thing I don't get with this bow. Before sinewing I've scrubbed the back with a strong lye solution that I made at work 3 times of which water was used between each washing then 3 washings using acetone. I like abraiding the two surfaces when I do a glue up. IMO, that should increase the actual surface area for the glue to bond to which should actually give a stronger glue joint than two smooth as glass surfaces being glued together.

I just might use the hot gun to slightly heat the wood and sinew once I've got the bow wrapped and tied in place. Don't worry I wont heat it like I would for bending. just enought to get both surfaces warm to the touch.

Thanks again for the help,
Cooter
Title: Re: How to tiller a banana bow
Post by: DCM on February 14, 2004, 04:12:00 PM
No heat gun.

I had a sinew backing peel off while it was curing.  Prep the bow again, with the hacksaw treatment.  I'm not sure the lye wash is as important if you get down to clean wood and score it up good.  Steam the bow good before you start to get it nice and warm.  Make sure you get any extra glue off the sinew.  Bath it in hot water until it gets just soft enough to be limber.  Size the bow well with good glue (Knox works for me) the proper temperature (not more than 120).  I like to mix if fairly thick, like hotcake syrup.  Size the sinew well and put them back together.  Wrap tightly with an ACE bandage and give it a few days to set.  If you'll lay off that maximum reflex gig you'll be fine.  If you go for 10" of reflex you are asking a lot of the material and design.

Did a lot of sinew stay with the bow or was it a clean separation?

Bummer dude.  Persevere.
Title: Re: How to tiller a banana bow
Post by: the Ferret on February 14, 2004, 05:09:00 PM
Keith, I don't know that I agree with gluing smooth surfaces together. Hydraulic lock comes to mind as does hydroplaning, as does trying to get 2 surfaces with smooth on glue to stay lined up properly   :D  . I can also cite plenty of instances where guys didn't rough up a glued up handle and it popped where by they roughed them up and the handles held. I believe that is the reason they invented toothing planes in the first place.
Title: Re: How to tiller a banana bow
Post by: Flinttim on February 14, 2004, 05:53:00 PM
Yep , toothing planes do two things, increase surface area being glued and prevent glue starvation. Starvation is not a deal here but increased surface is. Doubtful you could use a toothing plane here w/o screwing up the bow back so the hacksaw blade fills in.

Thick glue and lots of it, and hide glue.We're talking about bonding wood to protein here. I can't say epoxy wouldn't do that but I know hide glue will.If it's good enough to lam wood to horn (as in composite bows) it's more than adequate for this application.

And as David said , keep the heat gun away from it. Heat is the enemy of sinew.
Title: Re: How to tiller a banana bow
Post by: Marc on February 14, 2004, 06:20:00 PM
David and Tim. I've used a heat gun on a sinew backed bow before, more than once in fact. As long as the sinew doesn't get hot to the touch it's not affected, this of course is on cured sinew.

Cooter. You say that you roughed up the back before sinewing. That could be the problem. You should rough up the back then degrease. Doing it the other way just exposes oily wood.
Title: Re: How to tiller a banana bow
Post by: cooter on February 14, 2004, 07:11:00 PM
Only got a couple minutes, No Abraid the back then degrease with lye/water followed by some acetone then once dry look at the abraiding and if I think it needs more repeat the process until I like the feal of the back. I don't like too smooth of mating surfaces when I do a glue up.
Then wrap in cotton gauze. With this bow I think I'l wrap it from handle to one tip then handle to second tip. I've been working on it off and on throughout the with some pic's that I'll post later tonight or in the morning.

Cooter
Title: Re: How to tiller a banana bow
Post by: Timo on February 14, 2004, 07:21:00 PM
I agree with Marc on the "rough up First,then degrease"!I see no need for acetone after the lye bath?Lye will get it clean,plenty of hot water rinse of course!

The toothing plane will work, just take the plane out of the  body, and use it as a scraper.Hacksaw blade will also suffice.
Title: Re: How to tiller a banana bow
Post by: cooter on February 15, 2004, 07:37:00 AM
As promised some pic's. All I've got to say is and if you want to quote me feel free.
Things just keep getting better and better   :bigsmyl:  
Cooter
Title: Re: How to tiller a banana bow
Post by: Flinttim on February 15, 2004, 08:06:00 AM
You are on the right path Cooter. Something I do and you might want to do, is to wrap some sinew around the bow in the middle of and thru the handle area. Gives that little bit of insurance from lifting and separating in the middle (sounds like a bra commercial). That severe reflex scares me though, but I guess you can't do much about it. Rusty is the master of the severe sinew reflex and hopefully he'll be back here by the time the sinew dries.
Title: Re: How to tiller a banana bow
Post by: cooter on February 15, 2004, 10:44:00 AM
Flinttim,

Ya, I was hopping the 'Ol Coot an his side kick(or should that be the other way around) sorry,  brain fart. Anyway wish they would have chimed in here, shaking their heads in dis beleif, and offered up a few words of wisdom to this Square headed yankee from Minnesota  :bigsmyl:  Such as maybe, burn her.

I got one small gap that needs filling with hide glue and re wrapping. By the time I got through with her last night my fingers were numb. My hands are still soar this morning. If I was smart I think I'd have tried to do one limb at a time.

Talk to you later,
Cooter
Title: Re: How to tiller a banana bow
Post by: cooter on February 15, 2004, 11:08:00 PM
I'm bound and determined to make myself a sinew backed hunk of osage. Just got the first course of Moose Sinew on. This one might have a tiller that's slightly more acheivable compaired to that last one I attempted. And you haven't seen the last of that bow either  :bigsmyl:  
 
  (http://www.ozbow.net/phpbb2/album_pic.php?pic_id=302)

I think I'm in love with Moose Sinew. This might sound strange, weard, or right out of the
Twilight Zone, but everything from pounding, pulling, soaking, and applying this sinew gave me a sense of good carma, if you know what I mean it.

Take care all,
Cooter
Title: Re: How to tiller a banana bow
Post by: the Ferret on February 16, 2004, 07:58:00 AM
Cooter that one looks like it may actually make a bow. Would look awesome with some brush nocks.

What are all the little lines on the side of the bow, is that wrapped?
Title: Re: How to tiller a banana bow
Post by: John Scifres on February 16, 2004, 09:08:00 AM
Cooter,

Moose sinew is awesome. I like it so much more than deer.  It is actually fun to do.  I had the kids stripping sinew yesterday.  My 8 year old was doing QA/QC on my work making sure the strands were thin enough.  I sinewed a bow with it last night.  Took about 1.5 hours and just a bit more than 1 tendon.  It already looks great this morning.  I'm sure it will be really pretty just because it's so long and less chopped up on the back.

John
Title: Re: How to tiller a banana bow
Post by: cooter on February 16, 2004, 12:33:00 PM
Mickey,

Yup, the bow's wrapped. Say, I thought you said you had some moose sinew in some thread a while back. That's why I'm using it. If you've never tried it, give it a go, awsome stuff. Brush nock's? you wouldn't by chance have a picture?

John,

I wanted to built up midlimb(thanks Rusty for the advice) with some short pieces. I soak what I swear were bundles maybe 6 inches in length dry. However, most went on wet maybe 12-16 inches. I know the one was close to 20+ because I centered it on the handle and layed it nearly midlimb to midlimb. Now I'll keep my fingers crossed that I don't end up with another bananas. Is it me, or does this moose sinew cure clear?

Cooter
Title: Re: How to tiller a banana bow
Post by: Marc on February 16, 2004, 01:42:00 PM
One Moose backstrap from an adult Moose is big enough to do a whole bow, it's long enough to do one whole limb of an average length bow from handle to tip. I find that Moose tendons are tougher to seperate and you really have to pound the H out of them, they dry a golden color for me.
Title: Re: How to tiller a banana bow
Post by: George Tsoukalas on February 16, 2004, 04:11:00 PM
Cooter, I admire your persistence.  :)
Jawge
Title: Re: How to tiller a banana bow
Post by: cooter on February 16, 2004, 06:33:00 PM
Jawge,

I'm going with shear statistics and probability here. Maybe throw in a little stuborness and a touch of pigheadedness into the equation as well. Anyway, you could go as far as saying it's become an absession. I will make a sinew backed osage arra flinger in my lifetime and thats all there is to it.  "[tunglaff]"  

Cooter
Title: Re: How to tiller a banana bow
Post by: George Tsoukalas on February 16, 2004, 07:19:00 PM
Get you on a rope and pulley tho, Cooter, so you don't spend too much bowyerin' time in the ER. been readin' your trials and tribulations.  :)
Jawge
Title: Re: How to tiller a banana bow
Post by: cooter on February 16, 2004, 08:33:00 PM
Jawge, Your looking through the wrong lenses in them trifocals again  "[tunglaff]"  

The bow and form in the last picture is setting on my tillering tree. Works slick, set a level where I clamp the handle, then set the level on the board with lines, Clamp the bow in place, attach the tillering string, and usually sand back 4-10 feet to work the limbs depending on where I'm at in the process. I find myself standing further away when early tillering and closer to the bow when final tilling.

Cooter
Title: Re: How to tiller a banana bow
Post by: George Tsoukalas on February 16, 2004, 08:49:00 PM
Naw. Those are rose colored glasses, Cooter. Good stay safe, my friend.
jawge