Author Topic: Built my BBI form..didn't work (Read 5110 times)

Echatham · « **Reply #140 on:** May 16, 2013, 11:01:00 AM »

hmmm.... wonder why the tips would be off like that. i hate that it didnt turn out better. might be fine if you can get the tips back in line.

John Scifres · « **Reply #141 on:** May 16, 2013, 11:06:00 AM »

It might be the pic but your 2x6(?) base looks to be a bit twisted. I highly recommend you get Dean Torges' video "Hunting the Bamboo Backed Bow". (bowyersedge.com)

I use strips of innertubes and stretch them as I wrap between clamps set 3-4" apart. Alternate the direction that you wrap to keep forces relatively equal. That makes for real nice glue lines.

It'll be OK. Just keep at it. You didn't really expect your first one to be all that good did you?

WestTexan · « **Reply #142 on:** May 16, 2013, 08:42:00 PM »

I've only glued up a couple HBH bows and what I found on the first one on a trial run is that you need to be sure if your using big heavy C clamps to not put them all on one side it will twist from the weight of the clamps. After my first one I bought a bunch of cheap small clamps. Hope it turns out ok ... I bet you make a Bow out of it.

Zradix · « **Reply #143 on:** May 16, 2013, 09:37:00 PM »

Thanks guys.

One thing I did notice John..
My 2x4 base board flexed from the force of bending the bow.
It seemed to stay straight..left to right..but curved slightly up and down.

Roy from Pa · « **Reply #144 on:** May 16, 2013, 09:40:00 PM »

The 2 x 4 is prolly pine. That's a soft wood. When you clamp down a bow, your form will twist with pine. My form is 1 inch thick oak with 1 inch steel angle iron bolted to each side.
And if you leave your belly wood 1/4 inch wider than your boo, then cut it out after glue up, you will have better glue joints.

Zradix · « **Reply #145 on:** May 16, 2013, 09:40:00 PM »

Thanks for the tips!

!!!!GOOD NEWS!!!!

After cleaning off the boogers and sanding some facets..
my glue lines aren't bad at all!
Just didn't look worth a dirty penny right on the outside.

I'm so %#^^&$& relived I could darn near cry.

there is still hope...

...gonna get back to it..just wanted to share my excitement with some who can understand.

Zradix · « **Reply #146 on:** May 16, 2013, 09:43:00 PM »

Roy..
You're so cool..

My best Bud is 2nd in line at a machine shop.
I'd love to get a steel I-beam with locking rollers for the posts....
Just gotta scrape together the $$$

Zradix · « **Reply #147 on:** May 16, 2013, 09:44:00 PM »

or..just drill a bunch of holes and use bolts...if I gotta do it all normal like..lol

Zradix · « **Reply #148 on:** May 16, 2013, 09:46:00 PM »

maybe even cut some nice 3/4" plywood into 6" wide 8 foot long pcs.
Don't really need 8'..but you get the idea...

Then glue and screw em together..that should make for a tough beam...

Zradix · « **Reply #149 on:** May 16, 2013, 09:48:00 PM »

All I KNOW IS MY PINE 2X4 DOESN'T WORK PERFECT.

Zradix · « **Reply #150 on:** May 16, 2013, 09:50:00 PM »

Have a question guys.

I'm putting horn tips on this one...gonna try to do it like Roy.

Should I put those on before tillering or after?

Thanks!

Echatham · « **Reply #151 on:** May 16, 2013, 10:48:00 PM »

thats strange to me.... i used a regular 2x4... im sure its pine..... and i didnt run into anything like that.... i didnt go for quite as much bend as you did.... but not to much less. glad your glue joints werent bad..... i had the same feeling when i first saw mine out of the form. can you show us a pic of how the limbs are twisted?

Echatham · « **Reply #152 on:** May 16, 2013, 10:50:00 PM »

i put my tips on after i got a couple inches of bend.... and modified them as i went.

Zradix · « **Reply #153 on:** May 16, 2013, 11:10:00 PM »

Thanks Eric.

Here's the best pic I good get.
My camera is almost as bad as my photography skills.

But this one seemed to show "reality" instead of fiction.

The dark spots are a few spots I spread a little SG just to be safe..

Zradix · « **Reply #154 on:** May 16, 2013, 11:12:00 PM »

it's not horrible and I think I can fix it along the way.
I know I've corrected worse on some old f-glass recurves.

I know it's bad enough that I'd be miffed if I paid someone for it..

Echatham · « **Reply #155 on:** May 16, 2013, 11:58:00 PM »

i think you got a better eye than me! i dont see it. is the far tip a whisker right?

Echatham · « **Reply #156 on:** May 17, 2013, 12:01:00 AM »

if thats the case... then u should be able to correct it when you sand down to the line.... thats why you left so much extra right!

Zradix · « **Reply #157 on:** May 17, 2013, 02:30:00 AM »

Yes..it's to the right.
It's hard for me to photograph.
..and..uummm..eh..yeah..that's why I left sooo much extra..just in case this happened..lol
I didn't leave that much but I'm confident I'll be able to get it pretty close if not darn near perfect.

Got kinda dirty tonight..if ya didn't know better you'd think I was working on my truck..lol

I decided that things looked good enough overall to glue this on...
Lots of sanding is where the "dirt" came from..

Bowjunkie · « **Reply #158 on:** May 17, 2013, 04:13:00 AM »

I grind, install, and shape the tips prior to tillerirng. Prior to any tillering, I also establish all facets... limbs, handle, dips, trap the back... faceted end to end.

talkingcabbage · « **Reply #159 on:** May 17, 2013, 05:48:00 AM »

Zradix, did you pretaper the ipe before glue up, or did you leave it the full 3/8" thickness?

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Author Topic: Built my BBI form..didn't work (Read 5110 times)

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