Author Topic: BBI build along, my first backed bow (Read 13104 times)

Echatham · « **Reply #20 on:** March 02, 2013, 03:05:00 PM »

alright, what do you guys think about color combo.... osage or maple for the power lam?

Echatham · « **Reply #21 on:** March 02, 2013, 03:07:00 PM »

too late i already picked maple!

making the power lam 3 inches longer than ther riser

Echatham · « **Reply #22 on:** March 02, 2013, 03:12:00 PM »

here is the method i devised for tapering the power lam, BTW i made it 3 inches longer than the riser. first I trued up the table on the disc sander with a square, then i trued up a piece of 2x4 with the newly square table and sander. then i clamped one end of the 2x4 to the table where it was touching the disc at one edge. I clamped the other end 1/8" from the disc, so that when i slid the maple lam in there, it got tapered from 1/8" to nothin over the 8" width of the disc. its a 16" lam. so nice continual taper from one end to the other. then i paper thinned the ends with 120 grit sandpaper.

Echatham · « **Reply #23 on:** March 02, 2013, 03:14:00 PM »

last thing i did last night was glue up the form, side posts are 4 1/2" high, so i can put the riser right on the form for lots of reflex, or build up the center to reduce the amount of reflex. maybe i can get a dry run done tonight so i can see where i need to work on the glue lines. now you guys are all caught up with me, more to come soon!

Troy D. Breeding · « **Reply #24 on:** March 02, 2013, 07:37:00 PM »

Dang,, that's one nice piece of curly maple your using in the riser.

Troy

jsweka · « **Reply #25 on:** March 02, 2013, 08:27:00 PM »

I would have picked maple for the power lam too.

Looks great so far.

Roy from Pa · « **Reply #26 on:** March 02, 2013, 08:31:00 PM »

Your doing very well so far.

D · « **Reply #27 on:** March 02, 2013, 09:15:00 PM »

I woulda picked osage...lolol...Naw considering your riser is maple I woulda picked the maple too. Thats a great piece of curly too. Looks great so far.

Echatham · « **Reply #28 on:** March 02, 2013, 09:36:00 PM »

any tips on making a tip overlay out of antler? i cut out a 2+" section of tine, and i guess im going to split it down the middle, and flatten it with the sander, but the inside seams very spongy, and the hard part, the shell, isn't very thick, maybe 1/8". never cut up a shed before, didn't really know what i was up against. man that stinks!

Roy from Pa · « **Reply #29 on:** March 02, 2013, 10:20:00 PM »

We need a close up picture of the beer label please.

wood carver 2 · « **Reply #30 on:** March 02, 2013, 10:28:00 PM »

The antler near the tips might be a little more solid. You might have to go with a thin piece and a bit of wood to build up the height. Also, soaking the antler with super glue could help strengthen it a bit.
Dave.

rmorris · « **Reply #31 on:** March 02, 2013, 10:51:00 PM »

Roy, that is a mans beer! More than likely the reason you don't know what it's. it is a Sierra Nevada torpedo IPA.

Echatham · « **Reply #32 on:** March 02, 2013, 11:30:00 PM »

That it is rmorris, that it is

Roy from Pa · « **Reply #33 on:** March 02, 2013, 11:37:00 PM »

Oh one of them fruity beers I see..?

Echatham · « **Reply #34 on:** March 03, 2013, 12:08:00 AM »

hops are fruits.... right? it is very hoppy.

CamoZ · « **Reply #35 on:** March 03, 2013, 11:37:00 AM »

Looking good so far..keep em comin..

Echatham · « **Reply #36 on:** March 03, 2013, 02:50:00 PM »

clamped it all up today just to get a feel for shape and see how all my glue lines look. i really need two more big clamps, i get a slight gap at the center above the riser and between the clamps. do you think it would be benefitial to radias the back of the riser, so that the ipe can deflex around it more naturally? do you get what im saying? I will draw a picture if i need to. anyway what do you all think about this shape?

and with more clamps

Echatham · « **Reply #37 on:** March 03, 2013, 02:57:00 PM »

here is a close up of my biggest glue line gap, this is at the end of my power lam, you can see light. for scale reference the ipe is 3/8" thick

should i work on that some more? or is that really no problem at all? im using unibond 800, the replacement for urac 185 if that helps, im not sure on that glue's gap filling properties.

Roy from Pa · « **Reply #38 on:** March 03, 2013, 03:09:00 PM »

Here is how you need to do it. The setup you show will prolly come out with very little reflex. And your center block is way too long. You want clamps every two inches and you want to back the boo side at glue up or else the clamps will indent the boo and it will splinter up on you while tillering. You want a smooth even joint without gaps. Unibond800 will be perfect and it has gap filling properties.

Video in link below.

Echatham · « **Reply #39 on:** March 03, 2013, 03:22:00 PM »

Roy is that a bend in the handle bow, or do you glue your riser on separately? I am going to use about twice the clamps on it as are shown in the picture, and my clamps all have rubber pads on them, do i need to pad under them more or should they be fine?

BTW, I know my riser looks massive, and I actually am going to shape it down some more before glue up, well, not shape it, but im going to take at least a half inch off the thickness, and re-grind the fades until the handle portion of the riser is 5" again. I am hoping that this will also serve to make the power lam more effective, by making it 4+" longer than the riser.

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Author Topic: BBI build along, my first backed bow (Read 13104 times)

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