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Offline OffTiller

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question on backing
« on: August 26, 2014, 08:07:17 pm »
Hey guys, i am starting on a hickory backed black walnut flat bow. I have a thin strip of hickory from last bow but it varies in thickness. If i hand plane it even, how perfect does the thickness need to be, and do i need to worry about anything lifting if i use a hand planer. and what can i use to smooth the backing to keep anything from lifting.
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Offline Pat B

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Re: question on backing
« Reply #1 on: August 26, 2014, 08:15:07 pm »
Sanding might be easier if you have a belt sander. If you have to plane it be sure you go with the grain.
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Offline OffTiller

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Re: question on backing
« Reply #2 on: August 26, 2014, 08:20:01 pm »
thanks, and obviously use the sanded side for the glue up?
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Offline DarkSoul

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Re: question on backing
« Reply #3 on: August 26, 2014, 08:20:05 pm »
As long as the backing is quarter sawn or rift sawn, you can sand or plane it even after you've glued it to the walnut. A thin and flexible strip is difficult to reduce by hand. Just make sure you have one flat surface so you can glue it to the belly wood.
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Offline OffTiller

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Re: question on backing
« Reply #4 on: August 26, 2014, 08:23:11 pm »
makes sense, I was thinking 1/8" thickness. should i also trap the backing if using BW? and if so how do i do that with BW?
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Offline Pat B

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Re: question on backing
« Reply #5 on: August 26, 2014, 08:29:09 pm »
You'll want to trap it after glue up too. Then, trap it from back to belly with the belly being wider. You can probably bring each side of each limb in 1/8" or slightly more on the back.
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Make the most of all that comes and the least of all that goes!    Pat Brennan  Brevard, NC

Offline OffTiller

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Re: question on backing
« Reply #6 on: August 26, 2014, 08:30:44 pm »
great, that gives me a great place to start. really grateful to both of you.
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Offline OffTiller

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Re: question on backing
« Reply #7 on: August 27, 2014, 02:25:16 pm »
so i took the clamps off my boards today and on one side of the bow past a fade the glue has shrunk and caused a gap on edge of the boards. to get a better idea, lets say it's the top limb on the right side (as an example) my goal was to do an ALB but if i cant figure out how to fix the gap, i feel i might have to cut this into a pyramid bow and hope the gap doesn't run to the middle of my glue up. any suggestions? thanks.
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Offline bubby

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Re: question on backing
« Reply #8 on: August 27, 2014, 02:41:49 pm »
Heat it up, take the backer off, clean it up and reglue, get some bike innertubes and wrap vs,.clamp
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Offline Pat B

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Re: question on backing
« Reply #9 on: August 27, 2014, 03:44:26 pm »
2x
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Make the most of all that comes and the least of all that goes!    Pat Brennan  Brevard, NC

Offline OffTiller

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Re: question on backing
« Reply #10 on: August 27, 2014, 05:16:27 pm »
so obviously TB3 shrinks as it dries. would another glue be better for backing with woods?
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Offline DarkSoul

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Re: question on backing
« Reply #11 on: August 27, 2014, 05:27:38 pm »
No.
Nothing wrong with titebond 3.
It has just been improperly clamped by you. You need at least 30 clamps to make them work, but a much better technique is to use bike inner tubes as elastic bands.
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Offline OffTiller

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Re: question on backing
« Reply #12 on: August 27, 2014, 05:34:57 pm »
so just cut em' to length and use a square knot? since tighbond need air maybe wrap around every 4-6 inches. would that be enough
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Offline John D

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Re: question on backing
« Reply #13 on: August 27, 2014, 05:43:53 pm »
Your glue up needs even distribution of clamping force more than big gaps for air.  Little gaps between the wraps of bike tubes is enough.  Do a search for bike tube and see how some of the other guys use em.  If I was gluing on a backing that was 1/8" thick, I would leave gaps no bigger than 1/4" in my bike tube wraps.  Hope that helps.  Leave em long and tuck the end and start another.  In my opinion, air will get in there. 

John D.

Boise
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Offline OffTiller

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Re: question on backing
« Reply #14 on: August 27, 2014, 05:58:39 pm »
i have seen those set ups before, just didn't stick and now i'm kicking myself for it, i'm gonna give it another go. thanks.
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