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hornbow twist

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loon:
I've been planning on making a jig for fixing my hornbow's twist..

Will heat from the horn (belly) side, also have an infrared thermometer, may take it up to 48C or so , and then heat the whole bow to 40C?

Should I take a video of the top limb while drawing it to find out where the twist is, and then try to correct it.. it looks like it's mostly the upper 1/3 of the sal/bending limb but begins a bit below the middle of the sal. Should probably try to take picturs/video perfectly frontal as well ...

The top limb's ear is also tracking to the right viewed from the back from when I tried to correct it..

BowEd:
I can see that.Not much though really.It doesnt throw the string off though correct?You got Adam's instructions on that procedure.

loon:

--- Quote from: Beadman on August 22, 2016, 09:51:06 pm ---I can see that.Not much though really.It doesnt throw the string off though correct?You got Adam's instructions on that procedure.

--- End quote ---
Thanks
Yeah it doesn't (almost seems to) but I can tell the siyah is really not in line more easily at brace
Adam Karpowicz? I only saw text about twist correction, no pretty pictures, and I didn't see anything about using special jigs to correct twist or offset. I don't recall if he mentioned that it should be heated from the horn side, which I noticed in Adam Swoboda's book



Sorry about the crappy drawing. This is what I'm planning to do... dowels or pegs in a pine board. Instead of wrapping for the supports, I could put on blocks of wood. but hopefully wrapping would work fine. Was thinking either twisting twine or using a clamp to apply force

mikekeswick:
Forget the jigs!
You can easily correct that twist by hand. Simply heat then over correct and hold there until cool. Then leave it for a few hours before stringing it. Check for twist again and repeat if necessary.
Hornbows just don't lend themselves to jigs and clamping etc.

BowEd:
Yes Adam Karpowicz's book.Heating limb at the twisted area from the horn side not over 50 degrees centigrade.He used little heart blankets at times for more control of temp.Using a heat gun will work too[waving it slowly back and forth] letting the heat slowly penetrate but then I moniter temp with a laser temp gun too.Then like what Mike mentioned over correcting and holding till cool.All by hand.You'll see results.Your almost there and done I'd be patient and don't do anything drastic now.....lol.Look forward to seeing the final bow done.

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