Re-gluing horn
My latest bow devolped a crack in one horn strip and the crack traveled then partially delaminated. So I removed the rest of the horn and would like to replace it.
The more I think about it the more I become worried about either changing the angles of the now thinned/flexible core during clamping or inducing twist when clamping.
Has anybody replaceda horn strip before and if so how exactly did you do it.
It would be a shame to waste this bow as it was looking perfect at brace when the crack started. No twist perfectly even etc...
Please help!
The more I think about it the more I become worried about either changing the angles of the now thinned/flexible core during clamping or inducing twist when clamping.
Has anybody replaceda horn strip before and if so how exactly did you do it.
It would be a shame to waste this bow as it was looking perfect at brace when the crack started. No twist perfectly even etc...
Please help!
I replaced the entire belly on my Scythian bow with no problem but I do not clamp but use inner tube strips for more even pressure. The finished job can then be reheated where necessary for further squeeze out.
I have done that many times, and used clamps :)
You can make a former of wood or plywood to support the sinewed side of the bow arm during the glue-up. Well padded or concave if necessary to make sure the sinew will not be damaged. Volker made a similar repair recently.
Adam
Adam
Thanks for the replies.
I was worried about using the rope method, which is how i've clamped the horn to core on the bows i've done before due to the twisting.
I especially like the idea of making a form to hold the bow straight while gluing. I think this is what i'll do because I have a load of plywood strips that I can laminate together for the form. I don't have enough big clamps to do a whole limb, but enough to get the strip held intially then I might try innertube strips. I use these for making laminated wood bows and they give perfect gluelines with wood laminates. I'll make the strips fairly narrow so I can leave small gaps between the wraps to check squeeze-out of glue etc.
I was worried about using the rope method, which is how i've clamped the horn to core on the bows i've done before due to the twisting.
I especially like the idea of making a form to hold the bow straight while gluing. I think this is what i'll do because I have a load of plywood strips that I can laminate together for the form. I don't have enough big clamps to do a whole limb, but enough to get the strip held intially then I might try innertube strips. I use these for making laminated wood bows and they give perfect gluelines with wood laminates. I'll make the strips fairly narrow so I can leave small gaps between the wraps to check squeeze-out of glue etc.
How does one do that without destroying the bow?mikekeswick wrote:
So I removed the rest of the horn ...
Thx!
I used a heat gun on low setting.
I did it twice succesfully by steaming the hornstrip away, but be careful not to heat up the sinew to much.
Both times I used clamps to reglue the horn again. I protected the back with carpet strips that had square woodblocks glued on them.
I also did it different this time than Adam explains in his book. I let the glue gel up so much that it did not run anymore, and then clamped it together. Seems to work better than the former method I used, I think now less glue flows away.
Both times I used clamps to reglue the horn again. I protected the back with carpet strips that had square woodblocks glued on them.
I also did it different this time than Adam explains in his book. I let the glue gel up so much that it did not run anymore, and then clamped it together. Seems to work better than the former method I used, I think now less glue flows away.