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maple cores

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BowEd:
They should work Ritch and Aaron.
Last time I used the stick and rope method for horn to core joinery but with 3/16" thick cores.Some twist developes with that extreme amount of pressure used but can be corrected.Using a thicker core like you said David should come close to eliminating that.Then shaping the core and overall thickness like I want later before sinewing.

mikekeswick:
Ed - I think the best use for those is to make 5 piece cores from them. A 5 piece core is much easier to bend. !/2 inch is a bit too thin really for 3 piece, you can add a strip to build up the thickness at the tips but better to have solid wood. Tip pieces are easy to find.
Do not sand anything flat and don't bother using dry heat to straighten things out before boiling (notice I said boiling not steaming!), any correction would come out once heated up in the water anyway and dry heat will dry the wood further.
You should also cut to length and then soak the lathes in water for a week. Once bent a week on the form is plenty to stop any twist coming back. Make the form accurate and then simply clamp any twisted spots down to the form.
The best way to stop twist when using the rope method is to have someone hold the tip in place whilst you wrap or rig up a vice that clamps the tip stationary whilst you wrap. Even tip (19mm) cores will twist when using this method if you don't secure the tip somehow. Clamps are the best way to avoid twist as there is no danger of inducing any with clamps. It is quite easy to make homemade wooden clamps to save having to have 20 c-clamps!

gorazd:
Why not try  to pure dry-heat bending of the wood core ? I mean over  1/2 inch thick ...

I watched the videos how the wine barrel are made - from black locust wood strips .... they make a fire in the centre of barrel and (dry)heat bend the wood

BowEd:
Mike...I see your points.A V spliced tip into 1/2" thick core is'nt thick enough though?
I've got the tools here.Just need to make the forms for Adams' methods.

mikekeswick:

--- Quote from: gorazd on June 07, 2017, 05:34:21 am ---Why not try  to pure dry-heat bending of the wood core ? I mean over  1/2 inch thick ...

I watched the videos how the wine barrel are made - from black locust wood strips .... they make a fire in the centre of barrel and (dry)heat bend the wood

--- End quote ---

It won't work :)

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