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Bending wood in steam

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bownarra:

--- Quote from: JNystrom on March 09, 2020, 03:02:00 pm ---bownarra: Problem with that is finding the green wood when you need it. For me it was much much easier to get a stockpile of fresh maple that i will be using for some time still to the future. In a perfect world, yes, use fresh wood and everything is easy.

--- End quote ---

As I said OR use thin pieces laminated together OR use pregrown pieces.....
When making hornbows its a good idea to try and make everything 'perfect'. :) The house of cards starts getting unstable overwise.....

gorazd:

 .... I did the turkish hornbow with laminated siyahs. Glued 4mm laths from black locust together
I prebend the laths with dry heat in form then glued them (in form )with hide glue.




--- Quote from: bownarra on March 10, 2020, 01:39:18 am ---
--- Quote from: JNystrom on March 09, 2020, 03:02:00 pm ---bownarra: Problem with that is finding the green wood when you need it. For me it was much much easier to get a stockpile of fresh maple that i will be using for some time still to the future. In a perfect world, yes, use fresh wood and everything is easy.

--- End quote ---

As I said OR use thin pieces laminated together OR use pregrown pieces.....
When making hornbows its a good idea to try and make everything 'perfect'. :) The house of cards starts getting unstable overwise.....

--- End quote ---

Tom Dulaney:
Of course, the typical steam bending method works most of the time (with some practice).
But what really happens to wood that has been bent to an extreme curvature? Even if it didn't crack or delaminate, I have to imagine that cellular damage is occurring.
Could a steamed bend mitigate some of it?

bownarra:
Heat weakens wood (IMHO  :) ).
So you should use the minimum amount of heat necessary to do the bend.
Boiling under water is more effective than steam for heat transfer IMHO.

JNystrom:

--- Quote from: bownarra on March 13, 2020, 02:21:58 am ---Heat weakens wood.
So you should use the minimum amount of heat necessary to do the bend.

--- End quote ---
Can you provide proof for this? At what amount are we speaking of? 20min, 40min, 60min?

I disagree that there is any harm done within 0-60minutes of heating wood (steaming, boiling). Many people state heat weakens wood, but they never provide scientific proof for it.

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