mrbmcg
Established Member
Hi Folks
I've seen this topic covered on a few threads and have a few questions for anyone who might have the answers.
I recently resawed a 50mm board of cherry right down the middle. It had been sticked in my workshop (heated and dehumidified) for nearly a month and should have been acclimatised (I have two thermometers/hygrometers - one in my house and one in the workshop and try to keep the rel hum and temp within about 5-10% of one another)
As soon as I resawed it it started to pinch together and by the time I got through the end of the board (about 1700mm long) the two halfs were bananna'd together with a gap of about 20 mm between them in the middle if both ends were held together. Now given that I wanted two 20-22mm boards I now have a bit of a problem
If I leave them to settle then I probably will only get about 15mm thickness per board which isn't any good. Is there anything I can do about it?
So, what actually happened? Was it stress relief? Was the board case-hardened (or reverse case hardened in this case?) or was it just caused by moisture release?
I can't see how the board would bow that much off the saw via moisture release, surely it would take a bit longer than that to develop? :?:
Stress release is my favourite choice currently, but isn't this rather a lot? I've had boards that bowed when resawed before but not this much. It doesn't say much about the quality of this timber.
Anyway, is there anythin at all I can do to straighten these boards either by clamping, adding moisture on one side or whatever? Its far too expensive to throw away? I spotted Noelys dew suggestion, could this be done by wetting the board on one side? There aren't many rain-free days north of the border in October.
Help!
Cheers
Bob
I've seen this topic covered on a few threads and have a few questions for anyone who might have the answers.
I recently resawed a 50mm board of cherry right down the middle. It had been sticked in my workshop (heated and dehumidified) for nearly a month and should have been acclimatised (I have two thermometers/hygrometers - one in my house and one in the workshop and try to keep the rel hum and temp within about 5-10% of one another)
As soon as I resawed it it started to pinch together and by the time I got through the end of the board (about 1700mm long) the two halfs were bananna'd together with a gap of about 20 mm between them in the middle if both ends were held together. Now given that I wanted two 20-22mm boards I now have a bit of a problem
If I leave them to settle then I probably will only get about 15mm thickness per board which isn't any good. Is there anything I can do about it?
So, what actually happened? Was it stress relief? Was the board case-hardened (or reverse case hardened in this case?) or was it just caused by moisture release?
I can't see how the board would bow that much off the saw via moisture release, surely it would take a bit longer than that to develop? :?:
Stress release is my favourite choice currently, but isn't this rather a lot? I've had boards that bowed when resawed before but not this much. It doesn't say much about the quality of this timber.
Anyway, is there anythin at all I can do to straighten these boards either by clamping, adding moisture on one side or whatever? Its far too expensive to throw away? I spotted Noelys dew suggestion, could this be done by wetting the board on one side? There aren't many rain-free days north of the border in October.
Help!
Cheers
Bob