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Sawing and Drying

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Making big cookies

2/12/17       
Philippe Member

I would like to make cookies from a 22" branch of mapple. I am familiar Dr Gene Wengert suggestion of making cuts in 2 adjacent cookies and use the second cookie to fill the shrinking gap from the first.

I was thinking of trying the following:
1) take a cylindrical section and orient it perpendicular to the normal alignment,
2) center the blade on the pith and make a cut up to the pith, probably the cut will have to be off-center for logs too big to fit between the blade and blade carriage
3) back out the blade and
4) clamp the section vertical and make the cookies.
I guess this will need some serious clamping but it would allow all the cookies to dry with a predictable split.

Any suggestions, in particular for the clamping ? I usually put a flitch between 2 log rest and clamp the logs against it.

Thanks


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2/13/17       #3: Making big cookies ...
Philippe

Well it worked. A little iffy to clamp but doable. I missed the pith by a little bit.
The longitudinal sawing produces "angel hair" shavings that rapidly clogged the chute, but this was a rather short cut (12" deep, 24" wide).
The cookies look great, I will know in a few weeks if they develop cracks elsewhere then on the prescribed cut.


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2/14/17       #4: Making big cookies ...
Rip Log

Ripping, whether with a band saw or a chain saw always produces long chips. It is important to use a blade with a gullet of sufficient depth to carry away those chips.

2/15/17       #5: Making big cookies ...
Keith Newton

Another thing you can try, is to cut the cookies at an angle of mane 45º to the axis of the log. You'll still see the annual rings, but this may give the shrinkage difference between radial and tangental a way to get relief out the opposite faces, rather than cause it to split.

You'll still need to take the drying a little slow. When I turn big green vessels, I put them in a cardboard box so there is air space around them. This way the moisture leaving the green wood has to absorb into the closed airspace, then absorb into the box, before it evaporates again.
This slows it down, so the outside doesn't give up it's moisture faster than it can come up from within the middle, keeping the MC even throughout.

For your flat disk, you'll need to figure out a way to keep them up on edge so there is air all the way around.


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