I've been aware that the sap wood of any species is different in
density/make-up than the heartwood, that it drys at a different rate,
Well, it was interesting to observe something, an unintended "lab
experiment," as it were.
Had roughed out a Cherry hollow-form yesterday at a friend's shop.
He's got a nice, big, new Poolewood 2000, and I had this nice big
chunk of Cherry. About 10" across and a foot deep. It's been laying
around for about 3 weeks, had been circular cut from a log, but not
When I got to his place I had thought "no checks yet at all," as I had
checked the sealed end-grain in the bag, and no checks. Once removed
from the paper bag I could see the whole once SIDE of the blank was
checked pretty badly, and this was the side with sapwood.
So, I have to take a good 1/3 of the thing away to get past the
checks. Still an OK sized vessel, rough to shape, seal it up mostly,
and re-bag it.
Most of the sapwood had been turned away, except for a splash still at
the bottom, and on one side, mostly on the waste-area just above the
tenon. I unbag it today to show someone (remember, it's only been ONE
night), and the sapwood has checked & split in about 8 places again!
to either side where it's heartwood, it's solid & clear.
I found it VERY interesting, and a clear, real world example of how
sapwood works/acts differently than heartwood, expecially in drying