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In article , wrote:
Stephen M wrote:
....
Hidden in all of that is the false assumption that the presurfaced stock is
actuallly flat and straight when you buy it. It's probably pretty flat when
they mill it, but it probably has plenty opportunity to "move" after
milling. By definition, you de not get to acclimate your stock before
milling, because it's milled in someone else's shop.

But that's a different operation (resurfacing)...if the two surfaces are
parallel, they'll remain so within the differential expansion of one
portion of the same board wrt to another which is going to be quite
small...

It's true that once made parallel, they will remain parallel. But if the stock
was milled in someone else's shop, once it acclimates to the temperature and
humidity conditions in *your* shop, it may no longer be straight and flat.

--
Regards,
Doug Miller (alphageek at milmac dot com)

Nobody ever left footprints in the sands of time by sitting on his butt.
And who wants to leave buttprints in the sands of time?