After 15+years of wood working I've started getting concave rip cuts on my
tablesaw. The concave is ~.015" in the middle of the board, on boards that
are more than 14-16" long. This happens consistently with hardwoods mainly
red oak and walnut.
The saw is a Delta contractor with a shop fox fence,a Forrest blade, a
feather board, and NO splitter. The far end of the fence is less than 1/64
further out of square with the miter slot to avoid pinching. The blade
seems square with the slot - as best I could tell using a combination
squate. I've experimented with the amount of pressure by the feather board,
hand position, speed of the feed... and nothing seems to make a consistent
Any ideas on what the cause could be?
"The far end of the fence is less than 1/64 further out of square with
the miter slot to avoid pinching."
That's the first thing I wonder about. I've heard people prescribe this
notions of the fence tail being slightly "out" but I think it does more
hard than alleged good.
Also, explain why you have no splitter? You may have a good reason....
I've just never heard one. :-)
"Playing is not something I do at night, it's my function in life"
It might be worth getting the wrenches out and checking for loose bolts.
Even if it doesn't fix the problem, you'll be secure in the knowledge
that nothing's moving. (I probably ought to do the same.)
Have you tried a different blade?
While not impossible, I doubt seriously that the OP's problem, in two
different species of wood, is attributable to anything but the table saw
and it's setup 'in toto'; and would venture that "internal stress" in
the wood is not even a contributing factor to his problem.
Hopefully you have cured your problem but with the fence set away from
the blade it actually either follows the fence which is unlikely as the
waste is pulling it back toward the blade or it is not following the
fence because of the before mentioned and cutting more narrow the
farther it goes, causing you the concave situation.
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