Here's something I noticed last night and thought maybe someone could
provide a cause. I was running close to 1" walnut through the tablesaw.
As soon as the blade finished the cut, no noise came from the blade,
meaning, as I finished the pass between the blade and the fence, the
blade did not touch the wood. I cut some 1 1/2" pine, basically a 2x4
milled down to the right dimension, and as I finished the cut, the blade
was making contact with the wood several times. The pine was 2 - 3 times
longer than the walnut. Both were edged on a jointer with that edge
against the fence.
I checked and the blade is perpendicular to the sawtop as is the fence.
Any ideas why the blade hit the pine but not the walnut?
It could be your technique, but more likely the longer pine board was not
truly straight although it had just come from the jointer. This is all
assuming that you made no adjustments to blade height and or fence
I bet that I did adjust the blade height. I always check height and
adjust the blade to the proper height for the thickness of the wood. I'm
certain that I changed the fence position as well. I use an incra TSIIIa
system so the fence should be parallel with the blade at all times, but
I haven't had it long enough to know that from experience.
Well, the fence is most likely not the problem....I had envisioned a sears
model. If there is wear on the trunion there could be some shift in blade
angle relative to the fence as you raise or lower the blade... Are you
using a thin kerf blade by any chance? I could be deflecting in the thicker
My guess would be that you freed up some internal stresses in the pine when
you reduced it's width, which made it bow against the blade. What's the
grain like on the pine, are both the walnut and the pine quartersawn ? I'd
assume that the pine is younger than the walnut (i.e plantation grown),
therefore the grain isn't as tight as the walnut and more prone to movement
over both the short and long term.
Then again the simple answer could be that owing to it's length, any side to
side deviation from you guiding the pine through the final stages of the rip
is amplified 2-3 times more than the walnut...................
If everything is set up properly and the board is straight, most likely, the
wood is moving as it is being cut. This is common in pine or improperly
dried wood. I have had the kerf close enough to stop the sawblade. Or, it
curves against the fence, pushing the stock into the blade. I have also
had the end of the board curl up 10"-12" up in the air.
Look at the grade stamp for one clue. It probably says "S-Dry" on it.
Means a quick and dirty kiln trip to get the surface dry enough to plane.
No allowances made for the interior. So you have a partially case-hardened
piece of lumber, in the case of a 2x4, normally cut close to the heart where
the grain is as its most random, and your blade is heating the sides of the
cut as it moves through.
I wonder why every board doesn't act squirrelly.
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