Reply by bobro

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Posted on Cupped wood = bent blade?

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320 posts in 1871 days

#1 posted 11-27-2014 04:02 PM

When you put a cupped board concave face down, it’s possible to actually flatten it by force. That’s why you hand plane the rising edges of the concave side first, not place it concave side down and plane off the hump of the convex side first, as would seem logical. Same reason people get cupped boards coming out of the power planer when it would seem they shouldn’t.

It may be that you were unwittingly exerting leveraged sideways force against your tablesaw plade using the mechanical power of flattening the arc of the cup wood, trapped between fence and blade.

Did the blade bend away from the fence?

I know it sounds kind of far-fetched, but what other explanations are there, if the blade really did get bent? First time I’ve heard of a tablesaw blade getting bent in a single shot, by the way. Teeth, sure, and cracks, and bent over time and abuse, but in one pass?

-- Lao Ma: You are so full of anger and hatred. Xena: Everybody's gotta be full of something.

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