Reply by Walker

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Posted on tear out using dado blades

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384 posts in 1242 days

#1 posted 03-29-2020 04:36 AM

Any chance your dado stack is the Oshlun SDS-0842? That’s the one I have, and I don’t have any issues with tear out. For the record I have the cheapest of all ridgid saws, the R4516 (in other words pretty terrible).

The things that reduce tear out on a dado stack are the same as a normal blade. Make several passes, use painters tape on edges of cut, add a sacrificial board on end of cut. (tough to accomplish on a table saw sometimes). Make sure feed rate is just right. A zero clearance insert will help. Beyond that, you may have some blade wobble, if the arbor is moving or if the stack is not tight. On occasion I’ve had plywood panels that are warped just enough to cause issues, i.e. not sitting flat on the surface of the table saw.

Could also be the quality of your plywood.

If you’re still having issues after all that, try undersizing the cut with the dado stack. Then widen to final dimension with your router.

-- ~Walker

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