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I recently purchased a stacked rail & stile bit. Using it with poplar, I'm getting chipping vs a smooth cut. Is speed the issue?

We usually recommend cutting these bits at a speed somewhere between 16,000 and 18,000 RPM. The chip out most likely is being caused by running against the grain instead of with it. You'll need to read the grain lines on the face of the stock and determine which direction will allow you to go with the grain instead of against it.

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