Dado dimensions

I am working with black walnut pieces 1” wide and will be using a dado to join them. What clearance should I use for a good fit. A little over 1” I assume but not sure how much.

Thanks in advance
Steve

For a good, snug, “slip fit” I use about 0.010" (0.25mm) for most wood. Adjust for discrepancies in nominal -vs- actual size. If you’re gluing them you can probably go up to 0.015".

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Thank you for your quick reply. This will be my first project!

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