Plywood fit test generator

Plywood is rarely the thickness on its label. Set your board and bit, cut this small test piece in a scrap, and see which clearance fits best before you cut the whole job. The file is machined exactly like the joints in the models.

A test comb with slots of increasing clearance.

These are estimates to help you plan. Manufacturers' own tables and your own tests come first, and nothing here replaces them.