Rockler Drawer Lock Router Bit - 1" Dia x 1/2" H x 1/2" Shank

I have this bit and wanted to share something about using it with plywood. I have a cutting guage, something like a marking guage but with a small knife-like blade. Scoring the edge of the cross grain cuts will eliminate tearout. Much faster than taking two cuts, you heard it here first. :}

There is only one correct height setting for this bit. It doesn't matter what the material thickness is. 1. Set the bit so it sticks up approximately 3/8" above your router table. 2. Set the fence so it is slightly back from the lower cutter edge. 3. Run two boards across the bit. 4. Turn one of the boards over and fit the cuts together. If the fit is loose, you need to raise the bit slightly. If the tongues fail to reach the bottom of the grooves, lower the bit slightly. 5. Cut off the test cuts and repeat until you are satisfied with the fit. The fence settings will be different for the drawer sides and the front/back. Best for the sides is so the lower part of the bit just barely skims the ends of the side boards. Multiple passes that remove less material will reduce tearout. Save a sample setup board to use as a setup jig next time.