Router Bits - Cont.

The thicker the shank diameter, the less vibration, and large shanks resist bending and breaking. Large shanks accommodate large diameter router bits.

Router bits and collets should be checked regularly for signs of wear, and they should be replaced if damaged. Rust and corrosion on either the bit or the collet reduce the collet's holding power. Also, collets and router bits must be free of lubricants. Router bits should be inserted all of the way into the collet then backed out slightly (0.0625 in.) to ensure it is properly seated. Collets must be free from chips, shavings or any other foreign bodies. Making a vertical line on a bit's shank and a matching line on the collet as indicators provides a good safety check. The indicator lines should be aligned prior to starting a job, and they should be checked shortly after starting the job. They should remain aligned. If they moved, that is an indication that the router bit is slipping in the collet, and it may be necessary to clean or replace the collet.

Carbide-tipped router bits should be inspected thoroughly to ensure the brazing that holds the carbide in place is secure. The surface of the bit's body should be free of rust or pitting, and it should be well ground and smooth. A rough finish on a router bits body can collect debris that could slow the bit down. Carbide router bits should have cutting edges, which are free of grinding marks or chips.

Router Bits Home