When installing cutters in portable routers, how far should the bit extend into the collect?

• A. Into the collect to a depth of at least 1/2 inch
• B. Into the chuck to a depth of 1 inch
• C. Into the router base plate
• D. Flush with the edge of the collect

Answer: (A)

Securing the bit properly in the router is essential for safe and stable operation. The bit shank must be engaged deeply enough in the collet so the collet can grip it firmly. Extending the shank into the collet at least half an inch provides enough surface contact for a secure grip, reduces runout, and helps prevent the bit from slipping under load.

Inserting the bit only a little into the collet or flush with the collet edge would leave insufficient grip and can cause the bit to loosen or wobble, which is dangerous. The router’s gripping mechanism for most portable routers is the collet, not the base plate, so the bit should not be inserted into the base plate or into a separate chuck in a way that leaves little engagement.