Think & Tinker, Ltd.
CNC router bits and carbide cutting tools with tutorials and technical guides

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Loading a Bit Into a Collet to the Proper Depth

Actually there is not any "proper depth" to insert a bit into a collet or tool chuck. However, there is a maximum depth as well as a minimum depth that a tool shank should be inserted to insure reliable clamping between the collet leaves and the shank surface (bit retention).

Minimum insertion depth -


Maximum insertion depth -