Graphical Construction Glossary >> Tools. >> Power Tools >> Chuck Key
A 12mm three jawed chuck on a power drill and the key that is used to tighten it.
The basic mechanism is that of a rack and pinion. The leverage applied to the chuck by the key in this method is significant.
Smaller drills are able to use key less chucks and most of the rest of the hand held drills use these three jaw chucks.
On larger drill presses etc the grip of an ordinary three jaw chuck is not enough and tapered bits and chucks are used.
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