What is a pin chuck?
|A pin chuck is a tool used to hold very small diameter drill bits or similar materials that cannot be held by a normal drill chuck.
|Normal drill chucks hold bits that have a shank diameter of between 10 – 13mm (⅜” – ½”), whereas pin chucks can hold bits ranging from 0mm – 2.5mm (0″ – ⅛”) in diameter.
|Different-sized collets are inserted into the pin chuck, and vary in diameter to hold small drill bits.
What is a collet?
|A collet is a circular device with jaws that forms a collar around an object. The collet is then tightened to hold the bit securely in place.
|A collet is needed in a pin chuck to allow it to hold a number of different-sized tool bits.
Also, the collet encompasses the whole bit giving a more secure and stable bit compared with a 3-jaw drill chuck which only grips at 3 points.
Woodworking pin chucks
|There are two products currently on the market called pin chucks. It is important not to get the two confused.
|The other type of pin chuck is mainly used in woodworking. This chuck is a steel rod with a flat cut-out. A pin is placed on this flat and the whole assembly is inserted into a pre-drilled hole in the workpiece, twisted and locked into place.
|The end of the pin chuck is then held in a collet or drill-type chuck to hold the piece of wood in a wood-turning lathe.