Collet Drill Stop (<1mm to 14mm)
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Drill stops loosely based on an ER20 collet are available. Select the appropriately sized collet for your drill bit. Insert it into the nuts and tighten down over your drill bit. It clamps firmly over a large area which reduces the probability of it coming loose or moving significantly. Collets also offer more concentricity with the axis of drill rotation, making them suitable for drilling wood without marring the surface. They perform better than metal-rings-with-set-screw drill stops that are commonly used. The nuts on these collet-based drill stops are knurled for easy hand tightening and removal. Applying a bit of PTFE lube or vaseline to the threads and taper, which are M28x2, is recommended. The collets should have +/- 1mm of flex when in use. If you can still move the drill after tightening down all the way, it's likely that a smaller collet needs to be used.
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