Customizable Depth Ring Tool

[Depth setting ring](https://www.precisebits.com/products/depthrings1250.asp), depth collar, tool distance ring, whatever you want to call it, these things are awesome for small router bits like the 1/8" endmills and drills you use in a CNC for things like PCB milling and drilling. They are, however, not commonly found on the cheaper bits I've accumulated, so I designed a tool for setting the bit depth appropriately. And, naturally, a ring I can use with my bits.

This design involves a base piece which has a pedestal the height of which the bit should project from the chuck (which includes the ring thickness) and a press which is calibrated such that the point of the bit is precisely at the bottom of the press. The press should be tapped to take a bolt of some sort (I'm using an M5x18 bolt, but YMMV) and the bolt should be long enough that a jam nut can be added to lock it in.

To use, the ring is placed in the hole of the base, the bit is inserted into the press with the tip out,