I designed a slip coupling for the CNC mill I built. You can see the Y-axis of the mill shown in the picture left. One nice feature of the slip coupling is that you can detach the motor from the threaded rod by just adjusting the grub screws. This is handy since it means you can quickly break down the mill. This was important since this mill was initially designed to go on the road with me to school in Australia and then after graduation when I was consulting.

The plugs were trimmed to sit flush with the metal in which they were mounted.

While the plug could have easily been turned out of bar stuck I cast up a bit of round stock with the excess of another pour. I turned it round, and then drilled out the core of the plug. Once the plug had been lathed and milled and the grub screws added I turned down the length of the plug (shown left) to be flush with the mounting aluminium.

I used the Taig lathe's horizontal milling attachments to turn my lathe into a simple mill. From there I milled a flat spot into the plug in which the grub screw would sit.

I really need a better way to hold small pieces of round stock. I know I can use V-blocks for bar stock but I am still not sure what the proper way to clamp small round work pieces is. For this project I pressed the work piece with soft word into the one true jaw of a simple shop vice. It worked ok but, aside from being a pain, was hard to keep accurately aligned.

The pin was just turned up into a T from brass barstock. Once turned I rechecked the T piece and center drilled and threaded it.