Let's talk about the design and build of a large cnc router/mill. In the rotating ballnut system the nut is spun and the ballscrew is kept stationary the reverse of typical arrangments. There are a few advantages to this as discussed.

The pogo pin homing switches designed by Dirk can be found here:    • Start of Building My Inexpensive, Hig...  
Also big thanks to Boyan Silyavski for help with this design.

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