Sieg X2 Spindle/Drawbar cap

thingiverse

I picked up a LED tachometer with hall effects sensor to use on my mini mill, and wanted to mount the sensor in the drawbar cap. I could have drilled a hole in the OEM cap, but thought there was a chance it would not work (bad drill job, sensor too far from magnet, etc) so I printed a cap with a right sized hole at the location I thought would work. I placed the magnet at the bottom of the drawbar hex, and being that close to center of rotation it holds fine at max rpm with no need for adhesive. The sensor clears the spindle mounting nut and picks up the RPM, so I'm pretty happy with the setup. Including the .fcstd file in case you need to modify to fit your application. I printed several ring/slices with varying diameters till I got the fit right. I recommend doing this so you get a tight fit and don't waste a bunch of filament.