Spindle Speed Sensor Timing Disc

This is a spindle speed timing disc for the 52mm Quiet Cut Spindle that is sold by Inventables for the Shapeoko, Shapeoko 2, and X-Carve CNC machines. The disc is designed to be press fit onto the top of the spindle, and has a single slot.

https://www.inventables.com/technologies/quiet-cut-spindle

I used a motor speed sensor module that I bought from Solarbotics.com
https://solarbotics.com/product/29196/

Press fit the disc onto you spindle, mount the sensor module so that the emitter a