775 spindle tachometer housing
thingiverse
This is an optical tachometer add-on for a 775 motor CNC spindle (ER11), attaching securely with two M4x12 Allen screws. You'll need just a 3mm IR LED and a 3mm photo diode, along with two resistors, an Arduino board, and a display to get started. Pre-programmed code for the Arduino can be found online; I'd also be happy to provide my own custom programs if you're interested. The ER11 chuck is reflective in nature, so I've covered most of it with black tape to ensure accurate revolution detection. One potential side benefit of this setup is that the motor's vent holes are repositioned to draw in air from the sides instead of the bottom, where dust tends to accumulate; however, its effectiveness remains unclear.
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