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WIP: homing sensor for CNC 4th axis

It's a mount for an inductive NPN sensor with an M8 threaded shaft like the "Finglei Electric LJ8A3-2-Z/BX-5V" I'm planning to use
to a chinese 4th axis containing a 50:1 harmonic drive.

There are 2 versions of this gear box. With 6 and with 4 mounting slots.
The sensor holder was designed to fit both.
(Technical drawing will follow, after I have tested the sensor.)

Update: In MK2 I forgot to leave clearance for the heads of the M6x30 machine bolts. So I had to change the design slightly for MK3.

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