WIP: homing sensor for CNC 4th axis

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This is an ongoing project, still under construction.\nI'm creating a mount for an inductive NPN sensor that features an M8 threaded shaft, similar to the one used in the "Finglei Electric LJ8A3-2-Z/BX-5V" I plan to utilize\nin conjunction with a Chinese 4th axis that houses a 50:1 harmonic drive.\n\nThere are two versions of this gear box available - one with six and another with four mounting slots.\nThe sensor holder was designed to fit both configurations.\n(Technical drawings will be posted shortly after I've completed testing the sensor.)\n\nUpdate: In MK2, I inadvertently neglected to leave clearance for the heads of the M6x30 machine bolts. As a result, I had to revise the design slightly for MK3.\n\nBlog posting:http://marcuswolschon.blogspot.com/2016/12/adding-homing-sensor-to-4th-axis-on-cnc.html