This post houses all of the related STL and product links I used to retrofit a small chinese micro-mill for CNC functionality. You can see more about the base Micro-Mill here: http://diy3dtech.com/micromill-resource-page/
To attached the motor mounts to all three axis, we used 3 inch long #8-32 bolts and taped the mill to receive them. I am sure there is a metric substitution, however the length will needed to be maintained.
To attach the motors to the lead screws, we used 3mmx5mm Brass Shaft Coupling (https://amzn.to/2VLJvfZ) and drilled out and tapped the 3mm side to 4mm which screwed on to the shaft while the 5mm attaches to the motors. In full disclosure this works, however not the best because of the over rigidness, we likely rethink this so check back.
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uxcell 3mmx5mm Brass Shaft Coupling Coupler Motor Transmission Motor Connector for RC Boat Model: https://amzn.to/2VLJvfZ
SainSmart 3-Axis GRBL USB Driver Controller Board DIY Engraver Control Board for GRBL: https://amzn.to/2POWrfs
Stepper Motor Nema 17, 3 PCS Nema 17 Stepper Motor 4-Lead 1.8 Deg 40N.cm Holding Torque 1.7A 42 Motor : https://amzn.to/2H0Hx30
280Pcs M3 Alloy Steel Grade 12.9 Hex Socket Cap Head Bolt Screw Nut Assortment Kit with Storage Box, 4/5/6/8/10/12/16/20/25mm Length: https://amzn.to/2VOunyn
HVAZI 260pcs M3 Male Female Nylon Hex Spacer Standoff Screw Nut Assorted Kit (Black):https://amzn.to/2JF8Ku7
12v 30a Dc Universal Regulated Switching Power Supply 360w:https://amzn.to/2VbTJ4Y
Mounting bracket for NEMA 17 stepper motor for Y and Z Axis: DIY3DTech_MicroMill_YZ_v2.stl
Mounting bracket for NEMA 17 stepper motor for X Axis: DIY3Dtech_MicroMill_X_v2.stl
These stand-offs are only needed depending on your motor shaft length. Note, they are all the same just different thickness so if you modify the Z height in your slicer to fit your need if required:
Since the dive for the table motions are both push and pull, the threaded rods must restrained and that is the purpose of the these bushings. Like the motor spacers, they are the same except for the length and if needed can be scaled in a slicer:
These two pieces mate via M3's (10 to 12mm) to mount the SainSmart (https://amzn.to/2POWrfs) control board to the back of the micromill. The board itself mounts the base via M3 Nylon standoffs (https://amzn.to/2JF8Ku7):
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Major Favor: if you make one of these please post the Make and share it with the community :-) .
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