NEMA 17 & 23 Stepper Motor Turning Tool *UPDATE*

thingiverse

This tool requires an M3 x 20 screw, an M3 nut, a 3/8" X 1 1/2" bolt, a 3/8" nut, and washer. One crank fits NEMA17 and the other fits NEMA 23. The knob design is derived from this great source: http://www.thingiverse.com/thing:17740. I created the crank myself. Initially, I wondered why Shapeoko 2 motors had a dual shaft. However, I found that it's useful for positioning the Z-axis when the machine is not powered up, which this crank takes advantage of. UPDATE: Check out this video (http://youtu.be/6VvwGszE8Xo) to see that the stock version of Shapeoko 2 functions as advertised but can be unreliable and dangerous. I had to go through two sheets to get a small bracket cut properly, resulting in wasted time and money on materials. The stock design is unreliable, so I discontinued using the machine until I obtain a TinyG stepper motor controller. The GRBLShield generates too much electrical noise, causing unexpected plunges into the wasteboard and damaging engraving bits twice during the Homing Command. If you need a Shapeoko, buy the mechanical kit with NEMA 23 motors and TinyG; the full kit has faulty electronics and small motors, making it a glorified "Spyrograph."