I used Gecko 320's with no breakout board to drive the X, Z and spindle. I had converted my millrite to CNC after I found some large (4" diameter x 6") 30 volt motors that had an encoder shaft but no encoder. With the big motors on hand and the encoders given to me by a friend the step and direction servo setup was the most economical at the time. The watchmakers lathe X and Z are some tiny little servos that a friend gave me (originally so I could cannibalize the encoders but that's another story) The spindle is driven with a timing belt and a larger servo. I run all my threading programs on the little lathe as if the spindle were an A axis. I used this setup because I had the servo, I had written X,Y,Z,A programs to thread on my Millrite, and the g33, g76 threading with an indexed spindle was not that clear in my mind and I didn't have an index on the spindle motor. The only real problem in using x,z,a with a axis spindle is the need to "unwind" the spindle after every pass. That's not a large problem when you are cutting a 00-90 thread .1 inches long. I'd be happy to upload some pictures of my little lathe but I am not familiar with the uploading sites. Could someone recommend a good "no hassle" site?
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