I added a feed screw onto my lathe so I don't wear out the threading screw doing repetitious feed or boring work, and because driving through the carriage traverse handle always leaves irregularities in the surfacing. This software uses a timer interrupt to precisely sequence stepper motor pulses, and uses multiples of the timer interrupt period to determine stepper speed. Right now it's set up to drive a half-step L298, but can be easily changed to a step/direction driver for a Trinamic or A4988. It could use a 2x16 LCD. I happen to be using a 4x20. Picture shows the same software/hardware driving a mill fourth axis rather than the lathe longitudinal axis.