Recently, I was interested in the topic of metalworking at home. And in the process of studying, I came across a project of electronic gears for a lathe.

Any lathe at least has an automatic longitudinal feed. In entry-level machines that do not have a gearbox, there is a so-called "guitar" (or banjo). This is a set of 3-5 gears transmitting rotation from the spindle shaft to the longitudinal feed shaft. Using auto-feed, you can not only sharpen metal, but also cut threads. To do this, "just" install other gears. The thread pitch depends on the gears included. Represented this hemorrhoids with disassembly and rearrangement?

So: one bright head came up with how to throw these gears away. On the longitudinal shaft put a stepper motor, one more to the heap on the transverse feed and steer them with the help of Arduino. As a result, the ease of use of a hobby class machine jumps sharply upwards to industrial machines for an train of money. For example: turning to and from the cartridge, auto-cutting any thread and in any direction, auto-sharpening cones, auto-sharpening balls, quick run from the joystick, program limits, etc.

Russian description lays there.