TBV CNC C1 Lathe UCCNC Spindle Sync Demonstration

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Nearly a decade ago I purchased a Sieg C1 Microlathe to convert it
to a CNC powered lathe with Mach3. Aware that the spindle speed will vary
a lot when the tool is entering the material I manufactured a multi slotted disc and all necessary parts to attach steppers to it (All parts manually turned and milled ;-)). Those days there were nearly no inexpensive parts available and the couplers for example were made of PVC tubing. I also decided to keep the original screws for first instance. The result, of course, was a rapid speed only for the patient ones.
After some tests I came to the conclusion that also the multi-slotted feature was never realy implemented and I had to switch to a single slotted disk. With this set up the main target of producing threads with different pitches was no more reachable and the projekt ended half finished. There is no way to cut a usable thread with a lathe that has only 250W and a total weight of less than 60 pounds other than using a spindle endoder or directly use a servo for the spindle, one index pulse per revolution was a k.O. criteria.
In the meantime I built several mills, routers, laser and plasma tables. So my toolshop was well equipped. Then I came across the UCCNC feature with spindel sync motion by encoder and decided to give it a second try. I changed the conversion to ball screws and driven nuts and here is the result. (Video is quite long and only for hardcore chip fans)
First sync demo starts around minute 4, so feel free to skip. Parting off at the end is also a sync motion.