Operational with the "ELVI-baby" motor at 12 V & 5,2 A. Progress has been slow during the last month due to a new semester at the Uni - and having a bunch of students & PhDs to put "The Fear of God" in. // Gotta readjust the tangent angle of this assembly as the first gears revealed a slight helical angle of app 2 degrees. The 12V 18A Dell Power Brick is a little touchy when it comes to start-up currents: Sorted that out via a 10 K Potentiometer, an Arduino Uno and a 20 yrs old Graupner 50 amp R/C car motor control I had laying around. Guess I'll take the opportunity to make a stepper or geared motor vertical feed as well, as the Uno has quite a few I/Os left, and as motors and their controllers are free and plentiful, and the M4 threaded top feed is a little to fiddly for my taste. Figure a few will call this microcontroller business"frills", as it's not purely "Meccanical", but as long as it works... Reminding me of the cock-sure "old-timers" of the ham radio club, back in the early seventies and their excluding motto: "NO kids, NO lids, NO Space Cadets!" (Youngsters, Windbags on the mikes/ keys, and Computer/ Electronics geeks). That amateur radio club and its former members has now filled its purpose in Evolution and is now extinct.