WM210V Dividing Head (worm gear) with NEMA 17 motor mount (belt drive)

thingiverse

This is a dividing head attachment for a WM210V type lathe, to be used by hand or used in conjunction with the NanoEls H4 (https://github.com/kachurovskiy/nanoels) The design is showcased here: https://github.com/kachurovskiy/nanoels/discussions/123 The build is a bit complex with many parts and probably needs some adjustments for your specific lathe. Thus, I only provide the fusion 360 .f3d file without timeline (it is a mess of revisions) for now. Be prepared to edit the spacer lengths and the housing hole pattern to your lathe. Bear in mind that my lathe was already modified before I added the dividing head (new spindle pulleys, no more hall sensor on the spindle, and more…). The pulley cover won’t fit on the lathe anymore without extensive modifications. It works as follows: - A 180t worm wheel is attached to the back of the spindle. I previously turned oversized spindle drive pulleys, so it was just a matter of adding some threaded holes to the pulley. Be sure to have the worm wheel be concentric with your spindle! - A short 10mm shaft is secured through the thick metal plate on the left side of the lathe. I believe the hole I used was initially to route cables into the electronic box. - The longer 10mm worm shaft assembly pivots on the previously mentioned shaft, allowing to engage/disengage the worm gear. - the pivoting movement of the shaft is limited by a custom housing. The worm shaft can be secured in the engaged/disengaged position through a wedge - Software Integration with NanoELS H4 is in progress. Thany you @kachurovskiy. see the previously mentioned GitHub for more information. The part "Shaft base" holds the stepper, and should be printed in heat-resistant filament. The rest should be fine in PLA. Additional parts I used for my build (might vary for yours!) - Turned brass worm gear: major diameter = 25mm, minor diameter = 21,85mm, pitch= 2,2mm, inner diameter = 10mm (+2 m3 threaded holes for grub screws) - 1x ≈280mm 10mm steel rod, with m10 threads at both ends (+ keyway/flat cut/files in for grub screws) - 1x ≈135mm 10mm steel rod, with m10 threads at both ends - 1x nema 17 stepper (I used 60mm) - HtdHTD 3m 56t (168mm) belt (9mm wide) - HTD 3M-20BF-B5-10: 20t, Typ BF, ø 5mm pulley - HTD 3M-30BF-B10-10: 30t, Typ BF, ø 10mm pulley - 6x M10 nuts - 9x M10 din 440r washers (≈11x34x2,6mm) - 3x M10 din 9021 washers (≈11x29,5x2,5mm) - 4x 6000-2RS Ball Bearings Double Sealed 10 mm x 26 mm x 8 mm - 2x F10-18M Axial Ball Bearings 10 mm x 18 mm x 5.5 mm - Various m3 hardware (cylinder head screws, grub screws, washers, nuts, brass inserts) - 1x m4 threaded rod (about 25/30mm) + washers & nuts (secures the housing at the front, into the threaded hole where the hall sensor used to be on the stock lathe) - 2x m5 x 100mm cylinder head screws + washers + nuts (holds the dividing head housing together) - 5x 1,5mm x 6mm steel dowel pins (optional, to align the dividing head halves perfectly. Use a 1,5mm hand drill to ream the holes in the printed parts for a good fit) - 1 piece of m10 threaded rod (25-30mm). Additional fastener to secure the dividing head housing to the lathe, through a former pulley-cover-bolt-hole - Printed adhesive scales for 0-360° (worm wheel) and 0-2° (worm shaft) - Piece of wire as an indicator for the 0-360° scale