On Sat, Sep 16, 2017 at 4:16 PM, Paul Koning via cctalk <cctalk@classiccmp.org> wrote: >>>> does anyone have any spare "pivot bushings" for the DEC H9xx series >>>> cabinets (H950, H960, etc)? (These are the short pieces with a conical >>>> top which fit over the hinge pins, at the bottom.) >>> >>> http://ana-3.lcs.mit.edu/~jnc/tech/jpg/H9xxPinBushing.jpg >>> >> If you have a lathe, this looks like a very nice beginner's project.
I was thinking much the same. I recently came into a 1990s vocational school CNC lathe (neighbor by my younger brother moved out and gave it to him on the way out), 3" x 6". Light Machines Corp made the control box and proprietary 8-bit ISA cards. This one came with an AT&T/Olivetti PC6300 that looks like it was an a car wreck (I needed a prybar to open the case). The disk was an ST251 on an 8-bit controller and, surprise, isn't readable. Worst case, if I can't resurrect the PC, I'll probably throw an Arduino on it and use modern Open Source tools for driving it (the LMC box has a DB25 with all the step and direction and endstop signals on it for Mach3 or Grbl or whatever). This sort of project would be perfect on this wee lathe. The pins would be trivial (just need to grind an HSS cutting bit with the profile you described), and the bushings not much harder (ordinary bit for the main diameters and the taper, then cutoff, then rechuck and cut down the face to get down to final length). -ethan
