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  1. #1
    Because I cannot get any of my projects working I decided to start another in the hope I would succeed and get my inspiration back for my other projects, so naturally I am now stuck, a common theme

    My new plan is to build a leadscrew controller based on the Clough 42 project:


    I have bought a good few bits but I am now stuck on my choice of Servo/Stepper to drive the leadscrew, my plan is to drive the leadscrew from the tailstock end thus getting around any gearbox issues, the lathe is a Harrison M300 so not Chinese Micro Lathe territory.
    I would be very grateful for any and all suggestions as to what size/make/power of Servo or stepper motor I should be looking at, it is going to need to be of a decent spec because the leadscrew is 28mm diameter and 6mm pitch, so not lightweight.

  2. #2
    Have you also watched the whole Clough42 YouTube series? From memory, his lathe is roughly the same size as a M300 so I would use that as a guide. I would guess something like a 3Nm NEMA23 would be about right and run off 60-70V to get max torque. This is a lathe leadscrew, not a ballscrew driving a router, so it's torque rather than speed that's needed. So gear down ("belt down" doesn't sound right but I would use a toothed belt) from motor to leadscrew. While the leadscrew is pretty chunky so a fair bit of rotational inertia, the saddle is a heavy old lump as well with relatively high friction sliding surfaces and you have to get that moving.

    For this job, I would go stepper not servo. Closed-loop stepper, maybe, as they are not that much dearer than a plain stepper these days, but wouldn't go servo. Costs more, you don't really need the extra torque or resolution, and in fact the higher resolution of the servo might be a problem as you need a higher pulse rate out of the controller module which might push it a bit. Not done the sums to check that, though.

    I keep thinking about doing the same for my lathe but it would need a bit of modification to get the drive to the leadscrew and I haven't worked up the energy yet - or needed to prioritise this over the rest of the project list! - to figure out the details. Nice project, though.

  3. #3
    I used the same servo as James and it has been fine so far
    My video adventure is here!

    It was the isv57t integrated servo geared down 3:1.

    Iíve just seen James had a problem with his but maybe that was chance or it overheated being tucked away in the casting.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

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