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Thread: Orac conversion

  1. #1
    Hi, I am partway converting an orac lathe to Mach3. However I am having a bit of a problem finding suitable motors for the axis. So far it looks like a nema 34 size motor fits, but the only ones I have found have all been 8 wire, I need 4 wire motor. The original shalf dia is 9.5mm, I can increase the diameter of the motors belt pulley a bit, but think that the nema 14mm shalf maybe pushing it a bit. So what motors have you used to replace the originals ones. Thanks.

  2. #2
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 3 Days Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,908. Received thanks 360 times, giving thanks to others 8 times.
    8 wire motors can be wired to use 4 wire.
    I'd guess the old shaft diameter is more likely to be 3/8" (9.525mm).

    Suitably geared Nema 23/4 motors will likely give better performance than Nema 34, but sometimes the convenience of not having to adapt mountings makes the larger motors simpler to fit.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  3. #3
    Thanks m c for your reply. I can easily make the adapter plates, but I think the shelf’s would then be a bit short, will take a look at nema 23 thanks again

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