View Full Version : Orac conversion

20-10-2021, 10:06 AM
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.

21-10-2021, 11:09 PM
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.

22-10-2021, 09:34 AM
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