I need to make a 10 slot BLDC inrunner motor core that is 40mm wide has 10mm inner diameter and 10mm thick. How would I make this? I would want to make it out of mild steel but I do not have a CNC machine and only a 3d printer. If anyone knows how a company that can CNC for me then send me parts, that would also be great(Bit like JLC PCB 3d printing service) as I think CNC is probably best route for this. Ideally I would like 8 of these cores.

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  • $\begingroup$ If it's $40, lots of time, and a 3d printer, spend the 40 on some fasteners. Wrapping wire around screws or nails, and a 3d printed case? $\endgroup$
    – Abel
    Aug 13 at 0:23
  • $\begingroup$ You can buy a hex or square shaft for the rotor. As long as your epoxy keeps the magnets on, and the shaft works alright in the bearings, you should be fine. You can cover the small amount of machining you need with a rotary tool with ceramic cutoff disks (like a Dremel), and cobalt drill bits (and a drill). $\endgroup$
    – Abel
    Aug 13 at 1:58
  • $\begingroup$ You limit the solutions to what you suggest. 3D printer and $40... $\endgroup$
    – Solar Mike
    Aug 13 at 6:49
  • $\begingroup$ Hmmm... I will get rid of the $40 budget if that is the case. $\endgroup$
    – Yassin
    Aug 13 at 8:55
  • $\begingroup$ @Abel I also thought about 3d printing the case. The screws are a neat idea, however, I am pretty sure they do not demagnetise quickly, and retain a lot of residual magnetism, so it wouldn't be very efficient... $\endgroup$
    – Yassin
    Aug 13 at 8:59


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