500W 12000RPM spindle not enough?

New Home Forum Mostly Printed CNC – MPCNC Troubleshooting – MPCNC 500W 12000RPM spindle not enough?

This topic contains 34 replies, has 9 voices, and was last updated by  grishien 1 month, 2 weeks ago.

Viewing 5 posts - 31 through 35 (of 35 total)
  • Author
    Posts
  • #94045

    Ryan
    Keymaster

    Skipping steps is a sign of something drastically wrong, it is not a common problem, never has been.

    #94047

    Eric H
    Participant

    Are your spindle wires parallel to your stepper wires at any point? The higher current in the spindle wires can induce current in nearby conductors and interfere with step signals. I had some problems with skipped steps when I was using a 500w spindle due to what I believe was this issue. I had the wires powering the spindle parallel to some of my stepper wires, and every time I would have high engagement I would lose steps. I thought it was mechanical at first, but when I tried rerouting the cables the problem went away.

    Also, regarding slowing down at areas of high engagement. Troichoidal or Adaptive clearing are definitely great strategies for consistency. However, if you still want to do simple contour paths (slotting, finishing, etc.) there is a optional feature in Fusion 360 called “feed optimization” where the feedrate is reduced at corners like you want.

    #94104

    grishien
    Participant

    And – yes, it is.

    You can set such acceleration by DEFAULT_ACCELERATION or on the fly sending command M204 P200 where 200 is acceleration.

    I found 200 to work well (previously was 400). And you can slow it down even further thus making it move super smooth but it will greatly affect milling time.

    #94106

    grishien
    Participant

    Are your spindle wires parallel to your stepper wires at any point? The higher current in the spindle wires can induce current in nearby conductors and interfere with step signals. I had some problems with skipped steps when I was using a 500w spindle due to what I believe was this issue. I had the wires powering the spindle parallel to some of my stepper wires, and every time I would have high engagement I would lose steps. I thought it was mechanical at first, but when I tried rerouting the cables the problem went away.

    Also, regarding slowing down at areas of high engagement. Troichoidal or Adaptive clearing are definitely great strategies for consistency. However, if you still want to do simple contour paths (slotting, finishing, etc.) there is a optional feature in Fusion 360 called “feed optimization” where the feedrate is reduced at corners like you want.

    Eric, thanks for the info. I will check out.

    And no, spindle wires are completely apart from steppers wiring. I knew that people have problems with it so didn’t want to take risks.

    #99467

    grishien
    Participant

    If anyone cares or is having similar troubles – a lot depends on the bit itself. When I discussed this here I was working with 3 flutes bit made for aluminium, from Aliexpress. I had nothing to compare with so I thought that the bit is not applicable for blaming. When I received 2-flutes bit made for wood I realized that half of success is within the bit’s responsibility.

Viewing 5 posts - 31 through 35 (of 35 total)

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