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Digital Industries, Motion Control, Machine Tool Systems

Vertical Mill, Lathe Project Log > 18x18 Linear Rail Tormach Build. - Page 3
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  1. #41
    Join Date
    Jun 2010
    Posts
    1414
    About to order the 570 oz steppers, now just debating on the power supply I need.
    Suggestions?

    Here is what I have on my X2:
    70V 800W 5V 12V Power Supply CNC Mill Servo Step Motor | eBay

  2. #42
    Join Date
    Sep 2006
    Posts
    1738
    Hey man, great build.

    Love how you went with the Tormach spindle because I have been contemplating doing the same if I go the "build my own machine" route. The options for the ATC are already pretty open with that spindle. Very interesting build.

    BTW, I'm in Jersey...whats your location?

    -Jason

  3. #43
    Join Date
    Jul 2008
    Posts
    390
    Quote Originally Posted by nateman_doo View Post
    About to order the 570 oz steppers, now just debating on the power supply I need.
    Suggestions?

    Here is what I have on my X2:
    70V 800W 5V 12V Power Supply CNC Mill Servo Step Motor | eBay

    I don't know what drivers you are using, but I would go off the guidelines for Geckos. I pulled this from Yahoo! Groups Mariss is the lead engineer at Gecko IIRC.

    I think something got mangled in the reply. The 4 to 20 supply voltage
    rule applies in either case (round or square). The power supply current
    rule is 2/3 of the motor's rated current for round motors, equal to the
    motor's rated current for square motors.

    Mariss

    --- In geckodrive@***********.com, "jerryflyguy" wrote:
    >
    > Mariss I've been talking to Mr Campbell from Campbelldesigns.com, and
    > figuring out my power supply requirments. He mentioned that your 4 to
    > 25 times the rated stepper voltage formula, actually only applied to
    > the old round motor's. He also mentioned you were planning to come
    out
    > with a new number/formula for the new, more effecient sqr motor's.
    I'm
    > just wondering if you could pass on what that number should be? I'm
    > looking at running Nema 34's w/ 2.3 v and 6.3A per phase. [four in
    > total] also I remember reading someplace that a person should total
    > their needed current and then build the power supply to meet 65% of
    > that number.. is this correct or is my memory giving me fits??
    >
    > Thanks!
    > Jarrett Johnson

  4. #44
    Join Date
    Feb 2006
    Posts
    7063
    The correct supply voltage for any stepper is 32 times the square root of the winding inductance, in milliHenrys. Any lower, and you'll lose torque at higher speeds, as the coils will never saturate. Any more, and you'll just get the motors hotter. Supply current should be no less than 2/3 the motors rated current in the chosen connection mode.

    Regards,
    Ray L.

  5. #45
    Join Date
    Jun 2010
    Posts
    1414
    I live in morris county.

    I planned to use geko drivers as well. Same as I used for my X2 build. They work nicely.

  6. #46
    Join Date
    Jun 2010
    Posts
    1414
    Quote Originally Posted by HimyKabibble View Post
    The correct supply voltage for any stepper is 32 times the square root of the winding inductance, in milliHenrys. Any lower, and you'll lose torque at higher speeds, as the coils will never saturate. Any more, and you'll just get the motors hotter. Supply current should be no less than 2/3 the motors rated current in the chosen connection mode.

    Regards,
    Ray L.
    I never even heard of that. Lean something new every day.

  7. #47
    Join Date
    Jun 2010
    Posts
    1414
    2.5mH.
    I calculate 50V?
    According to my rough calculations. Sound about right?

  8. #48
    Join Date
    Jul 2008
    Posts
    390
    Quote Originally Posted by nateman_doo View Post
    2.5mH.
    I calculate 50V?
    According to my rough calculations. Sound about right?
    50V looks right to me.

  9. #49
    Join Date
    Jun 2010
    Posts
    1414
    I guess thats why my X2 motors get really hot. Only when I use the coolant and it splashes on the motor to cool it down.

  10. #50
    Join Date
    Jun 2010
    Posts
    1414
    I do like the style i linked because it has both a 12V and a 5V power supplies for the break out board.

  11. #51
    Join Date
    Jun 2010
    Posts
    1414
    56V 11A 5V 12V Robotic Motion Control Power Supply Fuse | eBay

    Guess this is the closest to 50V with the additional 5V & 12V sections

  12. #52
    Join Date
    Jun 2010
    Posts
    1414
    56V 11A 5V 12V Robotic Motion Control Power Supply Fuse | eBay

    Guess this is the closest to 50V with the additional 5V & 12V sections

  13. #53
    Join Date
    Jun 2010
    Posts
    1414
    Merry Christmas everyone!!

  14. #54
    Join Date
    Jun 2010
    Posts
    1414
    Took the day off, so I will try and get some work done bolting the bottom plate to the I-beams.

  15. #55
    Join Date
    Jun 2010
    Posts
    1414
    I beams bolted. daily progress is nice.






  16. #56
    Join Date
    Jun 2010
    Posts
    1414
    On a side note...

    Having some problems with one of my X2 steppers. It sounds like its spinning, and the shaft doesn't move. Seems like the slightest bit of resistance won't allow it to operate. If i slightly tighten the gibs, it just makes the spinning noise, but doesn't move. if I help the table along there is no problem. They are about 3 years old with some heavy use out of them. Does it sound like time for a new motor?

  17. #57
    Join Date
    Jun 2011
    Posts
    279

    coupling loose

    Sure the coupling hasn't worked loose from the motor shaft?

    Build is coming along nicely!!
    Chris

  18. #58
    Join Date
    Jun 2010
    Posts
    1414
    Quote Originally Posted by cjsamples View Post
    Sure the coupling hasn't worked loose from the motor shaft?

    Build is coming along nicely!!
    Chris
    nope, I can see the coupler not moving either. Plus I can see the 1/4" rear shaft not moving either. Just makes the spinning noise, and when I help it along it moves.

    I have had it with dovetails. Once I finish this build, i will re-re-rebuild my X2 and convert it to linear rails as well.

  19. #59
    Join Date
    Jul 2008
    Posts
    390
    Try turning the acceleration WAY down.

  20. #60
    Join Date
    Jun 2010
    Posts
    1414
    I will try anything at this point. i switched to another used motor as well, same problem.

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