Servos


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Thread: Servos

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    Member Jim Dawson's Avatar
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    Default Re: Servos

    Pro: They work well, no lost steps, generally more speed and power over a wider operating range.

    Con: Cost more than steppers, a bit harder to set up properly.

    Jim Dawson
    Sandy, Oregon, USA


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    Default Re: Servos

    To add to the "Pro's, they are also much quieter and less prone to resonances at lower speeds. Must say however, the various sounds of steppers can be quite pleasing at times :-)

    To add to the "Con's", a runaway servo can slam against a hard-stop which could be mechanically "damaging" whereas a dead stepper driver/motor combination is just going to "not work".

    On my machine, I chose steppers for compatibility with some existing equipment I had but in hindsight, I should have chosen servos.



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    Default Re: Servos

    Could also look into hybrid stepper/servos, like they clearpath units.



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    Default Re: Servos

    Am running DMM 750w servos which bolt right into the NEMA34 fittings.

    Lots of torque and super accurate once calibrated thanks to the encoders.

    The setup is much more involved given each servo is 1hp.. mains powered so there’s a lot more electrical controls. Also need to pay attention to good electrical design rules and earthing to avoid noise.

    Really happy now everything is settled in.


    Sent from my iPhone using Tapatalk



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    Community Moderator ger21's Avatar
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    Default Re: Servos

    Could also look into hybrid stepper/servos, like they clearpath units.
    Clearpaths are not "hybrids". They are servos. What many call "hybrid" are actually closed loop steppers. Very different from servos.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: Servos

    gerry, oh, i must have misunderstood. then they seem to be a very affordable route for servos.



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    Default Re: Servos

    To those that have them,

    What do you use to control them? As I understand they would typically have a equivalent to a stepper driver. Do those connect similarly to some of the common electronics / software people use like, parallel ports, UC100, smoothsteppers, Mach, UCCNC?

    I have chance to disassemble some used automation equipment, and wondering if it's worth my while to take the servos.



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    Default Re: Servos

    Ditto on the Clearpath SD servo's.

    Integrated drivers/encoders are the bomb.



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    Member Jim Dawson's Avatar
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    Default Re: Servos

    Quote Originally Posted by infamous_panda View Post
    To those that have them,

    What do you use to control them? As I understand they would typically have a equivalent to a stepper driver. Do those connect similarly to some of the common electronics / software people use like, parallel ports, UC100, smoothsteppers, Mach, UCCNC?
    The Clearpath motors are controlled exactly like a stepper, have the same step & direction input.

    I have chance to disassemble some used automation equipment, and wondering if it's worth my while to take the servos.
    Yes, especially if the drives are included. It's really nice to have a matched motor and drive.

    Jim Dawson
    Sandy, Oregon, USA


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    Member he1957's Avatar
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    Default Re: Servos

    I'll back the Clearpath offerings as well. If/when I was to upgrade my machine I'd go straight to these, they have a drop-in replacement for my steppers.



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    Default Re: Servos

    Yeah Clearpath gets a lot of press in the community.

    The parts I'm getting are from Mitsubishi.

    https://us.mitsubishielectric.com/fa...sec-iqf-series
    https://www.mitsubishielectric.com/f..._je/index.html

    They look expensive, and have some really beefy wires going into them. I am just at a loss as to how to get UCCNC and a UC100 to talk to these parts.



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