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  1. #13
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    Jul 2014
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    51

    Re: diy pic16f88 cnc servo motor drive 32 bit pid

    ahsameh: Is there more info, I would like to build my own servodrivers.

  2. #14
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    May 2005
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    1397

    Re: diy pic16f88 cnc servo motor drive 32 bit pid

    If you want an open source PID servo controller, which is also available as a very low cost kit, this one is released, tested, and works:
    BOBPID1: PID Servo Controller massmind
    James hosts the single best wiki page about steppers for CNC hobbyists on the net:
    http://www.piclist.com/techref/io/steppers.htm Disagree? Tell him what's missing! ,o)

  3. #15
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    Feb 2018
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    84

    Re: diy pic16f88 cnc servo motor drive 32 bit pid

    I don't know if anyone is still doing anything on this but this looks pretty interesting. My only problem is the lack of an H bridge that would support a 90 volt servo with a 120 volt input - has any seen something like this that would work with this board? I'd love to look at using these and an Acorn board to retrofit a mill that I have -

  4. #16
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    May 2005
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    Re: diy pic16f88 cnc servo motor drive 32 bit pid

    Quote Originally Posted by SEK22Hornet View Post
    I don't know if anyone is still doing anything on this but this looks pretty interesting. My only problem is the lack of an H bridge that would support a 90 volt servo with a 120 volt input - has any seen something like this that would work with this board? I'd love to look at using these and an Acorn board to retrofit a mill that I have -
    Best I can do is 40 volts:
    DRV8701: 1HP DC Motor H-Bridge Driver massmind

    But the BOB PID can run any H-Bridge that supports a PWM and Direction input.
    BOBPID1: PID Servo Controller massmind
    And can be modified to give 0-10 volt output signal in place of PWM.

    A modification to support +/- 10 volt signaling is in the works, as is ENC / RC output. It's all open source, but the repo isn't up to date so talk to me if you want to make changes.
    James hosts the single best wiki page about steppers for CNC hobbyists on the net:
    http://www.piclist.com/techref/io/steppers.htm Disagree? Tell him what's missing! ,o)

  5. #17
    Super Moderator Al_The_Man's Avatar
    Join Date
    Dec 2003
    Posts
    22993

    Re: diy pic16f88 cnc servo motor drive 32 bit pid

    Quote Originally Posted by SEK22Hornet View Post
    I don't know if anyone is still doing anything on this but this looks pretty interesting. My only problem is the lack of an H bridge that would support a 90 volt servo with a 120 volt input - has any seen something like this that would work with this board? I'd love to look at using these and an Acorn board to retrofit a mill that I have -
    I made a120vdc H-bridge based on Tahmids iR2110 Tahmid's blog: Using the high-low side driver IR2110 - explanation and plenty of example circuits you just need to size the Mosfets accordingly.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  6. #18
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    Feb 2018
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    84

    Re: diy pic16f88 cnc servo motor drive 32 bit pid

    was hoping to find something that didn't require a pcb layout - but the article looks pretty good. Right now in the middle of getting my new old Partner 1 Milltronics VM-17 up and running so this will go on the back burner.

  7. #19
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    May 2005
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    1397

    Re: diy pic16f88 cnc servo motor drive 32 bit pid

    Hey Al, do you have a sense of what the component cost was for that driver? I'd be interested in making a kit available if the price could be made reasonable.
    James hosts the single best wiki page about steppers for CNC hobbyists on the net:
    http://www.piclist.com/techref/io/steppers.htm Disagree? Tell him what's missing! ,o)

  8. #20
    Super Moderator Al_The_Man's Avatar
    Join Date
    Dec 2003
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    22993

    Re: diy pic16f88 cnc servo motor drive 32 bit pid

    I would have to look up my old Digikey invoices, I used a Pic 18F23K22 and communicated with RS485 serial Modbus type interface.
    120vac mains powered with isolation for the 5v logic.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

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