Closed loop control in PlanetCNC

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    Default Closed loop control in PlanetCNC



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    Default Re: Closed loop control in PlanetCNC

    PlanetCNC controller will not read position from scales or encoder. Most modern servo drivers and some stepper drivers will do this. After all, it is drivers "job" to position motors where it was instructed to.



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    Default Re: Closed loop control in PlanetCNC

    Quote Originally Posted by PlanetCNC View Post
    PlanetCNC controller will not read position from scales or encoder. Most modern servo drivers and some stepper drivers will do this. After all, it is drivers "job" to position motors where it was instructed to.
    Thank you for the reply. If I use a servo drive, will it read the absolute position value from the PC in some way or does it also count the step&direction pulses and continuously calculate the required steps? Eg the x axis must move from 0 to 10 mm- the control outputs 100 steps- the servo drive counts 100 step pulses and moves the motor 100 "steps" or more until it reads the required position. Some error could creep in due to rounding.

    Sent from my LG-D722 using Tapatalk



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    Default Re: Closed loop control in PlanetCNC

    A servo drive will move the number of steps it receives, and use the encoder's to make sure it moves to that position.
    Whether you send it 100 steps or 10,000 steps, it moves the motor that amount, and uses the encoder to verify that it's at that position. There are no rounding errors.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

    (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: Closed loop control in PlanetCNC

    Ok, thank you Ger I am eager to add encoders to my existing CNC. Will have to add some circuitry to interface with my encoders and do the positioning.

    Sent from my LG-D722 using Tapatalk



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    Default Re: Closed loop control in PlanetCNC

    If your existing machine has steppers, adding encoders is very different from a servo drive, which is what I was talking about. I've never used Planet CNC, but I wouldn't expect it to even support adding encoders to steppers?

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

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


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Closed loop control in PlanetCNC

Closed loop control in PlanetCNC