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  1. #1
    Join Date
    Jun 2015
    Posts
    13

    Choosing servos

    Hi, I am on my first cnc build and I need some explanation.

    To calculate size of servos I use https://www.orientalmotor.com/motor-...w-sizing.html# , but it gives me lower Nm numbers than I have read in over the internet. I am confused about acceleration/deceleration t1 value, don't know whats fast or slow?

    X axis

    150kg mass
    friction 0.1
    ballscrew 25mm, 1500mm, lead 5mm
    efficiency 90%
    material steel
    external force 100N
    no transmission, direct fit
    angle 0
    fixed speed 210mm/s
    acceleration/deceleration t1 0.2 ???
    safety factor 1.5

    It seems basically one 750w 2.39Nm is ok? I want to run on 2x X axis ballscrews and my gut feels minimum is 2x750W Servos. Does my values are wrong?

  2. #2
    Join Date
    Dec 2003
    Posts
    24216

    Re: Choosing servos

    Kollmorgen also have a graphical sizing program, for different kinds of formats, Mills, lathes etc.
    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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