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  1. #1
    Join Date
    Oct 2007
    Posts
    43

    calibration of x and y axis

    How do I get the proper ratio to calibrate my newly retrofit cnc router?
    When I run multiple cycles, the Y axis seems to move over a little each time, and after a few cycles the parts are out of tolerance. J.P.(group)

  2. #2
    Join Date
    Mar 2003
    Posts
    35538
    Is this a stepper machine? If it doesn't return to the same position, it's losing or gaining steps.
    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)

  3. #3
    Join Date
    Oct 2007
    Posts
    43
    I have a servo motor system, with encoders mounted directly on the motors.

  4. #4
    Join Date
    Oct 2007
    Posts
    43

    multicam mg series router gear ratio

    I recently had our multicam router retrofit with a camsoft software setup. I need to find out what the ratio is between the servo motor, and the rack and pinion gear setup, and also the motor and the ball screw. I need to know how many encoder pulses it takes to move 1 inch. Any ideas?

  5. #5
    Join Date
    Jan 2010
    Posts
    10
    I'm thinking a caliper and some trial and error to get your best fit there, the gear pitch and ratio was probably specific to the old software (if it came with the router, I'm assuming it did) especially if it's an older model before ISO standards. You may have to fudge the programming to get it to run the way you want it, too.

  6. #6
    Join Date
    Jan 2010
    Posts
    10
    oh, also you can try the data sheet for the specific servo model. Contact either the manufacturer or any other supplier, google search etc, but then again it depends on the length of the pulse input via your software (which you'll need an oscilloscope to measure).

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