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IndustryArena Forum > Other Machines > CNC Wire Foam Cutter Machines > Mach 3 Speed Issue on four axis foam cutting setup!!
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  1. #1
    Join Date
    Nov 2010
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    0

    Question Mach 3 Speed Issue on four axis foam cutting setup!!

    Hi All, My machine ignores the Feed command on the y and a axis when they are locked using the formulas tab to enable me to do 2 axis cutting on my 4 axis setup. I had some kind help from learned friends and they found that it doesn,t matter what is linked to a the problem occurs. It seems like the a axis throws the speed out and mach compensates automatically to reduce the difference. They found a workable solution by re assigning the axis on the a side, unfortunately this is not workable in my instance, can anybody help us please it is an older version of Mach and I prefer using it for its build in cam software that I know and understand!!
    Kind regards

  2. #2
    Join Date
    Mar 2003
    Posts
    35538
    Is the A axis set to linear, or rotary?
    Gerry

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

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  3. #3
    Join Date
    Nov 2010
    Posts
    0
    Hi Gerry

    Machine is set up with X and Y axis on the left side and Z and A axis on the right side
    A is set as linear.

    Motor tuning for each axis was checked and all 4 axis were identical.

    With no formula’s and no slave axis,
    The following was noted:

    G1 X100 f200 X axis moved as expected at the correct speeds
    G1 Y100 f200 Y axis moved as expected at the correct speeds
    G1 Z100 f200 Z axis moved as expected at the correct speeds
    G1 A100 f200 A axis moved as expected at the correct speeds
    G1 X100 Y100 f200 both axis moved as expected at the correct speeds

    As soon as the A axis was run at the same time as any other axis (be it by Gcode or by formula or by slave axis )it seemed as if the movement of the two together ignored all accel and speeds
    If A and B are paired all works perfectly.

  4. #4
    Join Date
    Apr 2014
    Posts
    6

    Re: Mach 3 Speed Issue on four axis foam cutting setup!!

    I have something similar on my setup. My XY work fine, and my AB works fine when operated independently under G01. The moment I operate X with A (both horizontal axes) under G01, both axes run slow. I suspect this may have something to do with the fact that the software does not recognise these axes as parallel, and therefore compensates the axes speeds to get the correct feed rate (which will be a vector resultant of the two axes). I'm an absolute newbie, so this is just theory for now. I'm looking for an old timer to tell me how to set up the axes! will keep you posted if I find the old timer...

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