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IndustryArena Forum > Machine Controllers Software and Solutions > Mach Software (ArtSoft software) > Stepper motors are still going at the incorrect speed. Need help with Mach3
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  1. #1
    Join Date
    Feb 2004
    Posts
    427

    Stepper motors are still going at the incorrect speed. Need help with Mach3

    I have this system on a plasma table.

    Cut area 3m x 2m
    Geckodrive G202's
    48Volt 13amp power supply
    Running two 1200oz-in steppers on the x axis.
    And one 270oz-in stepper for the y axis.

    Using CorelDRAW, AutoCAD, SheetCAM and

    Mach3.

    The motors are all tuned up right. They have the correct steps per unit etc.

    --------------------------------------------

    ----------
    The problem:

    If the velocity is set to 10,000mm/min in the 'motor tuning' page for both the x

    and y
    axis. And I go and jog the gantry in the y axis it will move along at the correct

    speed of 10,000mm/min. This will be shown in theDRO.

    But, if I jog with the x axis the motors will move at 14,000mm/min instead of the

    10,000mm/min that was setup in the 'motor tuning' page. This problem will also

    happen if I run a g-code through Mach3. Say for example I run a square shape.

    The feed speed will be set on 5000mm/min. The y axis will feed correctly at the

    set 5000mm/min. The x axis will move faster than the set speed that it is meant

    to. It will move at 7000mm/min instead of the 5000mm/min required.

    I have checked that the speeds that the DRO are reading are correct.
    How I done this was, Made the machine run for a distance of 1meter and counted how

    long it would take to travel the 1meter.

    From those results it showed that the DRO are giving me correct readings.

    I have alos cut out a part in 10mm steel with the plasma. You can see how the

    edges are smooth and perfect, then the gantry
    makes a right turn and the x axis starts driving. The x axis moves faster than

    the y axis and therefore the cut edge is very poor.

    I am only a newbie to this so I have tried everything that I can think of.
    I wiped all traces of Mach 3 then reloaded Mach3 again. Making sure to re-boot

    after the instalation.

    So I am stumped as to what is going on.



    Can anyone help?



    P.s on the gecko's I adjusted a 'trimpot' which is the 'low speed vibration'

    trimpot screw. Maybe this has effected the motors etc...
    I adjusted the screw at the back of the Gecko untill the vibration in my machine

    went away.


    Peter
    Australia

  2. #2
    Join Date
    Mar 2003
    Posts
    35538
    Quote Originally Posted by Apples

    I have checked that the speeds that the DRO are reading are correct.
    How I done this was, Made the machine run for a distance of 1meter and counted how

    long it would take to travel the 1meter.

    From those results it showed that the DRO are giving me correct readings.
    This may not be terribly accurate depending on the acceleration values. Are X and Y accel set the same?

    If you go to MDI page, and enter G1 X1000 F5000 (from X0), what does the feedrate DRO read?
    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
    Mar 2003
    Posts
    35538
    Say for example I run a square shape.

    The feed speed will be set on 5000mm/min. The y axis will feed correctly at the

    set 5000mm/min. The x axis will move faster than the set speed that it is meant

    to. It will move at 7000mm/min instead of the 5000mm/min required.

    Can you post the g-code you used for this?
    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)

  4. #4
    Join Date
    Oct 2004
    Posts
    742
    Quote Originally Posted by Apples
    I have this system on a plasma table.

    Cut area 3m x 2m
    Geckodrive G202's
    48Volt 13amp power supply
    Running two 1200oz-in steppers on the x axis.
    And one 270oz-in stepper for the y axis.

    Using CorelDRAW, AutoCAD, SheetCAM and

    Mach3.

    The motors are all tuned up right. They have the correct steps per unit etc.

    Peter
    Australia
    Are you running the two 1200 in/oz steppers off 1 Gecko, or do you have each of the 1200 in/oz steppers running off its own drive?

    Jerry

  5. #5
    Join Date
    Feb 2004
    Posts
    427
    Hi everyone,

    Thanks for the relpy's.

    Here is a G-Code of the square.

    I ran this on the other computer which is a laptop. And It ran fine with Mach3. Both axis's moved at the correct 1300mm/min.

    --------------------------------------------------------------------

    N0000 (Filename: square.tap)
    N0010 (Post processor: Plasma1.post)
    N0020 (Date: 18/12/2005)
    N0030 G21 (Units: Metric)
    N0040 G53 G90 G40
    N0050 F1
    N0060 S500
    N0070 (Part: square)
    N0080 M06 T1 F1300 (Plasma, 2.5 mm kerf)
    N0090 (Process: Plasma, 0, Plasma, 2.5 mm kerf)
    N0100 G00 Z12.7000
    N0110 X125.3229 Y210.4756
    N0120 Z3.0000
    N0130 M03
    N0140 G04 P1
    N0150 G01 Z1.5000 F2540
    N0160 X200.3229 F1300
    N0170 Y135.4756
    N0180 X125.3229
    N0190 Y210.4756
    N0200 X120.3229
    N0210 M05
    N0220 G04 P5
    N0230 G00 Z12.7000
    N0240 M05 M30

    -----------------------------------------------------------------

    Cheers,

    Peter

  6. #6
    Join Date
    Mar 2003
    Posts
    35538
    Did you use the same .xml file, or a different one? If different, try copying the one that worked to the other computer.
    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)

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