Stop/Start, Jerky, Shutter Movement with Mach3 - Page 2


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Thread: Stop/Start, Jerky, Shutter Movement with Mach3

  1. #13
    Activation process Shawn_M's Avatar
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    Default Re: Stop/Start, Jerky, Shutter Movement with Mach3

    I have a modified HY-6040 machine running with new stepper motors and a G540 with Mach3 and Cut 2D software. My cuts are also excellent but for the life of me I cannot figure out why I also have a lot of little short straight runs to create a curve in my part. I also notice a small jumping movement (or shutter, or stop/start movement) at every point along the part BUT there are very few points. I have read this entire topic and nothing seemed to work. Main difference is I am importing a DXF from AutoCAD. I first join all vectors and then fit curves to vectors. I end up with very few nodes which I thought would be best. I tried the G64 command, all the various CV settings, faster/slower settings and I'm at my wits end. It cuts great but why all the jerking?

    My Mach3 setup is as follows:
    • “LookAhead” is set to 200 lines.
    • Motion Mode is set to “Constant Velocity”.
    • CV Feedrate is turned off (on the setting page of Mach3) and all other CV setting on config are not checked.
    • All motors are set the same to 135 ipm, with acceleration set to 10
    • Nearly all my cutting is at 80 ipm feed rate and I've tried to speed up and slow down with no help

    Computer
    The computer used to run Mach3 is dedicated to just the CNC machine. It is not connected to the internet, no anti-virus, no other program running. Only Mach3 software is loaded on it. 25K kernel speed

    I have tried so many different settings, turning this off and that on and no improvement whatsoever.

    I'm not sure if the post processor is the issue or not. Here's the G code that my Vectric Cut 2D software spits out:

    ( test cut)
    ( File created: Monday April 15 2019 - 04:34 PM)
    ( for Mach2/3 from Vectric )
    ( Material Size)
    ( X= 7.000, Y= 1.750, Z= 0.125)
    ()
    (Toolpaths used in this file)
    (Profile 1)
    (Tools used in this file: )
    (5 = End Mill {0.25 inch})
    N100G00G20G17G90G40G49G80
    N110G70G91.1
    N120T5M06
    N130 (End Mill {0.25 inch})
    N140G00G43Z2.5000H5
    N150S12000M03
    N160(Toolpath:- Profile 1)
    N170()
    N180G94
    N190X0.0000Y0.0000F100.0
    N200G00X-0.1377Y-0.6030Z0.2500
    N210G00Z0.1250
    N220G1Z-0.1260F30.0
    N230G3X1.2097Y-0.4494I-5.5205J54.4290F100.0
    N240G1X1.4700Y-0.4155
    N250G1X1.5904Y-0.3984
    N260G1X1.5924Y-0.3981
    N270G1X3.1625Y-0.1360
    N280G3X3.2183Y-0.1117I-0.0206J0.1233
    N290G3X3.2746Y0.0028I-0.0883J0.1145
    N300G3X3.2179Y0.1175I-0.1444J0.0000
    N310G3X3.1625Y0.1415I-0.0760J-0.0993
    N320G1X1.5924Y0.4036
    N330G1X1.5907Y0.4039
    N340G3X0.6490Y0.5276I-3.3852J-22.1223
    N350G3X-0.4462Y0.6276I-3.2813J-29.8737
    N360G1X-0.6424Y0.6401
    N370G1X-0.7188Y0.6423
    N380G1X-0.7513Y0.6446
    N390G3X-0.8762Y0.6232I-0.0292J-0.2042
    N400G3X-0.9675Y0.5327I0.1014J-0.1936
    N410G1X-2.9205Y0.3918
    N420G1X-2.9345Y0.3900
    N430G3X-3.2550Y0.1121I0.0771J-0.4128
    N440G3X-3.1489Y-0.2838I0.3495J-0.1185
    N450G3X-3.0506Y-0.3478I0.2707J0.3086
    N460G3X-2.9334Y-0.3847I0.2010J0.4343
    N470G1X-2.9205Y-0.3863
    N480G1X-0.9638Y-0.5275
    N490G1X-0.9543Y-0.5368
    N500G3X-0.8372Y-0.6327I0.1858J0.1072
    N510G3X-0.7132Y-0.6438I0.0849J0.2506
    N520G1X-0.6618Y-0.6390
    N530G3X-0.1377Y-0.6030I-0.2933J8.0947
    N540G00Z0.2500
    N550G00Z2.5000
    N560G00X0.0000Y0.0000
    N570M09
    N580M30
    %

    Any help would be great,
    Shawn



  2. #14
    Activation process Shawn_M's Avatar
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    Default Re: Stop/Start, Jerky, Shutter Movement with Mach3

    Well Google saved the day for me. After an exhaustive search and lots of reading I found a post where someone mentioned turning off "CV Feed Rate" in the setting page off, this did the trick.



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Stop/Start, Jerky, Shutter Movement with Mach3

Stop/Start, Jerky, Shutter Movement with Mach3