Jerky movement with Mach3 and Mastercam


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Thread: Jerky movement with Mach3 and Mastercam

  1. #1
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    Default Jerky movement with Mach3 and Mastercam

    Hello!

    I just finished my 4th axis build on a homemade CNC router. I did some positioning and wrapped toolpath in Fusion 360 and both worked fine. Then, I wanted to test some simultaneous milling with Mastercam and I can't seem to get it to work properly. First, I tried generating G code with Generic Fanuc 4X Mill and also Generic Haas 4X Mill post processors, but the toolpath I get from that is wrong. So next I tried with Generic Fanuc 4X Router post and got the correct toolpath. But when I run it on my machine, the movement is jerky and feedrates get very low sometimes(inconsistent feed). I will attach a link to a video so you can see and hear exactly what is happening.

    I also tried generating G code in inverse time feedrate(G93) but the movement is still jerky/inconsistent.

    Now i need your help, I think I tried changing every setting in Mach3 (CV, Look Ahead, Rotating Diameter,...maybe there is still something I forgot.)

    Maybe there is a problem with Mastercam calculating weird feedrates. I will post a sample of G code generated by Generic Fanuc 4X Router post and a screenshot of the toolpath. The toolpath is Multiaxis > Blade Expert and it is 4 axis roughing.

    ! Sound on !

    G code with G94: (on default post processor settings)

    (PROGRAM NAME - MASTERCAM TEST4)
    (6 SPHERICAL / BALL-NOSED ENDMILL TOOL - 1 DIA. - 6.)
    N100T1M6
    N110S2000M3
    N120G0G90X-2.5Y26.929Z38.538A26.202
    N130Y27.221Z34.866
    N140G1Y28.015Z24.898F1200.
    N150X-1.748Y26.896Z24.958F1500.
    N160X-.783Y25.56Z25.005
    N170X-.166Y24.5Z25.016A26.352F183.2
    N180X.147Y23.654A26.769F680.2
    N190X.483Y22.639Z25.013A27.259
    N200X.813Y21.453Z25.005A27.817F667.4
    N210X1.164Y19.757Z24.993A28.592
    N220X1.366Y18.569Z24.984A29.125F651.8
    N230X1.516Y17.209Z24.976A29.721
    N240X1.585Y15.849Z24.972A30.306F634.
    N250X1.596Y14.659Z24.971A30.814
    N260X1.636Y13.294Z24.968A31.196F416.6
    N270X1.612Y12.271Z24.969A31.481
    N280X1.517Y10.905Z24.973A31.859
    N290X1.36Y9.54Z24.981A32.236
    N300X1.081Y7.92Z24.992A32.684F405.9
    N310X.818Y7.717Z25.001A33.291F2000.
    N320X.602Y7.531Z25.007A33.853
    N330X.426Y7.362Z25.009A34.382
    N340X.284Y7.21A34.896
    N350X.168Y7.075Z25.008A35.409
    N360X.071Y6.958Z25.007A35.939
    N370X-.014Y6.857Z25.005A36.499
    N380X-.092Y6.773A37.103
    N390X-.205Y6.716A37.79
    N400X-.295Y6.695Z25.007A38.37
    N410X-.372Y6.709Z25.008A38.866
    N420X-.451Y6.76Z25.01A39.312
    N430X-.554Y6.846Z25.011A39.759
    N440X-.702Y6.968Z25.009A40.254
    N450X-.912Y7.126Z25.004A40.835
    N460X-1.195Y7.32Z24.992A41.528
    N470X-1.139Y8.95F1500.
    N480X-.861Y10.296Z25.003A40.895F677.5
    N490X-.643Y11.643Z25.01A40.26
    N500X-.419Y12.658Z25.015A39.561F967.5
    N510X-.188Y14.012Z25.018A38.624F981.
    N520X-.042Y15.197Z25.019A37.796F995.9
    N530X.07Y16.551A36.84F1008.6

    and G code with G93:

    (PROGRAM NAME - MASTERCAM TEST 21)
    (6 SPHERICAL / BALL-NOSED ENDMILL TOOL - 1 DIA. - 6.)
    N100T1M6
    N110S2000M3
    N120G0G90X-2.5Y26.929Z38.538A26.202
    N130Y27.221Z34.866
    N140G1Y28.015Z24.898F0.
    N150X-1.748Y26.896Z24.958F1000.
    N160X-.783Y25.56Z25.005
    N170G93X-.166Y24.5Z25.016A26.352F792.5
    N180X.147Y23.654A26.769F1020.6
    N190X.483Y22.639Z25.013A27.259F866.
    N200X.813Y21.453Z25.005A27.817F759.3
    N210X1.164Y19.757Z24.993A28.592F546.1
    N220X1.366Y18.569Z24.984A29.125F790.4
    N230X1.516Y17.209Z24.976A29.721F704.3
    N240X1.585Y15.849Z24.972A30.306F715.1
    N250X1.596Y14.659Z24.971A30.814F824.4
    N260X1.636Y13.294Z24.968A31.196F724.6
    N270X1.612Y12.271Z24.969A31.481F972.2
    N280X1.517Y10.905Z24.973A31.859F731.6
    N290X1.36Y9.54Z24.981A32.236F732.6
    N300X1.081Y7.92Z24.992A32.684F616.4
    N310X.818Y7.717Z25.001A33.291F4923.5
    N320X.602Y7.531Z25.007A33.853F5310.6
    N330X.426Y7.362Z25.009A34.382F5621.2
    N340X.284Y7.21A34.896F5793.6
    N350X.168Y7.075Z25.008A35.409F5786.7
    N360X.071Y6.958Z25.007A35.939F5604.6
    N370X-.014Y6.857Z25.005A36.499F5294.1
    N380X-.092Y6.773A37.103F4916.6
    N390X-.205Y6.716A37.79F5125.3
    N400X-.295Y6.695Z25.007A38.37F6074.9
    N410X-.372Y6.709Z25.008A38.866F7119.
    .
    .



    Any help would be appreciated. I also attached a screenshot where I can set the output format for feedrate, maybe I have something wrong here. If I forgot to mention something I will reply as quick as possible.

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    Attached Thumbnails Attached Thumbnails Jerky movement with Mach3 and Mastercam-screenshot_1-png   Jerky movement with Mach3 and Mastercam-screenshot_66-png  


  2. #2
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    Default Re: Jerky movement with Mach3 and Mastercam

    Do you have "exact stop" turned on in mach 3? Exact stop can cause pauses in movement.



  3. #3
    Member Mecanix's Avatar
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    Default Re: Jerky movement with Mach3 and Mastercam

    Hard to say, can you post the init header of your program?
    Are you calling G64 from code with a few lookahead lines set-up (100 to 200 lines?)



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Jerky movement with Mach3 and Mastercam

Jerky movement with Mach3 and Mastercam

Jerky movement with Mach3 and Mastercam