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CV and G02 / G03

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  • Per-Erik
    Hello Is CV (Constant Velocity) treated differently for these two G-codes. I have a smooth curve running twice - first run with G2 and the second run with G3
    Message 1 of 3 , Jul 31 2:52 PM
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      Hello

      Is CV (Constant Velocity) treated differently for these two
      G-codes. I have a smooth curve running twice - first run with G2 and
      the second run with G3 (oposite direction). CV is set to "Stop CV on angle > 90 degrees).
      The G3 code goes at full speed while G2 behaves as running Exact Stop - very jerky motion.
      If I turn of "Stop CV on angle", G2 is OK as well.
      If I set e.g. "Stop CV on angle > 340", G2 is also OK.
      Could this be something with a "negative" angle?

      Running Mach R3.042.038

      Regards
      Per-Erik
      www.hoddo.net
    • Ger
      I ve seen this as well when going from a G1 into a tangent arc, but never checked if it was a G2 or G3. Gerry ... From: Per-Erik To:
      Message 2 of 3 , Jul 31 4:29 PM
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        I've seen this as well when going from a G1 into a tangent arc, but never
        checked if it was a G2 or G3.

        Gerry


        ----- Original Message -----
        From: "Per-Erik" <peh@...>
        To: <mach1mach2cnc@yahoogroups.com>
        Sent: Saturday, July 31, 2010 5:52 PM
        Subject: [mach1mach2cnc] CV and G02 / G03


        > Hello
        >
        > Is CV (Constant Velocity) treated differently for these two
        > G-codes. I have a smooth curve running twice - first run with G2 and
        > the second run with G3 (oposite direction). CV is set to "Stop CV on angle
        > > 90 degrees).
        > The G3 code goes at full speed while G2 behaves as running Exact Stop -
        > very jerky motion.
        > If I turn of "Stop CV on angle", G2 is OK as well.
        > If I set e.g. "Stop CV on angle > 340", G2 is also OK.
        > Could this be something with a "negative" angle?
        >
        > Running Mach R3.042.038
        >
        > Regards
        > Per-Erik
        > www.hoddo.net
        >
        >
        >
        >
        > ------------------------------------
        >
        > www.machsupport.com - Web site AccessYahoo! Groups Links
        >
        >
        >
      • Per-Erik
        Thanks Gerry, Then I m not alone and you re right about G1 in head of G2. G3 operations are always correct as far as I can see. One of the G2-curves locks like
        Message 3 of 3 , Aug 1, 2010
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          Thanks Gerry,

          Then I'm not alone and you're right about G1 in head of G2.
          G3 operations are always correct as far as I can see.

          One of the G2-curves locks like this:

          N0660 X20.0000 Y10.4981
          N0670 G02 X20.5000 Y9.9981 I-0.0000 J-0.5000
          N0680 G01 Y3.7327
          N0690 X20.4977 Y0.9312
          N0700 G02 X20.4885 Y0.8360 I-0.5000 J0.0004
          N0710 G01 X20.4413 Y0.5934
          N0720 G02 X20.4031 Y0.4765 I-0.4908 J0.0956
          N0730 G01 X20.3007 Y0.2583
          N0740 G02 X20.2374 Y0.1571 I-0.4526 J0.2125
          N0750 G01 X20.0876 Y-0.0288
          N0760 G02 X20.0033 Y-0.1113 I-0.3893 J0.3137
          N0770 G01 X19.8141 Y-0.2569
          N0780 G02 X19.7113 Y-0.3180 I-0.3050 J0.3962
          N0790 G01 X19.4905 Y-0.4156
          N0800 G02 X19.3723 Y-0.4512 I-0.2022 J0.4573
          N0810 G01 X19.1278 Y-0.4929
          N0820 G02 X19.0431 Y-0.5000 I-0.0840 J0.4929
          N0830 G01 X4.5455 Y-0.4804
          N0840 G00 Z2.0000

          BTW - The code comes from SheetCam.

          Rgds
          Per-Erik
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