Need Help! 2 axis profiling with contour ramping weird path


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Thread: 2 axis profiling with contour ramping weird path

  1. #1
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    Default 2 axis profiling with contour ramping weird path

    With BobCAD-CAM V28, I just discovered something weird at the end of 2 axis profiling with contour ramping (for a circular contour).
    If the "total depth" is not a multiple of "depth of cut", I get dangerous arc move at the end of the operation, just before the last arc move with constant Z.
    For example, 2.1mm depth, depth of cut 0.25mm, here is the GCODE, with the weird move in red color:

    Code:
    ************* 64 - Feed moves//Arc move XY**********
    G17 G3 X-15.371 Y11.168 Z-2.100 R19.000
    ************* 64 - Feed moves//Arc move XY**********
    G17 G3 X19.000 Y.000 R19.000 F552.
    ************* 64 - Feed moves//Arc move XY**********
    G17 G3 X-15.371 Y11.168 R19.000
    ************* 50 - Rapid moves//Rapid move Z **********
    G0 Z5.080
    ************* 71 = Operations//End of operation **********
    ************* 50 - Rapid moves//Rapid move Z **********
    G0 Z25.400
    ************* 5 - Ending blockes//End of program **********
    O100 endif
    M5
    M30
    NC Corrector display of the GCODE



    This move makes the tool colliding with the workpiece.
    Not visible on BC display or in the simulation, as below.



    So that looks like a postprocessor issue.
    Any idea ?

    Thanks.
    Frederic

    Similar Threads:
    Attached Thumbnails Attached Thumbnails 2 axis profiling with contour ramping weird path-bc_test-png   2 axis profiling with contour ramping weird path-bc_test2-png  
    http://cnc.f1oat.org/


  2. #2
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    Default Re: 2 axis profiling with contour ramping weird path

    Looks like I have solved the issue by changing line 222 in the postprocessor.
    I was using "e" option. That is better with "b"

    Code:
    222. Arc center a=absolute, b=incremental, d=unsigned inc., e=radius? b
    Now the generated code is
    Code:
    G17 G3 X-15.371 Y11.168 Z-2.100 I-19.000 J.000
    G17 G3 X19.000 Y.000 I15.371 J-11.168 F552.
    G17 G3 X-15.371 Y11.168 I-19.000 J.000


    Attached Thumbnails Attached Thumbnails 2 axis profiling with contour ramping weird path-2017-11-26-16_44_50-nc-corrector-p__cnc_projects_tests_bobcad  
    http://cnc.f1oat.org/


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2 axis profiling with contour ramping weird path

2 axis profiling with contour ramping weird path