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IndustryArena Forum > MetalWorking Machines > Fadal > Help with Z overtravel
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  1. #1
    Join Date
    Oct 2003
    Posts
    128

    Help with Z overtravel

    We have a Fadal 3016 w/cnc 88. Using Format 1. I have a problem with the Z axis hitting the limit (top) at the end of my program. My knowledge of this machine (and g code in general ) is pretty limited. In case it is related I do have the Z home position set .010 down from the upper limit. However I can't figure out the reason it is reaching the limit. I could understand if it was ignoring the tool offset, but shouldn't that still be in effect? Last few lines below:

    T5 M6 H5 (counter sink
    M3 S500
    M8
    G0 Z.250
    G81 X0.5845 Y-2.1843 R+0.2 Z-0.315 F4. G98
    Y-3.8093
    X3.397 Y-4.9968
    X5.8345 Y-4.6218
    Y-1.3718
    X3.397 Y-0.9968
    G80
    M9 M5


    Thanks!!
    Thanks
    Marc

  2. #2
    Join Date
    Jan 2004
    Posts
    3154
    I am a little confused with the end of your program.
    There is no "end of program" command or any return home command.
    M5M9 is spindle off and coolant off and I don't see any Z or home moves.
    I believe format 1 uses M2 for end of program.

    Here is the end of 1 of my format 2 programs.
    Should work for you as well if you change the M30 to M2.

    I haven't tried it without yet but I believe the Z0 is not needed here either as the G28 is return home. But double redundancy never hurts anything)


    N06028 M05M9
    N06030 G91G28Z.0
    N06032 G00G90E0X5.Y9.
    N06034 M19
    N06036 M30
    %
    www.integratedmechanical.ca

  3. #3
    Join Date
    Oct 2003
    Posts
    128
    Yes, I had removed the home command while trying to figure this out. Never thought about an end of program, wonder if that be the problem?
    Thanks
    Marc

  4. #4
    Join Date
    Mar 2003
    Posts
    900
    -

  5. #5
    Join Date
    Nov 2003
    Posts
    459
    Try this:

    G80M9
    G53Z0
    G53Y8.
    M2

    Advantage not leaving G90 or Absolute
    This prevents the constant re-stating of G90 after the G91G28Z0
    to get the Z axis to move up to the Machine 0
    G53Y8. Moves the table out to operater (Format 2 only)
    In Format 1 machine goes back to CS at end (useless)
    Scott_bob

  6. #6
    Join Date
    Apr 2005
    Posts
    1194
    I think the g53 will make the difference

    On one of our little 3016's we use format 2 and our programs would look like

    T5 M6 (counter sink
    M3 S500
    GOX#### Y#####
    Z.250 H5 M8
    G81 X0.5845 Y-2.1843 R+0.2 Z-0.315 F4. G98
    Y-3.8093
    X3.397 Y-4.9968
    X5.8345 Y-4.6218
    Y-1.3718
    X3.397 Y-0.9968
    G80
    G0Z.1
    M9 M5
    G0Z0
    M30

  7. #7
    Join Date
    Oct 2003
    Posts
    128
    Thanks for the help, added the following to the program and it works fine. Actually Bobcad plugged it in for me.

    G0 G80 G90 M5 M9 (end of program
    G53 Z0
    E0 X0 Y0 Z0 H0
    M30
    Thanks
    Marc

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