Problem Peck tapping


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Thread: Peck tapping

  1. #1
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    Default Peck tapping

    Hi there,

    The machine is :

    Fadal VMC-15
    Model #: 914-15
    Year of mfg: 1997
    Serial #: 9708670

    The controller: CNC 88HS
    Format 1

    I have a weird problem.

    I made tens of thousands tapped holes without any trouble using the following code:

    ... Code for drilling........
    ...Code for tapping...
    ( TAP 1/4- 20 )
    M6T2
    G0G90S1000.1M5G80M90
    G8
    G84.2
    H2M8Z2.
    G84.1G99R+0.6Z-1.0F1000.1Q0.05X0Y0
    G80
    G98
    M9M5
    G0Z2.
    Y4.
    ...the rest of program.....

    Then I wanted to do instead continuous (as above) more forgiving peck tapping in steps 0.25”.

    So I searched the Internet and found that all I have to do is add additional lines for Z increments.
    So my tapping code would look like:

    G84.1G99R+0.6Z-0.25F1000.1Q0.05X0Y0
    Z-.50
    Z-.75
    Z-1.0
    G80
    G98
    M9M5
    G0Z2.
    Y4.
    ...the rest of program.....

    When executing the program my spindle goes down only once to 0.25” then ignores the tree additional
    lines and the executes the rest.
    I tried adding R0 values on lines with Z values with the same effect.

    So I tried rewrite the program:
    G84.1G99R+0.6Z-0.25F1000.1Q0.05X0Y0
    X0Y0Z-.50
    X0Y0Z-.75
    X0Y0Z-1.0
    G80
    G98
    M9M5
    G0Z2.
    Y4.
    ....the rest of program.....

    When executing the program my spindle also goes down only once to 0.25” then ignores the tree
    additional lines and then executes the rest.

    I made a long shot and rewrote the program again changing the X value only 0.00001”(ten millionths).
    This should not make any detectable measurable difference.

    To:
    G84.1G99R+0.6Z-0.25F1000.1Q0.05X0Y0
    X0.00001Y0Z-.50
    (went back to X=0)
    X0Y0Z-.75
    (and then went back to X=0.00001)
    X0.00001Y0Z-1.0
    G80
    G98
    M9M5
    G0Z2.
    Y4.
    …....the rest of program.....

    To my surprise the program was executed properly making all four pecks.
    The thread looks OK.
    Then I changed X value only 0.000001 (one millionth).
    Program also executed properly.


    Big question:
    Why my controller does not execute peck cycles while X and Y do not change?
    What is proper programing for peck tapping on CNC 88HS.

    Voytek

    Similar Threads:
    Last edited by voytek1; 12-05-2016 at 08:12 PM.


  2. #2
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    Default Re: Peck tapping

    Try a M45 after the secondary Z values



  3. #3
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    Default Re: Peck tapping

    Thanks adaprecision,

    It works.
    In addition I have to use M45 after all next pecks.
    So my program looks like this:

    ….... Code for drilling........
    ( TAP 1/4- 20 )
    M6T2
    G0G90S1000.1M5G80M90
    G8
    G84.2
    H2M8Z2.
    G84.1G99R+0.6Z-0.25F1000.1Q0.05X0Y0
    Z-0.5
    M45
    Z-0.75
    M45
    Z-1.0
    M45
    G80
    G98
    M9M5
    G0Z2.
    Y4.
    …....the rest of program.....


    It also works like this which is more understandable:

    ….... Code for drilling........
    ( TAP 1/4- 20 )
    M6T2
    G0G90S1000.1M5G80M90
    G8
    G84.2
    H2M8Z2.
    G84.1G99R+0.6Z-0.25F1000.1Q0.05X0Y0
    ( Execute the same routine: “M45” but at new Z :“Z-0.5”)
    M45Z-0.5
    ( Execute the same routine: “M45” but at new Z: “Z-0.75”)
    M45Z-0.75
    ( Execute the same routine: “M45” but at new Z: “Z-1.0”)
    M45Z-1.0
    G80
    G98
    M9M5
    G0Z2.
    Y4.
    …....the rest of program.....

    I guess I never new about code M45 even though it is in my User's Manual.
    Thanks again.



    Voytek



  4. #4
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    Default Re: Peck tapping

    Your welcome! Glad I could help.



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