Need Help! Fanuc 21T G76 Improper G-Code


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Thread: Fanuc 21T G76 Improper G-Code

  1. #1

    Default Fanuc 21T G76 Improper G-Code

    Hello. I am completely green to posting a thread on this website so even though I've searched for the answer on this site and others, I have yet to come up with a solution. I've programmed 3 axis mill for awhile, but I'm learning CNC lathe all on my own here so please bare with me if this question has already been answered. I am running a Hardinge Cobra 42 Lathe with a Fanuc 21T control. I am using mastercam2018 with a "LATHE 2-AXIS SLANT BED" post. The machine is kicking a 010 alarm, "IMPROPER G-CODE" . Here is the program its posting:

    O0000
    G20
    G0 T0202
    M8
    G97 S300 M03
    G0 X.95 Z.2213
    G76 P010029 Q0 R0
    G76 X.6309 Z-1.63 P595 Q233 R0. F.1
    M9
    G28 U0. W0. M05
    T0200
    M30

    It has a G54 which I edit out because that causes the same alarm, but the G76 cycle looks correct compared to the sample program in the manual. When I go into MDI and type G76; it kicks the 010 alarm there too.

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  2. #2
    Member positiverake's Avatar
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    Default Re: Fanuc 21T G76 Improper G-Code

    You dont have the G76 option try a G71 in MDI and see if you get the same alarm



  3. #3
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    Default Re: Fanuc 21T G76 Improper G-Code

    Sounds like you dont have the option switched on some of the earlier ones never had it activated
    Try this
    O0000
    G20
    G0 T0202
    M8
    G97 S300 M03
    G0 X.95 Z.2213
    G92 X0.75 Z-1.63 F0.1 (START FROM MAJOR DIA OF THREAD)
    X0.72
    X0.70
    X0.650
    X0.6309
    X.6309 F.1
    M9
    G28 U0. W0. M05
    T0200
    M30



  4. #4
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    Default Re: Fanuc 21T G76 Improper G-Code

    May depend on g code type A,B or C as well.

    Sent from my SM-T813 using Tapatalk



  5. #5
    bilal7619344's Avatar
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    Default

    Dear Sir,
    I bought a Cobra 42 with 21I-TA, I lost parameters of that due to battery fail. Could you please help me?
    Email: 19010020@lums.edu.pk

    Best regards
    bilal



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Fanuc 21T G76 Improper G-Code

Fanuc 21T G76 Improper G-Code