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  1. #1
    Join Date
    Jan 2012
    Posts
    13

    Threading without canned cycle

    I have metric thread coming up using some material that's hard to get. I used the vardex thread turning program to program it, because I'm hesitant to do all the conversions myself and use a g76 cycle. The problem is I've never really used g-code that individually programs every pass. Here is the output:

    PassNo Depth, inch Acc.depth, inch Accumulated. Z, inch D, inch
    P1 0.0121 0.0121 -0.0036 2.6883
    P2 0.0100 0.0221 0.0022 2.7083
    P3 0.0091 0.0312 -0.0031 2.7265
    P4 0.0070 0.0382 0.0009 2.7406
    P5 0.0059 0.0441 -0.0025 2.7524
    P6 0.0052 0.0493 0.0005 2.7628
    P7 0.0047 0.0540 -0.0022 2.7722
    P8 0.0043 0.0583 0.0003 2.7809
    P9 0.0040 0.0624 -0.0020 2.7889
    P10 0.0038 0.0662 0.0002 2.7965
    P11 0.0036 0.0697 -0.0019 2.8036
    P12 0.0034 0.0731 0.0001 2.8104
    P13 0.0033 0.0764 -0.0018 2.8169
    P14 0.0031 0.0795 0.0000 2.8232
    P15 0.0030 0.0825 -0.0017 2.8292
    P16 0.0029 0.0854 0.0000 2.8350
    P17 0.0028 0.0882 -0.0016 2.8406
    P18 0.0027 0.0909 0 2.8460

    My plotter gives me a syntax error I was wondering what I had to had in order to get this to run on a Fanuc controller. Is there a g code I need to preface this with?

    EDIT: For reference it is an internal M72 x 4 thread.

  2. #2
    Join Date
    Aug 2011
    Posts
    2517
    You can use G92

    G92 X (1st cut) Z (end point) F (feed/lead)
    X (2nd cut)
    X (3rd cut)
    X (4th cut)
    X (5th cut)
    etc etc etc

  3. #3
    Join Date
    Jul 2010
    Posts
    369
    Standard Fanuc single step threading......


    Generic Code:

    N1000
    G00G54G97T0404M04
    G50S625
    X2.9346Z0.0
    M41
    G97S0625
    G00X2.8326Z-0.0821
    G1X2.9294
    G32Z-3.0F0.25
    G00X2.8326
    Z-0.1564
    G01X3.0152
    G32Z-3.0F0.25
    G00X2.8326
    Z-0.224
    G01X3.0933
    G32Z-3.0 F0.25
    G00X2.8326
    Z-0.2859
    G01X3.1648
    G32Z-3.0F0.25
    G00X2.8326
    Z-0.3427
    G01X3.2304
    G32Z-3.0F0.25
    G00X2.8326
    Z-0.375
    G01X3.2677
    G32Z-3.0F0.25
    G00X2.8326
    X2.8346Z5.0
    X10.0
    G97
    G30U0W0
    M01
    M30

    Another Example: (Reverse JIS Spec.)
    %
    :0001
    G00T0404
    M42
    G97S0625M04
    X-2.9346Z0.0
    G00X-2.8326Z-0.0821
    G01X-2.9294
    G32Z-3.0.F0.25
    G00X-2.8326
    G00Z-0.1564
    G01X-3.0152
    G32Z-3.0F0.25
    G00X-2.8326
    G00Z-0.224
    G01X-3.0933
    G32Z-3.0F0.25
    G00X-2.8326
    G00Z-0.2859
    G01X-3.1648
    G32Z-3.0F0.25
    G00X-2.8326
    G00Z-0.3427
    G01X-3.2304
    G32Z-3.0F0.25
    G00X-2.8326
    G00Z-0.375
    G01X-3.2677
    G32Z-3.0F0.25
    G00X-2.8326
    G00X-2.8346Z5.0
    G00X-10.0
    G28U0W0
    T0400
    M05
    M30



    Good Luck:cheers:

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