G76 Problem on SMX3100
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  1. #1
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    Default G76 Problem on SMX3100

    I am having trouble getting a G76 cycle to work. I am trying to produce a 1.250-16UN-2A external thread.

    I am running the tool above the workpiece until I’m happy. At the moment the tool is coming down to the first cut diameter and then running back and forward to the Z depth but without lifting up on the diameter or changing diameter at all.

    I have compared my program with previous proven programs and it has the same code. I am not sure what is going wrong this time.

    I have a screenshot of the code which I will try and post. Any help would be much appreciated. On the SMX3100 the P and Q values on the second G76 line have an extra digit than normal. This is correct on this machine.

  2. #2
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    Default

    image2.jpg

    This is the program that isn't working.

  3. #3
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    Default

    image1.jpg

    This is an existing working program.

  4. #4
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    Quote Originally Posted by craigsmith1985 View Post
    image2.jpg

    This is the program that isn't working.
    Hello Craig,
    Actually list your two program examples as text in your post, so that the program is legible.

    Regards,

    Bill

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    Default

    code not working

    n11
    m5p11
    m6t52052(1.250-16un-2a thread insert)
    t54000
    g400 b0. J1
    (1.250 16un-2a (1))
    m34
    g97 s400 m3 p11
    g99
    g54 g99 g80 g40 g00 y0 z5.
    M126
    x130.32
    z1.792
    g76 p000060 q50 r0.
    G76 x29.614 z-24.275 p10681 q2000 f1.587
    g0 x130.32
    m127
    g28 u0.0 v0.0
    g28 w0.0
    m01

    code working

    n70(10369010 - rh ext threading tool - 16er p2.0 iso - ic908)
    m6t36036(10369010 - rh ext threading tool - 16er p2.0 iso - ic908)
    (ztd68)
    t77000(preselect)

    m01
    g28v0.u0.
    G28w0.
    G400b0.j1
    m34
    m24
    g50s3500
    g97s400m3p11
    m90
    g54g0g40g99z20.0m8
    x90.0
    z5.0
    (turn thread)
    x92.0z3.577
    g76p020060q500r0.05
    g76x87.546z-24.0p12270q3067(q4000)f2.0
    g28u0.m9
    g28w0.
    G0b-90.
    M5p11
    m01

  6. #6
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    Quote Originally Posted by craigsmith1985 View Post
    code not working

    ...
    g76 p000060 q50 r0.
    ...
    I didn't read the whole thing, but this immediately stands out as incorrect.

    The first two digits in Pxxxxxx are the number of finish passes. I'm not sure if zero is valid for that, but it probably doesn't affect the cycle.

    The R in the same line is the finish allowance. It shouldn't be zero. That's probably the reason for the not retracting.

    The Q in that line is the first pass DOC, I'd say you've missed a zero on the end of it. Again, shouldn't stop the cycle from working properly though.

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    Default

    It worked fine this morning after turning the machine off and on again. I guess that old trick really does work sometimes.


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