G76 Taper threading I value


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Thread: G76 Taper threading I value

  1. #1
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    Default G76 Taper threading I value

    Hi all,

    I'm trying to do some taper threading with my ST20Y. I think I've got it mostly figured out except for the "I" value. I'm trying to make 1 1/4" 11.5 NPT threads for a guy doing some rural water well services. This is the code I have so far. I put question marks by the "I" value. How do I figure "I" for different threads in the future? Thanks

    BTW there's a facing operation before this that has all the G20 yada yada.

    (TOOL - 1 OFFSET - 1)
    (OD THREAD RIGHT INSERT - NONE)
    G00 T0101
    G18
    G97 S200 M3
    G00 G54 X1.889 Z.2238
    G99
    G76 X1.6267 Z-1.0085 I??? K0.0696 D0.022 A60 P2 F0.0870
    G80
    G28
    T0100
    M30

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  2. #2
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    Default Re: G76 Taper threading I value

    I think I have my X value wrong as well. That's the diameter at the end closest to the chuck. I think it needs to be the diameter at the beginning of the thread?



  3. #3
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    Default Re: G76 Taper threading I value

    The I-value is the incremental change in diameter as the tool cuts the thread pass. It's not just the thread angle, instead you have to trig it out based on the distance from the starting Z to the target Z.
    For your reference, NPT threads have an angle of 1 degree 47 minutes. (1.7833 degrees).



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    Default Re: G76 Taper threading I value

    Good ol trig. Thanks



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G76 Taper threading I value
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