Lathe G72 Last Roughing Pass Is 0.021 Away From Part
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  1. #1
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    Default Lathe G72 Last Roughing Pass Is 0.021 Away From Part

    I got a ST-20 using G72 and G70 to face a beveled profile using G41 and Tool Tip #3.
    On the last roughing pass on a facing operation the tool in "Z" is 0.0206 away then the finish tool finish does its job.

    Its got to be a setting that is doing this.

    Just for reference here is the program

    G54
    G28 U0 W0
    T1010 (Rough Face)
    G50 S1000
    G97 S407 M03
    N105 G00 X3.1 Z0.15 M08
    N106 G96 S330
    N107 G72 P108 Q111 U0.01 W0.005 D0.035 F0.003
    N108 G41 G01 X3. Z-0.062
    N109 G01 X2.876 Z0.
    N110 G01 X0.
    N111 G40 G00 Z0.15
    N112 G97 S407 M09
    N113 G28 U0 W0
    N114 T909 (FINISH FACE)
    N115 G50 S1200
    N116 G97 S493 M03
    N117 G00 X3.1 Z0.1 M08
    N118 G96 S400
    N119 G70 P108 Q111 F0.003
    G00 Z0.15
    G97 S493
    G28 U0 W0 M09
    M30

    Thanks,
    Any help would be appreciated.

  2. #2
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    Default

    There is a possibility my tool tip should be #2, not #3.
    I will check on that Monday.
    If someone can confirm that would be great.

  3. #3
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    Default

    Not sure about Haas but if i was programming a G72 on a Fanuc i would do that like:
    N108 G0 Z-0.062
    N109 G01 x3.
    N110 X2.876 Z0.
    N111 X0.

    Turn G41 on for the finishing pass only.

  4. #4
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    Default

    I found the problem.
    It is tool tip #3, not #2.
    When I double checked the setting it said #0, my bad.
    Changed it to #3 and all was perfect.


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