Need Help! Fanuc alarm 021 when live tool interpolation

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Thread: Fanuc alarm 021 when live tool interpolation

  1. #1
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    Default Fanuc alarm 021 when live tool interpolation

    Hi,
    Im new to live tool lathe but i managed to run some parts using Fusion 360, but one thing that bothers me is when i try to do a helical movement in Z plane the machine alarms out (Alarm 021 Illegal plane axis command). I tried everything but it wont work. Only thing i can do is have the Post processor write the code in lines= Huge program

    Same thing if using C X Z axis as when using X Y Z axis.

    This is the beginning of the code that doesn´t work: (at line N201 it throws the alarm)

    N41 G28 U0. V0.
    N51 G28 W0.
    N61 M90
    N71 G54
    N81 G98 G18 M35
    N91 G0 G28 H0.
    N101 T1212
    N111 M8
    N121 G97 S3500 M33
    N131 G0 Z15.
    N141 X7.598 Y0.
    N151 C0.
    N161 G12.1
    N171 G1 X-0.791 C-3.779 F800.
    N181 Z5.
    N191 Z2.55
    N201 G3 X6.942 C1.548 Z2.272 I0.396 J3.779 F320.

    This is the code that works:
    N41 G28 U0. V0.
    N51 G28 W0.
    N61 M90
    N71 G54
    N81 G98 G18 M35
    N91 G0 G28 H0.
    N101 T1212
    N111 M8
    N121 G97 S3500 M33
    N131 G0 Z15.
    N141 X7.598 Y0.
    N151 C0.
    N161 G12.1
    N171 G1 X-0.791 C-3.779 F800.
    N181 Z5.
    N191 Z2.55
    N201 X-0.299 C-3.796 Z2.541 F320.
    N211 X0.193 C-3.798 Z2.533
    N221 X0.685 C-3.784 Z2.524

    The machine is a Daewoo Puma 2000Y -2002 w, Fanuc 18. If anyone have any idea to make this work it would be great.

    Thanks
    /Johan

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  2. #2
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    Default Re: Fanuc alarm 021 when live tool interpolation

    It might be that the I and J in your G3 move need to be I and K. J is a Y axis qualifier. K is for Z. In an arc move, I J and K are all Incremental distance with sign from start point of arc to center of arc.

    On 2nd though, I'm trying to picture this move in my head, and I'm thinking why can't this be a G1 move with 3 axis simultaneous? With all three moving at once, a G1 will give you a helical groove.

    Ha-ha... on 3rd thought, this is a Y axis lathe. This move might be a little beyond my semi newb lathe status. :-)

    Perhaps select a different plain? (G17-G18-G19)

    Last edited by the_gentlegiant; 09-10-2020 at 05:54 PM.


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Fanuc alarm 021 when live tool interpolation

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Fanuc alarm 021 when live tool interpolation