G-Code programming the Fanuc 20T control.
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  1. #1
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    Default G-Code programming the Fanuc 20T control.

    A shop in NC bought a lathe with the Fanuc 20T, they have no CNC experience at all and ask me for advice.
    I have trained shops on Fanuc lathes and mills for many years, but I did not know there even was a 20T control.
    They need help, any example of a typical face-turn lathe part would be greatly appreciated.
    Any knowledge at all will help.
    Heinz.

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    Quote Originally Posted by Heinz R. Putz View Post
    A shop in NC bought a lathe with the Fanuc 20T, they have no CNC experience at all and ask me for advice.
    I have trained shops on Fanuc lathes and mills for many years, but I did not know there even was a 20T control.
    They need help, any example of a typical face-turn lathe part would be greatly appreciated.
    Any knowledge at all will help.
    Heinz.
    Hello Heinz,
    The 20T control uses the same Syntax as any other Fanuc control circa that time. The only significant difference in the Syntax and Format of various Fanuc controls is when Offset Programming was introduced to set the Coordinate System and the two line Format for Multi-repetitive cycles. Accordingly, I'm sure you would have many program examples for other controls such as 16T and onward. The 20T uses the two line Format for Multi-repetitive cycles (Standard FS16 Format).

    I believe the 20T control was not sold in the US and that any examples there would have been bought from other countries. I believe also that the FS20 control was only offered as a two axis control.


    Regards,

    Bill

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    I just walked over and took a look at a 18-T it uses work shift, geometry, wear and two line canned cycles. What else could be different. I'd lay odds it'll run a 18-T programs. Can't say as if I've ever heard of the 20-T myself either?

    Maybe get them to turn it on and see if anything is in the directory take some pictures of programs just to kinda give you a look at them. Really I can't imagine what would be so different? The addition of G54-G59 Maybe?

    Brent

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    There was an F20MA version. Makino offered that on their KE55 toolmaker mill. In fact a recent PM thread covered one...

    Makino KE55 overtravel

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    Quote Originally Posted by Heinz R. Putz View Post
    A shop in NC bought a lathe with the Fanuc 20T, they have no CNC experience at all and ask me for advice.
    I have trained shops on Fanuc lathes and mills for many years, but I did not know there even was a 20T control.
    They need help, any example of a typical face-turn lathe part would be greatly appreciated.
    Any knowledge at all will help.
    Heinz.

    A example of a turn program on a fanuc 20T
    %
    OFM1( FILENAME = FM1)
    N20 G20 G40
    N25 G28 U0
    N30 G28 W0
    ( OPERATION: ROUGH TURN TURN1 )
    N40 T101
    N45 G50 S3000
    N50 G96 S800 M4
    N55 G0 X2.19 Z0.0687 M8
    N60 G1 Z-0.5313 F0.04
    N65 X2.25
    N70 X2.2854 Z-0.5136
    N75 G0 Z0.0687
    N80 G1 X2.13
    N85 Z-0.5313
    N90 X2.19
    N95 X2.2254 Z-0.5136
    N100 G0 Z0.0687
    N105 G1 X2.07
    N110 Z-0.5313
    N115 X2.13
    N120 X2.1654 Z-0.5136
    N125 G0 Z0.0687
    N130 G1 X2.01
    N135 Z-0.5313
    N140 X2.07
    N145 X2.1054 Z-0.5136
    N150 G0 Z0.0687
    N155 G1 X1.95
    N160 Z-0.5313
    N165 X2.01
    N170 X2.0454 Z-0.5136
    N175 G0 Z0.0687
    N180 G1 X1.89
    N185 Z-0.5313
    N190 X1.95
    N195 X1.9854 Z-0.5136
    N200 G0 Z0.0687
    N205 G1 X1.83
    N210 Z-0.5313
    N215 X1.89
    N220 X1.9254 Z-0.5136
    N225 G0 Z0.0687
    N230 G1 X1.77
    N235 Z-0.5313
    N240 X1.83
    N245 X1.8654 Z-0.5136
    N250 G0 Z0.0687
    N255 G1 X1.71
    N260 Z-0.5313
    N265 X1.77
    N270 X1.8054 Z-0.5136
    N275 G0 Z0.0687
    N280 G1 X1.65
    N285 Z-0.5313
    N290 X1.71
    N295 X1.7454 Z-0.5136
    N300 G0 Z0.0687
    N305 G1 X1.59
    N310 Z-0.5313
    N315 X1.65
    N320 X1.6854 Z-0.5136
    N325 G0 Z0.0687
    N330 G1 X1.53
    N335 Z-0.5313
    N340 X1.59
    N345 X1.6254 Z-0.5136
    N350 G0 Z0.0687
    N355 G1 X1.47
    N360 Z-0.5313
    N365 X1.53
    N370 X1.5654 Z-0.5136
    N375 G0 Z0.0687
    N380 G1 X1.41
    N385 Z-0.5313
    N390 X1.47
    N395 X1.5054 Z-0.5136
    N400 G0 Z0.0687
    N405 G1 X1.35
    N410 Z-0.5313
    N415 X1.41
    N420 X1.4454 Z-0.5136
    N425 G0 Z0.0687
    N430 G1 X1.29
    N435 Z-0.5313
    N440 X1.35
    N445 X1.3854 Z-0.5136
    N450 G0 Z0.0687
    N455 G1 X1.23
    N460 Z-0.5313
    N465 X1.29
    N470 X1.3254 Z-0.5136
    N475 G0 Z0.0687
    N480 G1 X1.17
    N485 Z-0.5313
    N490 X1.23
    N495 X1.2654 Z-0.5136
    N500 G0 Z0.0687
    N505 G1 X1.11
    N510 Z-0.5313
    N515 X1.17
    N520 X1.2054 Z-0.5136
    N525 G0 Z0.0687
    N530 G1 X1.05
    N535 Z-0.5313
    N540 X1.11
    N545 X1.1454 Z-0.5136
    N550 G0 Z0.0687
    N555 G1 X0.99
    N560 Z-0.5313
    N565 X1.05
    N570 X1.0854 Z-0.5136
    N575 G0 Z0.0687
    N580 G1 X0.93
    N585 Z-0.5313
    N590 X0.99
    N595 X1.0254 Z-0.5136
    N600 G0 Z0.0687
    N605 G1 X0.87
    N610 Z-0.5313
    N615 X0.93
    N620 X0.9654 Z-0.5136
    N625 G0 Z0.0687
    N630 G1 X0.81
    N635 Z-0.5313
    N640 X0.87
    N645 X0.9054 Z-0.5136
    N650 G0 Z0.0687
    N655 G1 X0.75
    N660 Z-0.5313
    N665 X0.81
    N670 X0.8454 Z-0.5136
    N675 G0 Z0.0687
    N680 G1 X0.69
    N685 Z-0.5313
    N690 X0.75
    N695 X0.7854 Z-0.5136
    N700 G0 Z0.0687
    N705 G1 X0.63
    N710 Z-0.5313
    N715 X0.69
    N720 X0.7254 Z-0.5136
    N725 G0 Z0.0687
    N730 G1 X0.57
    N735 Z-0.5313
    N740 X0.63
    N745 X0.6654 Z-0.5136
    N750 G0 Z0.0687
    N755 G1 X0.51
    N760 Z-0.5313
    N765 X0.57
    N770 X0.6054 Z-0.5136
    N775 G0 Z0.1
    ( OPERATION: FINISH TURN TURN1 )
    N785 G0 X0.5
    N790 G50 S3000
    N795 G96 S1200
    N800 G0 X0.5 Z0.1 M8
    N805 G1 Z-0.5313 F0.02
    N810 X0.6856 Z-0.4384
    N815 G0 X2.45
    N820 G28 U0
    N825 G28 W0
    N830 M30
    %


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