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IndustryArena Forum > MetalWorking Machines > Haas Lathes > Haas Fanuc-style G71 - G76 cycles...
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  1. #1
    Gold Member
    Join Date
    Mar 2003
    Posts
    2919

    Haas Fanuc-style G71 - G76 cycles...

    Anyone ever used 2-line Fanuc-style multiple repetitive cycles (G71 - G76) on a Haas lathe? I've run into a customer who swears up and down they work, and what's more, he uses 2-line and 1-line cycles in the same program! I'm wondering if this is a common practice???

    G72 Unnnn Rnnnn
    G72 P101 Q102 Unnnn Wnnnn Fnnnn Snnnn
    N101
    ...
    ...
    ...
    N102
    G71 P103 Q104 Unnnn Wnnnn Dnnnn Fnnnn Snnnn
    N103
    ...
    ...
    ...
    N104
    M30

  2. #2
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    Join Date
    Apr 2006
    Posts
    4

    2 line & 1 line format g71 type I and type II format

    note the skip lines in the first example ... when program is ran with skip off ir will run the g71 cycle ... with skip (block delete) on it will only run the finish pass ... this is a big time saver when setting up. Method would be to offset x up double the finish allowance (.05X2=.100) run once with skip off, then program out the taper ... run the second time with skip on checking for taper correction. If the there is no taper offset down to make the tool cut to the correct print dimention ... if the tool setting was correct this will be another .05 or so depending on tool pressure. Run the cycle for the third time again with skip on and you should have a correct part. Note again thet the second and third time the cycle is ran it only takes a finish pass exactly like it would in the G70 line.

    (80 DEG)

    N100
    T303
    G00G40
    G50S2800M08
    G96S280M03
    G00X0.75Z1.
    G41Z0.
    G01X-0.06F0.005
    Z0.05
    G00G40X0.715Z0.15
    /G71U0.06R0.03
    /G71P101Q102U0.05W0.002S280F0.008
    N101G00X0.21
    G42Z0.1
    G01X0.52Z-0.06F0.006
    X0.53Z-0.41
    Z-0.495
    N102X0.8
    /G70P101Q102
    G00G40Z5.M09
    T300
    M01
    M31
    (80 DEG. O.D. TOOL)
    N100
    T303
    G00G40
    G50S1200M08
    G96S600M03
    G00X6.65Z1.
    Z0.16
    /G72W0.04R0.03
    /G72P101Q102U0.W0.04S600F0.01
    N101G00G41Z0S900
    G01X1.F0.006
    N102Z0.16
    /G70P101Q102
    G00G40X6.65Z0.15
    /G71U0.1R0.03
    /G71P103Q104U0.1W0.002S900F0.01
    N103G00X5.899S900
    G42Z0.1
    G01Z0.F0.006
    G03X5.999Z-0.05R0.05
    G01Z-0.95
    N104X6.65
    /G70P103Q104
    G00G40Z1.M09
    G00Z10.
    T300
    M01


    single line format type II

    (ROUGH GROOVE WAM.015R STRIGHT TOOL)
    N300
    G28 U0
    T505
    G54 G50 S1000
    G97 M03 S500
    G96 S400
    / M08
    G00 X1.66 Z-0.19
    G71 P301 Q302 D0.01 U0.005 W0.002 F0.002
    N301 G01 G42 Z-0.2049 X1.5748 F0.009
    X1.545 Z-0.2285 F0.002
    G02 X1.4355 Z-0.31 R0.088
    G02 X1.545 Z-0.3915 R0.088
    G01 X1.5748 Z-0.4151
    X1.65
    N302 G40 X1.75 F0.02
    G00 Z3. X3.
    G28 U0
    T500 M01


    N101 (ROUGH O.D.)
    N102 G28 (Return to Machine Home reference point)
    N103 T101 (55 Deg. O.D. TOOL x .0312 TNR)(Select tool 1, offset 1)
    N104 G50 S2500
    N105 G97 S591 M03
    N106 G54 G00 X2.1 Z0.1 M08 (Rapid to start point)
    N107 G96 S325
    N108 Z0.005
    N109 G01 X-0.063 F0.01
    N110 G00 X2.1 Z0.1
    N111 G71 P112 Q124 U0.02 W0.005 D0.1 F0.012 (Rough P to Q using G71 and TNC)
    (Define part path PQ sequence)
    N112 G42 G00 X0.55 Z0.1 (P) (G71 Type II, TNC approach)
    N113 G01 Z0. F0.004
    N114 X0.65
    N115 X0.75 Z-0.05
    N116 Z-0.75
    N117 G02 X1.25 Z-1. R0.25
    N118 G01 Z-1.5
    N119 Z-1.72 X1. F0.006
    N120 G01 Z-2.5
    N121 G02 X1.25 Z-2.625 R0.125
    N122 G01 Z-3.5 F0.004
    N123 X2. Z-3.75 F0.008
    N124 G40 G00 X2.1 (Cancel TNC Departure move)
    N125 G97 S591
    N126 M09
    N127 G28 (Return to Machine Home reference point)
    N128 M01

  3. #3
    Gold Member
    Join Date
    Mar 2003
    Posts
    2919
    So... your're saying you DO run single-line and double-line roughing cycles in the same program?

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