Example 3: TNC with a G72 Roughing Canned Cycle

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This example is TNC with a G72 roughing canned cycle. G72 is used instead of G71 because the roughing strokes in X are longer than the Z roughing strokes of a G71. It is therefore more efficient to use G72.

TNC G72 Roughing Canned Cycle

Setting 33 is FANUC.

% o30721 (TNC WITH A G72 ROUGHING CYCLE) ; (G54 X0 is at the center of rotation) ; (Z0 is on the face of the part) ; (T1 is an OD cutting tool) ; (BEGIN PREPARATION BLOCKS) ; T101 (Select tool and offset 1) ; G00 G18 G20 G40 G80 G99 (Safe startup) ; G50 S1000 (Limit spindle to 1000 RPM) ; G97 S500 M03 (CSS off, Spindle on CW) ; G00 G54 X3.1 Z0 (Rapid to 1st position) ; M08 (Coolant on) ; (BEGIN CUTTING BLOCKS) ; G96 S200 (CSS on) ; G72 P1 Q2 U.01 W.005 D.08 F.012 (Begin G72) ; N1 G41 G00 Z-1.6 (P1 - TNC on) ; G01 X2. F0.01 (Begin toolpath) ; X1.4 Z-0.9 (Taper) ; X1. (Linear feed) ; Z-0.6 (Linear feed) ; G03 X0.8 Z-0.5 R0.1 (Feed CCW) ; G01 Z-0.1 (Linear feed) ; X0.7 Z0 (Chamfer, End of toolpath) ; N2 G00 G40 Z0.1 (Q2 - TNC off) ; (BEGIN COMPLETION BLOCKS) ; G97 S500 (CSS off) ; G53 X0 M09 (X home, coolant off) ; G53 Z0 M05 (Z home, spindle off) ; M30 (End program) ; %

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