G72 Cycle Examples for CNC Lathe

In this article, we wrote CNC Program Examples for CNC lathe with G72 Facing Cycle. There are different G72 Cycle examples for facing and turning, with or without G70 finishing cycle.

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G72 Facing Cycle

The G72 Facing Cycle is used in CNC Lathe machines for cutting parallel to the X-axis, in other words for facing (face turning) operations. The G72 Face Turning Cycle is one of the most commonly used CNC Turning cycles.

G70 Finishing Cycle

The G70 Finishing Cycle is used for finish cutting operations (final cleaning cutting) in CNC lathes. The G70 command is used to final cutting after any roughing cycles like G71, G72 or G73.

G72 Cycle Examples

Example – 1

In this example, we used G72 Canned cycle for stock removal in facing for CNC Lathe. We used G70 finishing cycle also for final cutting and it was same tool.

CNC Lathe facing example with G72 Canned cycle - 1
CNC Lathe facing example with G72 Canned cycle – 1
( Diameter designation, metric input )
N010 G00 X220.0 Z190.0 ;
N011 G00 X162.0 Z132.0 ;
N012 G72 W7.0 R1.0 ;
N013 G72 P014 Q019 U4.0 W2.0 F0.3 ;
N014 G00 Z59.5 F0.15 S200;
N015 G01 X120.0 Z70.0 ;
N016 Z80.0 ;
N017 X80.0 Z90.0 ;
N018 Z110.0 ;
N019 X36.0 Z132.0 ;
N020 G70 P014 Q019 ;
N021 X220.0 Z190.0 ;
N022 M30 ;

Example – 2

In this example, we used G72 Facing Cycle for stock removal in facing for CNC Lathe. We used G70 finishing cycle also for final cutting and it was different tool.

CNC Lathe facing example with G72 cycle - 2
CNC Lathe facing example with G72 cycle – 2
O2411;
N5 T0101;
N10 G50 S2500;
N15 G96 M4 S180;
N20 G0 X53 Z0 M8;
N25 G72 W2 R2;
N30 G72 P35 Q75 U0.6 W0.1 F0.25;
N35 G1 Z-42 F0.1;
N40 G1 X40;
N45 G1 Z-35;
N50 G1 X30 Z-25;
N55 G1 Z-14;
N60 G1 X29;
N65 G3 X25 Z-12 R2;
N70 G1 Z-5;
N75 G2 X15 Z0 R5;
N80 G0 X200 Z200;
N85 T0303;
N90 G0 X53 Z2 M8;
N95 G70 P35 Q75;
N100 G0 X200 Z200 M9;
N105 G28 U0 W0 M9;
N110 M30;

Example – 3

In this example, we used G72 Cycle for boring in CNC Lathe. We used G70 cycle also for final cutting and it was different tool.

G72 Cycle example for boring in CNC Lathe - 3
G72 Cycle example for boring in CNC Lathe – 3
Note : The hole drilled (28mm) before start to process.
O3551;
T0101;
G50 S2500;
G96 M4 S180;
G0 X102 Z2 M8;
G42 G1 X94 F0.25;
Z0;
G3 X98 Z-2 R2 F0.1;
G1 Z-26 F0.25;
G40 X100;
Z5;
G0 X26 Z0;
G72 W2 R1;
G72 P1 Q2 U-0,4 W0.2 F0.25;
N1 G1 G42 Z-70 F0.1;
X30;
Z-40;
X42;
X47 Z-27;
G2 X70 Z-9 R32.5;
G1 Z-4;
X78;
G2 X80 Z-3 R1;
G2 X15 Z0 R5;
N2 G1 Z2;
G40
G0 X200 Z200 M9;
T0303;
G97 M4 S3500;
G0 X26 Z2 M8;
G70 P1 Q2;
G0 X200 Z200 M9;
M30;

Example – 4

In this example, we used G72 canned cycle for face cutting in CNC Lathe. We used G70 cycle also for final cutting and we wrote it with same and different tool.

G72 canned cycle example for face cutting in CNC Lathe - 4
G72 canned cycle example for face cutting in CNC Lathe – 4
N10 G50 S2000 T0100 ;
G96 S180 M03 ;
G00 X85.0 Z5.0 T0101 ;
Z0 ;
G01 X-1.6 F0.2 ;
G00 X85.0 Z1.0 ;
G72 W2.0 R1.0 ;
G72 P12 Q14 U0.5 W0.2 F0.25 ;
N12 G00 G41 Z-51.0 ;
G01 X80.0 F0.2 ;
X78.0 W1.0 ;
X60.0 ;
Z-45.0 ;
X40.0 Z-15.0 ;
X30.0 ;
Z-1.0 ;
X26.0 Z1.0 ;
N14 G40 ;
G70 P12 Q14 ;
G00 X200.0 Z200.0 T0100 ;
M30 ;


If G70 finish cutting need different tool, replace above lines from G70 line with below.

G00 X200.0 Z200.0;
M01 ;
N16 G50 S2500 T0300 ;
G96 S200 M03 ;
G00 X85.0 Z5.0 T0303 ;
G70 P12 Q14 ;
G00 X200.0 Z200.0 T0300 ;
M30 ;

Example – 5

In this example, we used G72 Facing Cycle for face cutting in CNC Lathe. We wrote that program with single line (G72 Type 1 – for old series controller) and also with double line (G72 Type 2 – for new controller). We used G70 cycle also for final cutting and it was same tool.

G72 facing example for Fanuc old series and new series - 5
G72 facing example for Fanuc old series and new series – 5
N010 G00 X220.0 Z60.0 ;
N011 G00 X176.0 Z2.0 ;
N012 G72 W7.0 R1.0 ;
N013 G72 P014 Q021 U4.0 W2.0 F0.3 S550 ;
N014 G00 G41 Z-70.0 S700 ;
N015 X160.0 ;
N016 G01 X120.0 Z-60.0 F0.15 ;
N017 W10.0 ;
N018 X80.0 W10.0 ;
N019 W20.0 ;
N020 X36.0 W22.0 ;
N021 G40 ;
N022 G70 P014 Q021 ;
N023 G00 X220.0 Z60.0 ;
N024 M30 ;


Fanuc 10/11 One Line Format

N011 G50 X220.0 Z190.0 ;
N012 G00 X176.0 Z132.0 ;
N013 G72 P014 Q019 U4.0 W2.0 D7000 F0.3 S550 ;
N014 G00 Z56.0 S700 ;
N015 G01 X120.0 W14.0 F0.15 ;
N016 W10.0 ;
N017 X80.0 W10.0 ;
N018 W20.0 ;
N019 X36.0 W22.0 ;
N020 G70 P014 Q019 ;

Example – 6

In this example, we used G72 CNC code for facing in CNC Lathe. We used G70 Finishing Cycle also for final cutting and it was different tool.

G72 cnc code example for facing in CNC Lathe - 6
G72 cnc code example for facing in CNC Lathe – 6
O0007;
N10 G54;
N15 G50 S2000;
N20 G96 S100;
N25 T0101 M08;
N30 G99 F0.25;
N35 G00 X72 Z0;
N40 G01 X–1.6;
N45 G00 X72 Z3;
N50 G72 W3. R1.;
N55 G72 P60 Q90 U0.5 W0.3 F0.25;
N60 G41 G01 71 Z-44;
N63 G01 X50;
N65 G01 Z–26;
N70 G02 X38 Z-20 R6;
N75 G01 X30;
N80 G01 Z0;
N90 G40;
N95 G28 U0 W0;
N100 T0202 F0.2;
N105 G00 X72 Z3;
N110 G70 P60 Q90 F0.2;
N115 G28 U0 W0;
N120 M05 M09;
N125 M30;

Example – 7

In this example, we used G72 code for facing in CNC Lathe. We used G70 Finishing Cycle also for final cutting and it was different tool.

G72 code example for facing in CNC Lathe - 7
G72 code example for facing in CNC Lathe – 7
O0014;
N10 G54;
N15 T0101 M04;
N20 G50 S1500;
N25 G96 S80;
N28 G99 F0.3;
N35 G00 X82 Z0;
N40 G01 X–1.6;
N45 G00 X82 Z5;
N48 G41;
N50 G72 W3. R1.;
N55 G72 P60 Q90 U0.5 W0.3 F0.2;
N60 G01 X81 Z-51;
N65 G01 X60;
N70 G01 Z–45;
N75 X45;
N80 X40 Z–15;
N85 X24;
N90 Z0;
N100 G40;
N105 G00 X200 Z200;
N110 T0202;
N115 G50 S2000;
N120 G96 S120 F0.2;
N125 G00 X82 Z2;
N128 G42;
N130 G70 P65 Q90;
N135 G28 U0 W0;
N140 M05 M09;
N145 M30;

Example – 8

In this example, we used G72 Facing Cycle for face cutting in CNC Lathe. We didn’t use G70 Finishing Cycle.

G72 Facing Cycle example for face cutting without finishing - 8
G72 Facing Cycle example for face cutting without finishing – 8
O0072 ;
T0000 ;
G0 X0. Z-100. M07 ;
T0101
G92 S2500 ;
G96 S180 M03 X105. Z0. ;
G01 X-1. F0.25 ;
G00 X105. Z2. ;
G72 W1.5 R1. ;
G72 P10 Q20 U0.5 W0.25 F0.3 ;
N10 G0 Z-15. ;
G01 X60. Z-10. ;
X30. ;
X25. Z0. ;
N20 X0. ;
G97 S0 T0000 M09 G0 X0. Z-100. ;
M30 ;

 


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