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In this article, we describe how to use G71 cycle for stock removal in turning for CNC lathe machines with all details and examples.

G71 Cycle Format

G71 UΔd Re;
G71 Pns Qnf UΔu WΔw Ff;

Parameters

Δd = Depth of cut in radius
e = Tool escape / tool retraction distance
ns = Sequence number of the first block of the program which specifies the finish figure.
nf = Sequence number of the last block of the program which specifies the finish figure.
Δu = Finish allowance on “X” axis / diameter.
Δw = Finish allowance on “Z” axis / face.
f = Feed

G71 Cycle Examples

G71 CNC Program Example – 1

O00 71 ;
N1 T00 00 ;
G00 X0. Z-100.;
T0606 M07 ;
G92 S2500 ;
G96 S180 M03 X75.Z0. ;
G01 X-1 F0.25 ;
G00 X75.Z2. ;
G71 U2.5 R1. ;
G71 P10 Q20 U1. W0.5 F0.3 ;
N10 G0 X21. ;
G01 G42 X23. Z0. F0.2 ;
A135. X25. ;
Z-25. ;
X40. R3. ;
A180. R2. ;
X60. Z-60. A135. R2. ;
Z-75. R3. ;
X72.
N20 G00 GG40 X75. ;
G70 P10 Q20 ; FINISHING CYCLE
N2 S0 T00 00 ;
G00 X0.Z-100. ;
T0808 M07 ;
G92 S2500 ;
G96 S200 M03 X75. Z2. ;
G70 P10 Q20 ;
S0 T00 00 M09 ;
G0 X0.Z-100. ;
M05 ;
M30 ;


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In this article, we described How to use G71 cycle for stock removal in turning for CNC lathe machines with all details and examples. For more details;

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