G70 Finish Turning Cycle

G70 P(ns) Q(nf) F(f) S(s)

P(ns) = serial number (_ _ _) of the first line of the NC, which determines the removal of the finishing allowance.

Q(nf) = serial number (_ _ _) of the last line of the UE, which determines the removal of the finishing allowance.

F(f) = Feedrate for finishing.
S(s) = spindle speed / cutting speed in fine turning.

Cycle of rough external turning by code G71. Example #1.

UE processing of parts, the border of the removal of the allowance with the leaving of the finishing allowance.

O1003 (G71 EXAMPLES 1);

G50 32000;

G54 G21 G99 G40;

G0 G28 U0 W0;

T0101;

G96 S200 M4;

X102Z2;

G71 U3 R1;

G71 P100 Q200 U0.6 W0.l F0.5 M8;

N100 G0 X40;

G1 Z-30;

X50;

X90 W-20;

Z-70;

N200X101;

GO XI50 Z50 M9;

G28 U0 W0;

M30;

Cycle of rough external turning by code G71. Example #2.

O1004 (G71 EXAMPLES 2);

G50 S2000;

G54 G21 G99 G40;

G0 G28 U0 W0;

T0101;

G96 S200 M4;

X102Z2;

G71 U5 R1;

G71 P100 Q200 U0.6 W0.l F0.5 M8;

N100 G0 X34;

G1Z-15;

X48;

X70 W-25;

W-15;

X80;

Z-65;

N200X101;

G0 XI50 Z150 M9;

G28 U0 W0;

M30;

Cycle of rough external turning by code G71. G70 Finish Turning Cycle with Cutter Radius Compensation.

Example #3

T02 cutting edge radius = 0.8 T02 cutting edge vector = 3

O1005 (G7I EXERCISE 3);

G50 S2000;

G54 G21 G99 G40;

G0 G28 U0 W0;

T0101;

G96 S200 M4;

X102Z2;

G71 U5 R1;

G71 P100 Q200 U0.6 W0.l F0.5 M8;

N100 G0 X40;

G1 G42 Z0;

Z-20;

X60 K-2;

Z-50;

G2 X80 Z-60 R10;

G1 X100;

N200 G40 X101;

G0 G28 U0 W0 M9;

M1;

G21 G99 G40;

T0202;

G96 S300 M4;

X102Z2;

G70 P100 Q200 F0.15 M8;

G0 G28 U0 W0 M9;

M30;

Cycle of rough external turning by code G71. G70 Finish Turning Cycle with Cutter Radius Compensation.

Example #4

T02 cutting edge radius = 0.8 T02 cutting edge vector = 2

O1006 (G7I EXERCISE 4);

G50 S3000;

G54 G21 G99 G40;

G0 G28 U0 W0;

T0101;

G96 S220 M4;

X38Z2;

G71 U2.5 R0.5;

G71 P100 Q200 U-0.6 W0.l F0.3 M8;

N100 G0 X83;

G1 G41 X83 Z0;

X80 Z-1.5;

Z-20;

X70 W-15;

x60;

W-20;

X50 W-15;

X43;

X40 Z-71.5;

N200 G40 X39 Z-72.5;

G0 G28 U0 W0 M9;

M1;

G21 G99 G40;

T0202;

G96 S300 M4;

X38Z2;

G70 P100 Q200 F0.15 M8;

G0 G28 U0 W0 M9;

M30;

G71 external rough turning cycle, G70 finishing turning cycle with cutting edge radius compensation.

Example #5

T02 cutting edge vector = 3 T02 cutting edge radius = 0.8

O1007 (G71 EXERCISE 5);

G50 S2000;

G54 G21 G99 G40;

G0 G28 U0 W0;

T0101;

G96 S200 M4;

X102Z2;

G71 U3 R0.5;

G71 P100 Q200 U0.6 W0.l F0.3 M8;

N100 G0 X27.5;

G1 G42 X28 Z0;

X30Z-1;

Z-15;

X48 W-20;

x60;

G3 X80 W-10 I0 K-10;

G1 Z-60;

x96;

X100Z-62;

N200 G40 X101.75 Z-63.5;

G0 G28 U0 W0 M9;

M1;

G21 G99 G40;

T0202;

G96 S300 M4;

X102Z2;

G70 P100 Q200 F0.15 M8;

G0 G28 U0 W0 M9;

M30;

G71 external rough turning cycle, G70 finishing turning cycle with cutting edge radius compensation.

Example #6.

Machining depth 3 mm, finishing allowance X = 0.6, Z = 0.1

T02 cutting edge vector = 3 T02 cutting edge radius = 0.8

G71 external rough turning cycle, G70 finishing turning cycle with cutting edge radius compensation.

Answer to problem number 6.

T02 cutting edge vector = 3 T02 cutting edge radius = 0.8

O1008 (G71 EXERCISE 6);

G50 S3000;

G54 G21 G99 G40;

G0 G28 U0 W0;

T0101;

G96 S200 M4;

X102Z2;

G71 U3 R0.5;

G71 P100 Q200 U0.6 W0.l F0.3 M8;

N100 G0 X40;

G1 G42 Z0;

Z-30;

x46;

X50 W-2;

Z-40;

G2 X70 Z-50 R10;

G1X90;

Z-70;

x100;

N200 G40 X101.75;

G0 G28 U0 W0 M9;

M1;

G21 G99 G40;

T0202;

G96 S300 M4;

X102Z2;

G70 P100 Q200 F0.15 M8;

G0 G28 U0 W0 M9;

M30;

G71 external rough turning cycle, finishing program with cutting edge radius compensation. Example #7.

If the machining profile is non-monotonic or varies in shape (includes notches), the G71, G72, and G73 cycles cannot complete the profile. The NC coordinates that define the rough turning profile must be changed to prevent the rough cutter from sinking into the recess during the pre-finishing pass. For
in order for the finishing cutter to process the profile taking into account the recesses, programming of individual NC lines is required. In this case, the G70 cycle is not used.

T02 cutting edge vector = 3 T02 cutting edge radius = 0.8

O1009 (G71 EXERCISE 7);

G50 S3000;

G54 G21 G99 G40;

G0 G28 U0 W0;

T0101;

G96 S220 M4;

X102Z2;

G71 U3 R0.5;

G71 P100 Q200 U0.6 W0.l F0.3 M8;

N100 G0 X47.5;

G1 Z0 X48.08;

Z-5 X58.08;

Z-50;

x86;

X90 W-2;

Z-70;

N200X101;

G0 G28 U0 W0 M9;

M1;

N200 G21 G99 G40;

G0 G28 U0 W0;

T0202;

G96 S300 M4;

X102Z2;

X47.5 M8;

G1 G42 X48.08 Z0 F0.15;

X58.08Z-5;

Z-25;

X52Z-30.27;

Z-50;

x86;

X90 W-2;

Z-70;

x100;

G40X101;

G0 X150 Z50 M9;

G28 U0 W0;

M30;

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