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FANUC Series 0i-MODEL D, Series 0i Mate-MODEL D. For Lathe System USER’S MANUAL - page 11

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

Escaping operation after rough cutting

Escaping operation after

as finishing

rough cutting

Start point

{

{

Depth of cut ∆d

Fig. 6.4.1 (l) Escaping operation when the tool returns to the start point

(type II)

(6) Order and path for rough cutting of pockets

Rough cutting is performed in the following order.

(a) When the figure shows monotone decrease along the first

axis on the plane (Z-axis for the ZX plane)

Rough cutting is performed in the order <1>, <2>, and <3>

from the rightmost pocket.

<3>

<2>

<1>

+X

+Z

Fig. 6.4.1 (m) Rough cutting order in the case of monotone decrease

(type II)

(b) When the figure shows monotone increase along the first

axis on the plane (Z-axis for the ZX plane)

Rough cutting is performed in the order <1>, <2>, and <3> from

the leftmost pocket.

<1>

<2>

<3>

+X

+Z

Fig. 6.4.1 (n) Rough cutting order in the case of monotone increase

(type II)

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6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

The path in rough cutting is as shown below.

35

4

3

1

34

5

24

9

10

25

2

23

29

22

21

28

11

6

30

8

26

15

27

7

33

31

12

14

20

16

32

13

19

18

17

Fig. 6.4.1 (o) Cutting path for multiple pockets (type II)

The following figure shows how the tool moves after rough cutting for

a pocket in detail.

g

Rapid traverse

21

22

•

D

20

Escaping from

the bottom

19

Cutting feed

Fig. 6.4.1 (p) Details of motion after cutting for a pocket (type II)

Cuts the workpiece at the cutting feedrate and escapes to the direction

of 45 degrees.

(Operation 19)

Then, moves to the height of point D in rapid traverse.

(Operation

20)

Then, moves to the position the amount of g before point D.

(Operation 21)

Finally, moves to point D in cutting feed.

The clearance g to the cutting feed start position is set in parameter No.

5134.

For the last pocket, after cutting the bottom, the tool escapes to the

direction of 45 degrees and returns to the start point in rapid traverse.

(Operations 34 and 35)

- 285 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

CAUTION

1 This CNC differs from the Series 0i-C in cutting of a

pocket.

The tool first cuts the nearest pocket to the start

point. After cutting of the pocket terminates, the

tool moves to the nearest but one pocket and starts

cutting.

2 When the figure has a pocket, generally specify a

value of 0 for ∆w (finishing allowance). Otherwise,

the tool may dig into the wall on one side.

- Tool nose radius compensation

When using tool nose radius compensation, specify a tool nose radius

compensation command

(G41, G42) before a multiple repetitive

canned cycle command (G70, G71, G72, G73) and specify the cancel

command (G40) outside the blocks (from the block specified with P to

the block specified with Q) specifying a target finishing figure. If a

tool nose radius compensation command

(G40, G41, or G42) is

specified in the G70, G71, G72, or G73 command, alarm PS0325 is

issued.

When this cycle is specified in the tool nose radius compensation

mode, offset is temporarily canceled during movement to the start

point. Start-up is performed in the first block. Offset is temporarily

canceled again at the return to the cycle start point after termination of

cycle operation. Start-up is performed again according to the next

move command. This operation is shown in the figure below.

Start-up

Offset cancel

Cycle start point

z

Offset cancel

Start-up

This cycle operation is performed according to the figure determined

by the tool nose radius compensation path when the offset vector is 0

at start point A and start-up is performed in a block between path

A-A'.

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6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

B

A

Position between

A-A' in which start-up

Target figure program for

is performed

which tool nose radius

compensation is not applied

+X

A’

Tool nose center path when tool nose radius

+Z

compensation is applied with G42

Fig. 6.4.1 (q) Path when tool nose radius compensation is applied

A

B

A’

Position between

+X

A-A' in

which

start-up

is

Target figure program for

f

d

Tool nose center path when tool

which tool nose radius

+Z

nose radius compensation is

compensation is not applied

applied with G42

NOTE

To perform pocketing in the tool nose radius

compensation mode, specify the linear block A-A'

outside the workpiece and specify the figure of an

actual pocket. This prevents a pocket from being

dug.

- Movement to the previous turning start point

Movement to the turning start point is performed with two operations.

(Operations

1 and 2 in the figure below.) As movement to the

present turning start point, operation 1 temporarily moves the tool to

the previous turning start point, then operation 2 moves the tool to the

present turning start point.

Operation 1 moves the tool in cutting feed. Operation 2 moves the

tool according to the mode (G00 or G01) specified in the start block in

the geometry program.

Bit 0 (ASU) of parameter No. 5107 can be set to 1 so that operation 1

moves the tool in rapid traverse.

- 287 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

For a type I command

Operation 1

Previous turning

start point

Operation 2

Present turning

start point

+X

:

Rapid traverse can be selected.

+Z

:

According to the mode in the start block.

- 288 -

6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

6.4.2

Stock Removal in Facing (G72)

This cycle is the same as G71 except that cutting is performed by an

operation parallel to the second axis on the plane (X-axis for the ZX

plane).

Format

ZpXp plane

G72 P(ns) Q(nf) U(∆u) W(∆w) I(∆i) K(∆k) D(∆d) F(f ) S(s ) T(t );

N (ns) ;

The move command between A and B is specified in the

blocks from sequence number ns to nf.

N (nf) ;

YpZp plane

G72 P(ns) Q(nf) V(∆w) W(∆u) J(∆k) K(∆i) D(∆d) F(f ) S(s ) T(t );

N (ns) ;

N (nf) ;

XpYp plane

G72 P(ns) Q(nf) U(∆w) V(∆u) I(∆k) J(∆i) D(∆d) F(f ) S(s ) T(t );

N (ns) ;

N (nf) ;

∆d

: Depth of cut

The cutting direction depends on the direction AA'.

ns

: Sequence number of the first block for the program of finishing

shape.

nf

: Sequence number of the last block for the program of finishing

shape.

∆u

: Distance of the finishing allowance in the direction of the second

axis on the plane (X-axis for the ZX plane)

∆w : Distance of the finishing allowance in the direction of the first axis

on the plane (Z-axis for the ZX plane)

∆i

: Distance of the finishing allowance of the roughing in the direction

of the second axis on the plane (X-axis for the ZX plane)

∆k

: Distance of the finishing allowance of the roughing in the direction

of the first axis on the plane (Z-axis for the ZX plane)

f,s,t

: Any F , S, or T function contained in blocks ns to nf in the cycle is

ignored, and the F, S, or T function in this G72 block is effective.

NOTE

Even if pocket calculator type decimal point

programming is specified (DPI (bit 0 of parameter

No. 3401) = 1), the unit of address D is least input

increment. In addition, when a decimal point is

input in address D, the alarm (PS0007) is issued.

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6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

Diameter/radius

Decimal

Unit

Sign

programming

point input

Depends on the

Not allowed

∆d

increment system for

Radius programming

Not required

the reference axis.

Depends on

Depends on the

diameter/radius

∆u

increment system for

Required

Allowed

programming for the

the reference axis.

second axis on the plane.

Depends on

Depends on the

diameter/radius

∆w

increment system for

Required

Allowed

programming for the first

the reference axis.

axis on the plane.

Depends on the

∆i

increment system for

Radius programming

Not required

Allowed

the reference axis.

Depends on the

∆k

increment system for

Radius programming

Not required

Allowed

the reference axis.

∆d

(F): Cutting feed

(R): Rapid traverse

C

A'

A

Tool path

(F)

e

(R)

(R)

45°

Target figure

(F)

+X

∆u/2

B

+Z

∆w

e: Escaping amount (parameter No.5133)

Fig. 6.4.2 (r) Cutting path in stock removal in facing (type I)

- 290 -

6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

Explanation

- Operations

When a target figure passing through A, A', and B in this order is

given by a program, the specified area is removed by ∆d (depth of cut),

with the finishing allowance specified by ∆u/2 and ∆w left.

NOTE

1 F, S, and T functions which are specified in the

move command between points A and B are

ineffective and those specified in G72 block or the

previous block are effective. M and second

auxiliary functions are treated in the same way as

F, S, and T functions.

2 When the constant surface speed control function

is enabled (bit 0 (SSC) of parameter No. 8133 is

set to 1), the G96 or G97 command specified in the

move command between points A and B is

ignored. If you want to enable the G96 or G97

command, specify the command in the G71 or

previous block.

- Escaping amount (e)

The escaping amount (e) is set in parameter No. 5133.

Diameter/radius

No.

Unit

Sign

programming

Depends on the increment

Radius

Not

5133

system for the reference axis.

programming

required

- Target figure

Patterns

The following four cutting patterns are considered. All of these

cutting cycles cut the workpiece with moving the tool in parallel to the

second axis on the plane (X-axis for the ZX plane). At this time, the

signs of the finishing allowances of ∆u and ∆w are as follows:

+X

B

B

U(-)...W(+)...

U(-)...W(-)...

+Z

A

A

A'

A'

Both linear and circular

interpolation are possible

A'

A'

A

A

U(+)...W(+)...

U(+)...W(-)...

B B

Fig. 6.4.2 (s) Signs of the values specified at U and W in stock removal

in facing

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6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

Limitation

(1) For W(+), a figure for which a position higher than the cycle start

point is specified cannot be machined.

For W(-), a figure for which a position lower than the cycle start

point is specified cannot be machined.

(2) For type I, the figure must show monotone increase or decrease

along the first and second axes on the plane.

(3) For type II, the figure must show monotone increase or decrease

along the second axis on the plane.

Start block

In the start block in the program for a target figure

(block with

sequence number ns in which the path between A and A' is specified),

G00 or G01 must be specified. If it is not specified, alarm PS0065 is

issued.

When G00 is specified, positioning is performed along A-A’. When

G01 is specified, linear interpolation is performed with cutting feed

along A-A’.

In this start block, also select type I or II.

Check functions

During cycle operation, whether the target figure shows monotone

increase or decrease is always checked.

NOTE

When tool nose radius compensation is applied,

the target figure to which compensation is applied

is checked.

The following checks can also be made.

Check

Related parameter

Checks that a block with the sequence number

Enabled when bit 2

specified at address Q is contained in the

(QSR) of parameter No.

program before cycle operation.

5102 is set to 1.

Checks the target figure before cycle operation.

Enabled when bit 2

(Also checks that a block with the sequence

(FCK) of parameter No.

number specified at address Q is contained.)

5104 is set to 1.

- Types I and II

Selection of type I or II

For G72, there are types I and II.

When the target figure has pockets, be sure to use type II.

Escaping operation after rough cutting in the direction of the second

axis on the plane (X-axis for the ZX plane) differs between types I and

II. With type I, the tool escapes to the direction of

45 degrees.

With type II, the tool cuts the workpiece along the target figure.

When the target figure has no pockets, determine the desired escaping

operation and select type I or II.

- 292 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

6.4.3

Pattern Repeating (G73)

This function permits cutting a fixed pattern repeatedly, with a pattern

being displaced bit by bit. By this cutting cycle, it is possible to

efficiently cut workpiece whose rough shape has already been made

by a rough machining, forging or casting method, etc.

Format

ZpXp plane

G73 P(ns) Q(nf) U(∆u) W(∆w) I(∆i) K(∆k) D(d) F(f ) S(s ) T(t ) ;

N (ns) ;

The move command between A and B is specified in the blocks from

sequence number ns to nf.

N (nf) ;

YpZp plane

G73 P(ns) Q(nf) V(∆w) W(∆u) J(∆k) K(∆i) D(d) F(f ) S(s ) T(t ) ;

N (ns) ;

N (nf) ;

XpYp plane

G73 P(ns) Q(nf) U(∆w) V(∆u) I(∆k) J(∆i) D(d) F(f ) S(s ) T(t ) ;

N (ns) ;

N (nf) ;

∆i

: Distance of escape in the direction of the second axis on the

plane (X-axis for the ZX plane)

∆k

: Distance of escape in the direction of the first axis on the plane

(Z-axis for the ZX plane)

d

: The number of division

This value is the same as the repetitive count for rough cutting.

ns

: Sequence number of the first block for the program of finishing

shape.

nf

: Sequence number of the last block for the program of finishing

shape.

∆u

: Distance of the finishing allowance in the direction of the second

axis on the plane (X-axis for the ZX plane)

∆w

: Distance of the finishing allowance in the direction of the first

axis on the plane (Z-axis for the ZX plane)

f, s, t

: Any F, S, and T function contained in the blocks between

sequence number "ns" and "nf" are ignored, and the F, S, and T

functions in this G73 block are effective.

NOTE

Even if pocket calculator type decimal point

programming is specified (bit 0 (DPI) of parameter

No. 3401 = 1), the unit of address D is the least

input increment. In addition, when a decimal point

is input in address D, alarm PS0007 is issued.

- 294 -

6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

Diameter/radius

Decimal

Unit

Sign

programming

point input

Depends on the increment

∆i

system for the reference

Radius programming

Required

Allowed

axis.

Depends on the increment

∆k

system for the reference

Radius programming

Required

Allowed

axis.

Depends on

Depends on the increment

diameter/radius

∆u

system for the reference

Required

Allowed

programming for the

axis.

second axis on the plane.

Depends on

Depends on the increment

diameter/radius

∆w

system for the reference

Required

Allowed

programming for the first

axis.

axis on the plane.

∆k+∆w

D

∆w

∆i+∆u/2

∆u/2

C

A

(R)

(R)

B

(F)

∆u/2

A'

∆w

+X

(F): Cutting feed

Target figure

(R): Rapid traverse

+Z

Fig. 6.4.3 (t) Cutting path in pattern repeating

Explanation

- Operations

When a target figure passing through A, A', and B in this order is

given by a program, rough cutting is performed the specified number

of times, with the finishing allowance specified by ∆u/2 and ∆w left.

NOTE

1 After cycle operation terminates, the tool returns to

point A.

2 F, S, and T functions which are specified in the

move command between points A and B are

ineffective and those specified in G73 block or the

previous block are effective. M and second

auxiliary functions are treated in the same way as

F, S, and T functions.

- 295 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

- Target figure patterns

As in the case of G71, there are four target figure patterns. Be

careful about signs of ∆u, ∆w, ∆i, and ∆k when programming this

cycle.

- Start block

In the start block in the program for the target figure (block with

sequence number ns in which the path between A and A' is specified),

G00 or G01 must be specified. If it is not specified, alarm PS0065 is

issued.

When G00 is specified, positioning is performed along A-A’. When

G01 is specified, linear interpolation is performed with cutting feed

along A-A’.

- Check function

The following check can be made.

Check

Related parameter

Checks that a block with the sequence

Enabled when bit 2 (QSR)

number specified at address Q is contained

of parameter No. 5102 is

in the program before cycle operation.

set to 1.

- Tool nose radius compensation

Like G71, this cycle operation is performed according to the figure

determined by the tool nose radius compensation path when the offset

vector is

0 at start point A and start-up is performed in a block

between path A-A'.

- 296 -

6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

6.4.4

Finishing Cycle (G70)

After rough cutting by G71, G72 or G73, the following command

permits finishing.

Format

G70 P(ns) Q(nf) ;

ns : Sequence number of the first block for the program of

finishing shape.

nf : Sequence number of the last block for the program of

finishing shape.

Explanation

- Operations

The blocks with sequence numbers ns to nf in the program for a target

figure are executed for finishing. The F, S, T, M, and second

auxiliary functions specified in the G71, G72, or G73 block are

ignored and the F, S, T, M, and second auxiliary functions specified in

the blocks with sequence numbers ns to nf are effective.

When cycle operation terminates, the tool is returned to the start point

in rapid traverse and the next G70 cycle block is read.

- Target figure check function

The following check can be made.

Check

Related parameter

Checks that a block with the sequence

Enabled when bit 2 (QSR)

number specified at address Q is contained

of parameter No. 5102 is

in the program before cycle operation.

set to 1.

- Storing P and Q blocks

When rough cutting is executed by G71, G72, or G73, up to three

memory addresses of P and Q blocks are stored. By this, the blocks

indicated by P and Q are immediately found at execution of G70

without searching memory from the beginning for them. After some

G71, G72, and G73 rough cutting cycles are executed, finishing cycles

can be performed by G70 at a time. At this time, for the fourth and

subsequent rough cutting cycles, the cycle time is longer because

memory is searched for P and Q blocks.

- 297 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

Example

G71 P100 Q200 ...;

N100 ...;

...;

...;

N200 ...;

G71 P300 Q400 ...;

N300 ...;

...;

...;

N400 ...;

...;

...;

G70 P100 Q200 ; (Executed without a search for

the first to third cycles)

G70 P300 Q400 ; (Executed after a search for the

fourth and subsequent cycles)

NOTE

The memory addresses of P and Q blocks stored

during rough cutting cycles by G71, G72, and G73

are erased after execution of G70.

All stored memory addresses of P and Q blocks

are also erased by a reset.

- Return to the cycle start point

In a finishing cycle, after the tool cuts the workpiece to the end point

of the target figure, it returns to the cycle start point in rapid traverse.

NOTE

The tool returns to the cycle start point always in

the nonlinear positioning mode regardless of the

setting of bit 1 (LRP) of parameter No. 1401.

Before executing a finishing cycle for a target figure

with a pocket cut by G71 or G72, check that the

tool does not interfere with the workpiece when

returning from the end point of the target figure to

the cycle start point.

- Tool nose radius compensation

Like G71, this cycle operation is performed according to the figure

determined by the tool nose radius compensation path when the offset

vector is

0 at start point A and start-up is performed in a block

between path A-A'.

- 298 -

6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

Example

Stock removal in facing (G72)

X axis

2

Start point

7

Z axis

60

10

10

10

20

20

2

190

(Diameter designation for X axis, metric input)

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 ;

Parameter No. 5133 = 1.0 (escaping amount)

Finishing allowance (4.0 in diameter in the X direction, 2.0 in the Z direction)

- 299 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

Pattern repeating (G73)

16

B

X axis

Z axis

0

2

14

20

40

10

40

10

20

40

220

(Diameter designation, metric input)

N011

G50 X260.0 Z220.0 ;

N012

G00 X220.0 Z160.0 ;

N013

G73 P014 Q019 U4.0 W2.0 I14.0 K14.0 D3 F0.3 S0180

N014

G00 X80.0 W-40.0 ;

N015

G01 W-20.0 F0.15 S0600 ;

N016

X120.0 W-10.0;

N017

W-20.0 S0400 ;

N018

G02 X160.0 W-20.0 R20.0 ;

N019

G01 X180.0 W-10.0 S0280 ;

N020

G70 P014 Q019 ;

- 300 -

6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

6.4.5

End Face Peck Drilling Cycle (G74)

This cycle enables chip breaking in outer diameter cutting. If the

second axis on the plane (X-axis (U-axis) for the ZX plane) and

address P are omitted, operation is performed only along the first axis

on the plane (Z-axis for the ZX plane), that is, a peck drilling cycle is

performed.

Format

ZpXp-plane

G74X(U)_ Z(W)_ I(∆i) K(∆k) D(∆d) F(f ) ;

YpZp-plane

G74Y(V)_ Z(W)_ J(∆k) K(∆i) D(∆d) F(f ) ;

XpYp-plane

G74X(U)_ Y(V)_ I(∆k) J(∆i) D(∆d) F(f ) ;

X_,Z_ : Coordinate of the second axis on the plane (X-axis

for the ZX plane) at point B and

Coordinate of the first axis on the plane (Z-axis for

the ZX plane) at point C

U_,W_ : Travel distance along the second axis on the plane

(U for the ZX plane) from point A to B

Travel distance along the first axis on the plane (W

for the ZX plane) from point A to C

(When G code system A is used. In other cases,

X_,Z_ is used for specification.)

∆i

: Travel distance in the direction of the second axis on

the plane (X-axis for the ZX plane)

∆k

: Depth of cut in the direction of the first axis on the

plane (Z-axis for the ZX plane)

∆d

: Relief amount of the tool at the cutting bottom

f

: Feedrate

Diameter/radius

Decimal

Unit

Sign

programming

point input

Depends on the increment

∆i

Radius programming

Not required

Allowed

system for the reference axis.

Depends on the increment

∆k

Radius programming

Not required

Allowed

system for the reference axis.

Depends on the increment

∆d

Radius programming

NOTE 1

Not allowed

system for the reference axis.

NOTE

1 Normally, specify a positive value for ∆d. When X (U) and

∆i are omitted, specify a value with the sign indicating the

direction in which the tool is to escape.

2 Even if pocket calculator type decimal point programming is

specified (DPI (bit 0 of parameter No. 3401) = 1), the unit of

address D is least input increment. In addition, when a

decimal point is input in address D, the alarm (PS0007) is

issued.

- 301 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

∆k'

∆k

∆k

∆k

∆k

[0 < ∆k’ ≤ ∆k]

∆d

A

∆i

C

(R)

(R)

(F)

(F)

(F)

(F)

(F)

U/2

(R)

(R)

(R)

(R)

∆i

[0 < ∆i’ ≤ ∆i]

∆i’

X

Z

W

B

+X

e

(R) ... Rapid traverse

(F) ... Cutting feed

+Ze : Return amount (parameter No.5139)

Fig. 6.4.5 (a) Cutting path in end face peek drilling cycle

Explanation

- Operations

A cycle operation of cutting by ∆k and return by e is repeated.

When cutting reaches point C, the tool escapes by ∆d. Then, the tool

returns in rapid traverse, moves to the direction of point B by ∆i, and

performs cutting again.

- Return amount (e)

The escaping amount (e) is set in parameter No. 5139.

Diameter/radius

No.

Unit

Sign

programming

Depends on the increment

Radius

Not

5139

system for the reference axis.

programming

required

- Tool nose radius compensation

Tool nose radius compensation cannot be applied.

- 302 -

6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

6.4.6

Outer Diameter / Internal Diameter Drilling Cycle (G75)

This cycle is equivalent to G74 except that the second axis on the

plane (X-axis for the ZX plane) changes places with the first axis on

the plane (Z-axis for the ZX plane). This cycle enables chip breaking

in end facing. It also enables grooving during outer diameter cutting

and cutting off (when the Z-axis (W-axis) and Q are omitted for the

first axis on the plane).

Format

ZpXp-plane

G75 X(U)_ Z(W)_ I(∆i) K(∆k) D(∆d) F (f ) ;

YpZp-plane

G75 Y(V)_ Z(W)_ J(∆k) K(∆i) D(∆d) F(f ) ;

XpYp-plane

G75 X(U)_ Y(V)_ I(∆k) J(∆i) D(∆d) F(f ) ;

X_, Z_

: Coordinate of the second axis on the plane (X-axis

for the ZX plane) at point B and

Coordinate of the first axis on the plane (Z-axis for

the ZX plane) at point C

U_, W_ : Travel distance along the second axis on the plane

(U for the ZX plane) from point A to B

Travel distance along the first axis on the plane (W

for the ZX plane) from point A to C

∆i

: Depth of cut in the direction of the second axis on

the plane (X-axis for the ZX plane)

∆k

: Travel distance in the direction of the first axis on

the plane (Z-axis for the ZX plane)

∆d

: Relief amount of the tool at the cutting bottom

f

: Feedrate

Diameter/radius

Decimal

Unit

Sign

programming

point input

Depends on the increment

Not

∆i

Radius programming

Allowed

system for the reference axis.

required

Depends on the increment

Not

∆k

Radius programming

Allowed

system for the reference axis.

required

Depends on the increment

∆d

Radius programming

NOTE 1

Not allowed

system for the reference axis.

NOTE

1 Normally, specify a positive value for ∆d. When Z

(W) and ∆k are omitted, specify a value with the sign

indicating the direction in which the tool is to escape.

2 Even if pocket calculator type decimal point

programming is specified (DPI (bit 0 of parameter

No. 3401) = 1), the unit of address D is least input

increment. In addition, when a decimal point is input

in address D, the alarm (PS0007) is issued.

- 303 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

C

(R)

A

(R)

(F)

∆i

(R)

e

(F)

∆i

(R)

U/2

(F)

∆i

(R)

(F)

∆i

(R)

(F)

∆i’

B

∆d

∆k

X

Z

W

+X

(R) ... Rapid traverse

(F) ... Cutting feed

e : Return amount (parameter No.5139)

+Z

Fig. 6.4.6 (a) Outer diameter/internal diameter drilling cycle

Explanation

- Operations

A cycle operation of cutting by ∆i and return by e is repeated.

When cutting reaches point B, the tool escapes by ∆d. Then, the tool

returns in rapid traverse, moves to the direction of point C by ∆k, and

performs cutting again.

Both G74 and G75 are used for grooving and drilling, and permit the

tool to relief automatically.

Four symmetrical patterns are

considered, respectively.

- Return amount (e)

The escaping amount (e) is set in parameter No. 5133.

Diameter/radius

No.

Unit

Sign

programming

Depends on the increment

Radius

Not

5139

system for the reference axis.

programming

required

- Tool nose radius compensation

Tool nose radius compensation cannot be applied.

- 304 -

6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

6.4.7

Multiple Threading Cycle (G76)

The multiple threading cycle can select four cutting methods.

Format

ZpXp-plane

G76 X(U)_ Z(W)_ I(i) K(k) D(∆d) A(a) F(L) P(p) Q(q) ;

YpZp-plane

G76 Y(V)_ Z(W)_ J(k) K(i) D(∆d) A(a) F(L) P(p) Q(q) ;

XpYp-plane

G76 X(U)_ Y(V)_ I(k) J(i) D(∆d) A(a) F(L) P(p) Q(q) ;

X_, Z_

: Coordinates of the cutting end point (point D in the

figure) in the direction of the length

U_, W_ : Travel distance to the cutting end point (point D in

the figure) in the direction of the length

a

: Angle of tool nose

From 0 to 120 in steps of 1 degree

(The default is 0.)

i

: Taper amount

If i = 0, ordinary straight threading can be made.

k

: Height of thread

∆d

: Depth of cut in 1st cut

L

: Lead of thread

p

: Cutting method (one-edge threading with constant

cutting amount by default or for P0)

P1 : One-edge threading with constant cutting

amount

P2 : Both-edge zigzag threading with constant

cutting amount

P3 : One-edge threading with constant depth of cut

P4 : Both-edge zigzag threading with constant

depth of cut

q

: Threading start angle shift

(From 0 to 360 degrees in steps of 0.001 degrees)

NOTE

1 Even if pocket calculator type decimal point

programming is specified (DPI (bit 0 of parameter

No. 3401) = 1), the unit of address D is least input

increment. In addition, when a decimal point is

input in address D, the alarm (PS0007) is issued.

2 A decimal point included in address A has no

meaning. That is, A120. is equivalent to A120 in

specifying 120 degrees.

3 To use P2, P3, or P4 as a cutting method, the

option for multiple repetitive canned cycle II is

required.

4 Address Q does not allow decimal point input.

- 305 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

Diameter/radius

Decimal

Unit

Sign

programming

point input

Depends on the increment

i

Radius programming

Required

Allowed

system for the reference axis.

Depends on the increment

k

Radius programming

Not required

Allowed

system for the reference axis.

Depends on the increment

∆d

Radius programming

Not required

Not allowed

system for the reference axis.

E

(R)

A

(R)

(R)

U/2

B

(F)

Δd

D

i

k

X

r

C

Z

W

+X

r: Amount of thread chamfering (parameter No.5130)

+Z

Fig. 6.4.7 (a) Cutting path in multiple threading cycle

- 306 -

6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

Explanation

- Operations

This cycle performs threading so that the length of the lead only

between C and D is made as specified in the F code. In other

sections, the tool moves in rapid traverse.

The time constant for acceleration/deceleration after interpolation and

FL feedrate for thread chamfering and the feedrate for retraction after

chamfering are the same as for thread chamfering with canned cycle.

CAUTION

Notes on threading are the same as those on G32

threading. For feed hold in a threading cycle,

however, see "Feed hold in a threading cycle"

described below.

- Cutting method

There are four cutting methods.

Tool tip

Tool tip

√2⋅∆d / 2

a

B

1st

a

∆d

2nd

∆d√n

3rd

k

1st

k

4th

2nd

5th

3rd

6th

nth

d (finishing allowance)

d (finishing allowance)

One-edge thread cutting with constant cutting

Both-edge zigzag thread cutting with constant

amount(P1)

cutting amount (P2)

Fig. 6.4.7 (b) One-edge threading with constant cutting amount, both-edge zigzag threading with constant

cutting amount (P1/2)

Tool tip

Tool tip

a

a

∆d

∆d

∆d

∆d

∆d

k

k

∆d

∆d

∆d

∆d

d (finishing allowance)

d (finishing allowance)

One-edge thread cutting with constant depth of cut

Both-edge zigzag thread cutting with constant

(P3)

depth of cut (P4)

Fig. 6.4.7 (c) One-edge threading with constant depth of cut, both-edge zigzag threading with constant depth

of cut (P3/4)

- 307 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

- Repetitive count in finishing

The last finishing cycle (cycle in which the finishing allowance is

removed by cutting) is repeated.

The repetitive count is set in parameter No. 5142.

If the setting is 0, the operation is performed once.

+X

k

+Z

Last finishing cycle

d (finishing allowance)

- Minimum depth of cut

When a cutting method with constant cutting amount is selected (P1

or P2), clamping can be performed with the minimum depth of cut to

prevent the depth of cut from becoming too small.

The minimum depth of cut is set in parameter No. 5140.

Diameter/radius

No.

Unit

Sign

programming

Depends on the increment

Radius

Not

5140

system for the reference axis.

programming

required

- Finishing allowance

The finishing allowance is set in parameter No. 5141.

Diameter/radius

No.

Unit

Sign

programming

Depends on the increment

Radius

Not

5141

system for the reference axis.

programming

required

- 308 -

6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

- Relationship between the sign of the taper amount and tool path

The signs of incremental dimensions for the cycle shown in Fig. 6.4.7

(a) are as follows:

Cutting end point in the direction of the length for U and W:

Minus (determined according to the directions of paths A-C and

C-D)

Taper amount (i):

Minus (determined according to the direction of path A-C)

Height of thread (k):

Plus (always specified with a plus sign)

Depth of cut in the first cut (∆d):

Plus (always specified with a plus sign)

The four patterns shown in the table below are considered

corresponding to the sign of each address. A female thread can also

be machined.

Outer diameter machining

Internal diameter machining

1. U < 0, W < 0, i < 0

2. U > 0, W < 0, i > 0

X

X

W

Z

Z

4(R)

2(F)

i

U/2

3(R)

1(R)

X

U/2

3(R)

1(R)

i

X

2(F)

W

4(R)

3. U < 0, W < 0, i > 0

4. U > 0, W < 0, i < 0

at |i|≤|U/2|

at |i|≤|U/2|

X

X

Z

W

Z

4(R)

1(R)

i

2(F)

X

U/2

3(R)

U/2

3(R)

2(F)

1(R)

i

4(R)

W

X

- Acceleration/deceleration after interpolation for threading

Acceleration/deceleration after interpolation for threading

is

acceleration/deceleration of exponential interpolation type. By setting

bit

5

(THLx) of parameter No.

1610, the same

acceleration/deceleration as for cutting feed can be selected.

(The

settings of bit

0 (CTLx) of parameter No.

1610 are followed.)

However, as a time constant and FL feedrate, the settings of parameter

No. 1626 and No. 1627 for the threading cycle are used.

- 309 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

- Time constant and FL feedrate for threading

The time constant for acceleration/deceleration after interpolation for

threading specified in parameter No.

1626 and the FL feedrate

specified in parameter No. 1627 are used.

- Thread chamfering

Thread chamfering can be performed in this threading cycle. A signal

from the machine tool initiates thread chamfering.

The maximum amount of thread chamfering (r) can be specified in a

range from 0.1L to 12.7L in 0.1L increments in parameter No. 5130.

A thread chamfering angle between 1 to 89 degrees can be specified in

parameter No. 5131. When a value of 0 is specified in the parameter,

an angle of 45 degrees is assumed.

For thread chamfering, the same type of acceleration/deceleration after

interpolation, time constant for acceleration/deceleration after

interpolation, and FL feedrate as for threading are used.

NOTE

Common parameters for specifying the amount and

angle of thread chamfering are used for this cycle

and G92 threading cycle.

- Retraction after chamfering

The following table lists the feedrate, type of acceleration/deceleration

after interpolation, and time constant of retraction after chamfering.

Parameter

Parameter

CFR (No.

Description

No. 1466

1611#0)

0

Other than

Uses the type of acceleration/deceleration after

0

interpolation for threading, time constant for

threading (parameter No. 1626), FL feedrate

(parameter No. 1627), and retraction feedrate

specified in parameter No. 1466.

0

0

Uses the type of acceleration/deceleration after

interpolation for threading, time constant for

threading (parameter No. 1626), FL feedrate

(parameter No. 1627), and rapid traverse rate

specified in parameter No. 1420.

1

Before retraction a check is made to see that the

specified feedrate has become 0 (delay in

acceleration/deceleration is 0), and the type of

acceleration/deceleration after interpolation for

rapid traverse is used together with the rapid

traverse time constant and the rapid traverse

rate (parameter No. 1420).

By setting bit 4 (ROC) of parameter No. 1403 to 1, rapid traverse

override can be disabled for the feedrate of retraction after

chamfering.

- 310 -

6.MEMORY OPERATION

B-64304EN-1/01

PROGRAMMING

USING Series 10/11 FORMAT

NOTE

During retraction, the machine does not stop with

an override of 0% for the cutting feedrate

regardless of the setting of bit 4 (RF0) of parameter

No. 1401.

- Shifting the start angle

Address Q can be used to shift the start angle of threading.

The start angle (Q) increment is 0.001 degrees and the valid setting

range is between 0 and 360 degrees. No decimal point can be

specified.

- Feed hold when the threading cycle retract function is used

Feed hold may be applied during threading in a multiple threading

cycle (G76). In this case, the tool quickly retracts in the same way as

for the last chamfering in a threading cycle and returns to the start

point in the current cycle (position where the workpiece is cut by

∆dn).

When cycle start is triggered, the multiple threading cycle resumes.

X-axis

Ordinary cycle

Motion at feed hold

Z-axis

Cycle start point

Rapid traverse

Cutting feed

Feed hold is applied at this point.

The angle of chamfering during retraction is the same as that of

chamfering at the end point.

CAUTION

Feed hold operation during retraction is disabled.

- Inch threading

Inch threading specified with address E is allowed.

- Tool nose radius compensation

Tool nose radius compensation cannot be applied.

- 311 -

6. MEMORY OPERATION

USING Series 10/11 FORMAT

PROGRAMMING

B-64304EN-1/01

Example

X axis

0

Z axis

6

25

105

G00 X80.0 Z130.0;

G76 X60.64 Z25.0 K3680 D1800 A60 P1 F6.0 ;

Parameter No.5130 = 10(1.0L)

- 312 -

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