FANUC Series 0i-MODEL F Plus. CONNECTION MANUAL (FUNCTION)

6. INTERPOLATION FUNCTION

B-64693EN-1/01

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Serial spindle

Set the parameters correctly according to detector configuration. For detector configuration and the

parameters, refer to FANUC AC SPINDLE MOTOR αi series PARAMETER MANUAL (B-65280EN).

Analog spindle

Connect position coder with 4096 pulses per one rotation of the spindle.

It is enabled that feedback pulses of serial spindle or analog spindle is changed to high precision. For
details, refer to "11.27 IMPROVEMENT OF SPINDLE FEEDBACK PULSES".

When the maximum cutting feedrate is exceeded

If bit 4 (MTA) of parameter No.1612 is 0 and the maximum cutting feedrate (parameter No.1430) is
exceeded, the alarm PS0530

“

EXCESS VELOCITY IN THREADING” is issued as follows:

When the maximum cutting feedrate is exceeded before threading start, the alarm is issued and the

tool stops immediately.

When the maximum cutting feedrate is exceeded after threading start, the alarm is issued and the

tool stops after threading is finished.

This function can detect that the maximum cutting feedrate is exceeded. If the bit 4 (MTA) of parameter
No.1612 is 0, the alarm is not issued.

NOTE

The alarm PS0530 is not issued during dry run.

Limitation

Tool Retract and Recover

When the major axis for threading is specified as the retraction axis, retraction is not performed. In this
case, after a block that does not specify threading is executed, an alarm PS0429, “ILLEGAL
COMMAND IN G10.6” is issued and the tool stops.

Chamfering and Corner R

Chamfering or corner R cannot be specified in a block in which thread cutting is specified. If chamfering
or corner R is specified, alarm PS0050, “CHF/CNR NOT ALLOWED IN THRD BLK”, is issued.

Tool offset

Tool offset cannot be specified in a block in which thread cutting is specified. If tool offset is specified,
alarm PS0509, “TOOL OFFSET COMMAND IS NOT AVAILABLE”, is issued.

Signal

Spindle speed arrival signal SAR<Gn029.4>

[Classification] Input signal

[Function] The SAR signal initiates cutting feed. In other words, if the signal is logical “0”, cutting

feed will not start.

[Operation] Generally, this signal is used to inform the CNC that the spindle has reached the specified

speed. For this purpose, the signal must be set to “1” only after the actual speed of the
spindle has reached the specified speed.
Setting parameter No. 3740 with a wait time before the start of checking the SAR signal
inhibits cutting feed from starting under a condition of SAR = “1” specified before the
change of the spindle command.
To use the SAR signal, it is necessary to set bit 0 (SAR) of parameter No. 3708 to 1. The
CNC checks the SAR signal under the following conditions:
a.

Bit 0 (SAR) of parameter No. 3708 is set to 1.

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Before starting distribution of the first feed (move command) block after shifting
from the rapid traverse mode to the cutting feed mode. This checking is performed
after the time set by parameter No. 3740 has elapsed after the feed block is read.

Before starting distribution of the first feed command block after an S code is
commanded. The wait time for checking is the same as in item b.

When an S code and feed are programmed in the same block, the S code (or
command output to the spindle) is output, and the SAR signal is checked after a
fixed time elapses. If the SAR signal is set to “1”, feed begins.

CAUTION

According to the conditions of item d above, note that if the circuit is
so designed that SAR is turned to “0” simultaneously with the output
of an S code and the change of spindle speed is initiated by the
DEN signal, the operation will stop. That is, the spindle speed does
not reach the commanded speed because the CNC is waiting for
the DEN signal and distribution is not started because the CNC is
waiting for the SAR signal.

Threading signal THRD<Fn002.3>

[Function] This signal indicates that threading is in progress.

[Output cond.] This signal turns to “1” in the following cases:

Threading mode in progress

Threading cycle for turning

This signal turns to “0” in the following case.
-

Neither threading mode nor thread cutting cycle are in progress.

Signal address

Gn029

SAR

Fn002

THRD

Parameter

1401

TDR

[Input type] Parameter input

[Data type] Bit path

#5 TDR

Dry run during threading or tapping (tapping cycle G74 or G84, rigid tapping)

Enabled

Disabled

1402

JRV

NPC

[Input type] Parameter input

[Data type] Bit path

#0 NPC

Feed per revolution without the position coder (function for converting feed per

revolution F to feed per minute F in the feed per revolution mode (G95)) is:
0:

Not used

Used

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#4 JRV

Jog feed or incremental feed is

Performed at feed per minute.

Performed at feed per rotation.

NOTE

Specify a feedrate in parameter No. 1423.

1423

Feedrate in manual continuous feed (jog feed) for each axis

[Input type] Parameter input

[Data type] Real axis

[Unit of data] mm/min, inch/min, deg/min (machine unit)

[Min. unit of data] Depend on the increment system of the applied axis
[Valid data range] Refer to the standard parameter setting table (C)

(When the increment system is IS-B, 0.0 to +999000.0)
(1) When bit 4 (JRV) of parameter No. 1402 is set to 0 (feed per minute), specify a jog

feedrate (feed per minute) under an override of 100%.

(2) When bit 4 (JRV) of parameter No. 1402 is set to 1 (feed per revolution), specify a

jog feedrate (feed per revolution) under an override of 100%.

NOTE

This parameter is clamped to the axis-by-axis manual rapid traverse
rate (parameter No. 1424).

1611

THA

[Input type] Parameter input

[Data type] Bit path

#1 THA

When a threading command is specified in AI contour control mode:

An alarm is issued.

AI contour control mode is temporarily canceled and the command is executed.

NOTE

1 If look-ahead acceleration/deceleration before interpolation is

enabled by the command following or followed by a threading
command with this parameter set to 1, the tool is decelerated to a
stop at the joint of the relevant block.

2 This parameter is automatic setting parameter. For details, refer to

the appendix "Automatic setting / Initial setting parameter" in this
manual.

1612

MTA

[Input type] Parameter input

[Data type] Bit path

#4 MTA

When the maximum cutting feedrate is exceeded in threading, the alarm PS0530 is:

Issued.

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Not issued.

3405

G36

[Input type] Parameter input

[Data type] Bit path

#3 G36

As a G code to be used with the automatic tool length measurement function (M

series)/automatic tool offset function (T series) is:
0:

G36 (T series only)/G37 is used.

G37.1/G37.2/G37.3 is used.

NOTE

If it is necessary to perform circular threading G36
(counterclockwise), set this parameter to 1.

3406

C01

[Input type] Parameter input

[Data type] Bit

#0 C01

When bit 6 (CLR) of parameter No. 3402 is 1, the

key on the MDI panel, the

external reset signal, the reset and rewind signal, or emergency stop signal will,
0:

Clear the G code with group number 01.

Not clear the G code with group number 01.

3451

GQS

[Input type] Parameter input

[Data type] Bit path

#0 GQS

When threading is specified, the threading start angle shift function (Q) is:

Disabled.

Enabled.

3708

TSO

SAT

SAR

TSO

SAR

[Input type] Parameter input

[Data type] Bit path

#0 SAR

The spindle speed arrival signal SAR<Gn029.4> is:

Not checked

Checked

#1 SAT

Check of the spindle speed arrival signal at the start of executing the thread cutting block

The signal is checked only when bit 0 (SAR) of parameter No. 3708 is set to 1.

The signal is always checked irrespective of the setting of SAR.

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NOTE

When thread cutting blocks are consecutive, the spindle speed
arrival signal is not checked for the second and subsequent thread
cutting blocks.

#6 TSO

During a threading or tapping cycle, the spindle override is:

Disabled (tied to 100%).

Enabled.

NOTE

During rigid tapping, the override is tied to 100%, irrespective of the
setting of this parameter.

3713

MPC

[Input type] Parameter input

[Data type] Bit

NOTE

When at least one of these parameters is set, the power must be
turned off before operation is continued.

#6 MPC

When a spindle is selected with address P in a program during multi-spindle control (bit 3

(MPP) of parameter No. 3703 is set to 1), position coder feedback used for thread cutting,
feed per revolution, and so forth is:
0:

Not changed automatically according to the selected spindle.

Changed automatically according to the selected spindle.

NOTE

Setting this parameter produces the same effects as when position
coder select signals PC2SLC<Gn028.7>, PC3SLC<Gn026.0>, and
PC4SLC<Gn026.1>, inter-path spindle feedback signals
SLPCA<Gn064.2>, SLPCB<Gn064.3>, SLPCC<Gn403.4>, and
SLPCD<Gn403.5> are set.
At this time, even when an attempt to set these signals is made by a
PMC ladder, these signal operations are ignored.

11602

NCP

[Input type] Parameter input

[Data type] Bit path

#5 NCP

If there is a non-threading block between two threading blocks, the second threading

block:
0:

Waits until the spindle one-rotation signal and the spindle speed arrival signal SAR
<Gn029.4> are detected.

Does not wait until the spindle one-rotation signal and the spindle speed arrival
signal SAR <Gn029.4> are detected unless a G code in non-threading group 01 is
issued. (FS16

compatible specification)

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Alarm and message

Number

Message

Description

PS0050

CHF/CNR NOT ALLOWED IN THRD
BLK

Chamfering or corner R is commanded in the thread cutting
block. Modify the program.

PS0429

ILLEGAL COMMAND IN G10.6

When retraction was started in the threading block, the retract
command was performed in the longitudinal direction of the
threading.

PS0509

TOOL OFFSET COMMAND IS NOT
AVAILABLE

- Tool offset (for the lathe system) was specified in the

thread cutting block.

- Tool offset was specified (lathe system) in the scaling

mode, coordinate system rotation mode, or programmable
mirror image mode.

PS0530

EXCESS VELOCITY IN THREADING

Feedrate exceeds the maximum cutting feedrate.

Warning

WARNING

During threading, stopping feed without stopping the spindle is dangerous because
the cutting depth will abruptly increase. Feed hold is, therefore, disabled during
threading. If attempted during threading, feed stops in the same way as single block
stop upon the completion of the first non-threading block after the termination of
threading mode. Feed hold lamp signal SPL <Fn000.4>, however, turns to “1”
immediately after feed hold signal *SP <Gn008.5> is set to “1”. The signal SPL
turns to “0” when feed stops (the CNC enters the single block stop state).

Caution

CAUTION

1 Detector with one-rotation signal is required for threading, and it must be

connected with spindle at a gear ratio of 1:1.

2  Feedrate override is ignored during threading, 100% being assumed.
3  During threading, spindle override is ignored, 100% being assumed.
4  When the first non-threading block is executed after threading mode has been

finished, and the feed hold button is pressed again (or the feed hold button has
been held down), the execution of the non-threading block is stopped
immediately.

5 When threading is executed in the single block status, the tool stops after

execution of the first block not specifying threading.

6 When the previous block was a threading block, cutting will start immediately

without waiting for detection of the 1-turn signal even if the present block is a
threading block.

7 When a dry run operation is performed the dry run rate becomes the longitudinal

axis feedrate.

8 The threading retract function is supported only for the threading cycle.

6. INTERPOLATION FUNCTION

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Note

NOTE

Even in the machine lock state, threading detects a one-rotation signal from the
position coder mounted to the spindle.
If threading is specified, and the threading is to be performed without waiting for a
one-rotation signal from the position coder, it is necessary to enable dry run (bit 5
(TDR) of parameter No. 1401 = 0) with the threading command and set the dry
run signal DRN <Gn046.7> to ”1”.
The threading command remains the same regardless of whether the threading
cycle is a canned cycle or a multiple repetitive cycle.
Even if "without position coder feed per revolution" is used (bit 0 (NPC) of
parameter No. 1402 = 1), set the dry run signal DRN to ”1” for threading in the
machine lock state.

Reference item

Manual name

Item name

OPERATOR’S MANUAL (For Lathe System)
(B-64694EN-1)

Threading (G32)

OPERATOR’S MANUAL (For Machining Center
System) (B-64694EN-2)

Threading (G33)

FANUC AC SPINDLE MOTOR

series

PARAMETER MANUAL (B-65280EN)

PARAMETERS RELATED TO DETECTORS

6.5.2

Threading Cycle Retract

When feed hold is performed during threading, the tool immediately retracts while performing
chamfering and then returns to the start point. This function is valid for only canned cycle and multiple
repetitive canned cycle as following table. This function is invalid for threading, variable lead threading,
and circular threading.

Machining

center system

Lathe system

Threading

Cycle Retract

G code system

Canned Cycle

G92

G78

G21

Valid

Multiple Repetitive Canned Cycle

G76

G78

Valid

Threading

G33

G32

G33

Invalid

Variable Lead Threading

G34

Invalid

Circular Threading

G35,G36

Invalid

Circular thread cutting B

G02.1, G03.1

Invalid

The detail of this function is described below.

6.5.2.1

Threading cycle retract (canned cycle)

Overview

When feed hold is performed during threading in threading cycle (G92), the tool immediately retracts
while performing chamfering and then returns to the start point in the order of the plane second axis
(X-axis) followed by the plane first axis (Z-axis).

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Feed hold is enabled here.

Start point

Ordinary cycle

Rapid traverse

Movement during feed hold

X-axis

Z-axis

Cutting feed

Fig. 6.5.2.1 (a)

The chamfering angle during retraction is the same as that at the end point.

Thread chamfering

For the thread chamfering angle, 1

to 89

can be specified with parameter No. 5131. When the parameter

value is 0, 45

is set.

The type of acceleration/deceleration after interpolation, time constant for acceleration/deceleration after
interpolation, and FL feedrate used for thread chamfering are the same as those for threading.

Retraction after chamfering

For retraction after chamfering, the feedrate, type of acceleration/deceleration after interpolation, and time
constant are used as described in the Table 6.5.2.1 (a).

Table 6.5.2.1 (a)

Bit 0 (CFR) of parameter

No.1611

Parameter

No.1466

Description

Non-0

The type of acceleration/deceleration after interpolation for threading
is used together with the threading time constant (parameter
No.1626), FL feedrate (parameter No.1627), and feedrate for
retraction (parameter No.1466).

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).

For the feedrate for retraction after chamfering, the rapid traverse override can be disabled by setting 1 to
bit 4 (ROC) of parameter No.1403.

NOTE

During retraction, the tool does not stop at cutting feedrate override of 0%,

regardless of the setting of bit 4 (RF0) of parameter No.1401.

Rapid traverse override

Rapid traverse override can be disabled during threading cycle retract by setting 1 to bit 7 (RTV) of
parameter No.1403.

FANUC Series 0i-MODEL F Plus. CONNECTION MANUAL (FUNCTION) - page 128