FANUC Series 30i/300i/300is-MODEL A. Machining Center System. User's manual - page 233

 

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FANUC Series 30i/300i/300is-MODEL A. Machining Center System. User's manual - page 233

 

 

12.SETTING AND DISPLAYING DATA

 OPERATION 

B-63944EN/03

 

 

- 1820 - 

12.4.25 

Machining Parameter Tuning (15-inch Display Unit) 

 
In AI contour control, by setting a velocity-emphasized parameter set 
and precision-emphasized parameter set and setting the precision level 
matching a machining condition such as rough machining or finish 
machining on the precision level setting screen or by programming, 
the parameters suitable for the condition can be automatically 
calculated to perform machining. 
On this screen, the parameter sets for emphasis on velocity (precision 
level 1) and emphasis on precision (precision level 10) can be set. 
Set the following parameters: 

•

 Acceleration rate of acceleration/deceleration before 

interpolation 

•

 

Acceleration change time (bell-shaped) 

•

 

Allowable acceleration change value for each axis in velocity 
control based on acceleration change under jerk control 

•

 

Allowable acceleration change value for each axis in acceleration 
change under jerk control in successive linear interpolation 
operations 

•

 

Ratio of the change time of the rate of change of acceleration in 
smooth bell-shaped acceleration/deceleration before interpolation 

•

 

Allowable acceleration rate 

•

 

Acceleration rate of acceleration/deceleration after interpolation 

•

 

Corner speed difference 

•

 Maximum 

feedrate 

•

 

Items that can be set freely (2 items) 

For details of each parameter, see the descriptions of AI contour 
control and jerk control. 
By setting bit 0 (MPR) of parameter No. 13601 to 1, this screen can be 
hidden. 
For the method of setting a precision level, see the description of the 
precision level selection screen in Subsection 12.3.27. 
 

B-63944EN/03

 OPERATION 

12.SETTING AND DISPLAYING DATA

 

 

- 1821 - 

Procedure for machining parameter tuning 

Procedure 

1 

Set the MDI mode. 

2 

Press function key 

. 

3 

Press vertical soft key [NEXT PAGE] several times to display 
vertical soft key [MCHN TUNING]. The following screen 
appears: 

 

 

Fig. 12.4.25 (a) Machining parameter tuning screen (15-inch) 

 

4  Move the cursor to the position of a parameter to be set, as 

follows: 
Press page key 

 or 

, and cursor keys 

, 

, 

 and /or 

  to move the cursor to the parameter. 

5 

Key in desired data then press the 

  key on the MDI panel. 

6  When data is input, a RMS value is found according to the 

precision level parameters. (The precision level can be changed 
on the precision level selection screen or parameter setting 
screen.) If a RMS value calculation fails, a warning (indicating 
that automatic setting failed) is displayed. 

7 

Repeat steps 4 and 5 until all machining parameters are set. 

8 

In addition to the setting method described above, a parameter 
setting method using horizontal soft keys is available. Pressing 
horizontal soft key [INIT] displays the standard value 
(recommended by FANUC) of the item selected by the cursor in 
the key input buffer. Pressing horizontal soft key [EXEC] 
initializes the item to the standard value. Pressing horizontal soft 
key [GROUP INIT] initializes all items of a group (emphasis on 
velocity or emphasis on precision) selected by the cursor to the 
standard values. 

12.SETTING AND DISPLAYING DATA

 OPERATION 

B-63944EN/03

 

 

- 1822 - 

 
The table below indicates the initial settings. 
 

Table 12.4.25 (a) Initial settings 

AI contour control 

Setting item 

Emphasis 

on velocity

(LV1) 

Emphasis 

on precision 

(LV10) 

Unit 

Acceleration rate of acceleration/deceleration before interpolation 
<ACC FOR BIPL> 

4902.000 1042.000 mm/sec

2

Acceleration change time (bell-shaped) <ACC CHG TIME(BELL)> 

32 

64 

msec 

Allowable acceleration change value <JERK ACC DIFF> 

0 

0 

mm/sec

2

Allowable acceleration change value in successive linear 
interpolation operations <JERK ACC DIFF(LIN)> 

0 0 

mm/sec

2

Ratio of the change time of the jerk control <JERK ACC RATIO> 

0 

0 

% 

Allowable acceleration rate <MAX AACELERATION> 

2977.000 

596.000 

mm/sec

2

Time constant for acceleration/deceleration after interpolation   
<T-CON AIPL ACC/DEC> 

24 24 

msec 

Corner speed difference <CORNER FEED DIFFER> 

1000 

400 

mm/min

Maximum cutting speed <MAX CUT FEEDRATE> 

10000 

10000 

mm/min

 

Explanation 
 - Look-ahead acceleration/deceleration before interpolation 

Set an acceleration rate for a linear portion in look-ahead 
acceleration/deceleration before interpolation. 
Unit of data:    mm/sec

2

, inch/sec

2

, deg/sec

2

 (machine unit) 

 
The parameter set on the machining parameter tuning screen is 
reflected in the following parameters: 
Parameter No. 13610 (velocity-emphasized parameter) 
Parameter No. 13611 (precision-emphasized parameter) 
 
Moreover, the following parameter is also set according to the 
precision level: 
Parameter No. 1660:  Maximum allowable acceleration rate for each 

axis in acceleration/deceleration before 
interpolation 

 

B-63944EN/03

 OPERATION 

12.SETTING AND DISPLAYING DATA

 

 

- 1823 - 

  - Acceleration change time (bell-shaped) 

Set a time constant for a bell-shaped portion in acceleration/ 
deceleration before look-ahead interpolation. 
Unit of data:    ms 
 
The parameter set on the machining parameter tuning screen is 
reflected in the following parameters: 
Parameter No. 13612 (velocity-emphasized parameter) 
Parameter No. 13613 (precision-emphasized parameter) 
 
When bit 7 of parameter No. 13600 is set to 1, the parameter set on the 
machining parameter tuning screen is reflected in the following 
parameters for which the valid data range is extended to the range 
from 0 to 200: 
Parameter No. 13662 (velocity-emphasized parameter) 
Parameter No. 13663 (precision-emphasized parameter) 
 
 
Moreover, the following parameter is also set according to the 
precision level: 
Parameter No. 1772:  Time  constant  for  bell-shaped  look-ahead 

acceleration/deceleration before interpolation of 
constant acceleration time type 

 

 CAUTION 

 

A set time constant is applied to all axes. So, a 
modification made to this item changes the settings 
for all axes. 

 

  - Allowable acceleration change value in velocity control based on acceleration 

change under jerk control 

Unit of data:    mm/sec

2

, inch/sec

2

, deg/sec

2

 (machine unit) 

 
Set an allowable acceleration change value per ms for each axis in 
velocity control based on acceleration change under jerk control. 
 
The parameter set on the machining parameter tuning screen is 
reflected in the following parameters: 
Parameter No. 13614 (velocity-emphasized parameter) 
Parameter No. 13615 (precision-emphasized parameter) 
 
Moreover, the following parameter is also set according to the 
precision level: 
Parameter No. 1788:  Allowable acceleration change value for each 

axis in velocity control based on acceleration 
change under jerk control 

 

NOTE 

 

This setting item is displayed only when the jerk 
control function is enabled. 

 

12.SETTING AND DISPLAYING DATA

 OPERATION 

B-63944EN/03

 

 

- 1824 - 

  - Allowable acceleration change value for each axis in velocity control based on 

acceleration change under jerk control in successive linear interpolation 
operations 

Unit of data:    mm/sec

2

, inch/sec

2

, deg/sec

2

 (machine unit) 

 
Set an allowable acceleration change value per ms for each axis in 
velocity control based on acceleration change under jerk control in 
successive linear interpolation operations. 
 
The parameter set on the machining parameter tuning screen is 
reflected in the following parameters: 
Parameter No. 13616 (velocity-emphasized parameter) 
Parameter No. 13617 (precision-emphasized parameter) 
 
Moreover, the following parameter is also set according to the 
precision level: 
Parameter No. 1789:  Allowable acceleration change value for each 

axis in velocity control based on acceleration 
change under jerk control in successive linear 
interpolation operations 

 

 CAUTION 

1  For an axis with 0 set in this parameter, the 

parameters (allowable acceleration change value 
in velocity control based on acceleration change 
under jerk control: No. 13614, No.13615) are valid. 

2  For an axis with 0 set in the parameter (allowable 

acceleration change value in velocity control based 
on acceleration change under jerk control: No. 
13614, No.13615), velocity control based on 
acceleration change is disabled, so that this 
parameter has no effect. 

 

NOTE 

 

This setting item is displayed only when the jerk 
control function is enabled. 

 

B-63944EN/03

 OPERATION 

12.SETTING AND DISPLAYING DATA

 

 

- 1825 - 

  - Ratio of the change time of the jerk control in smooth bell-shaped 

acceleration/deceleration before interpolation 

Unit of data:    % 
 
Set the ratio (in %) of the change time of jerk control to the change 
time of acceleration in smooth bell-shaped acceleration/deceleration 
before interpolation. 
 
The parameter set on the machining parameter tuning screen is 
reflected in the following parameters: 
Parameter No. 13618 (velocity-emphasized parameter) 
Parameter No. 13619 (precision-emphasized parameter) 
 
Moreover, the following parameter is also set according to the 
precision level: 
Parameter No. 1790:  Ratio of the change time of the jerk control in 

smooth bell-shaped acceleration/deceleration 
before interpolation 

 

NOTE 

 

This setting item is displayed only when the jerk 
control function is enabled. 

 

  - Allowable acceleration rate 

Set an allowable acceleration rate in acceleration-based speed 
determination. 
Unit of data:    mm/sec

2

, inch/sec

2

, deg/sec

2

 (machine unit) 

 
The parameter set on the machining parameter tuning screen is 
reflected in the following parameters: 
Parameter No. 13620 (velocity-emphasized parameter) 
Parameter No. 13621 (precision-emphasized parameter) 
 
Moreover, the following parameter is also set according to the 
precision level: 
Parameter No. 1735:  Allowable acceleration rate for each axis 

applicable to the deceleration function based 
on acceleration in circular interpolation 

Parameter No. 1737:  Allowable acceleration rate for each axis 

applicable to the deceleration function based 
on acceleration in AI contour control 

 

 CAUTION 

 

When bit 0 (MCR) of parameter No. 13600 is set to 
1, the deceleration function based on acceleration 
in circular interpolation is not set. 

 

12.SETTING AND DISPLAYING DATA

 OPERATION 

B-63944EN/03

 

 

- 1826 - 

  - Time constant for acceleration/deceleration after interpolation 

Set a time constant for acceleration/deceleration after interpolation. 
Unit of data:    ms 
 
The parameter set on the machining parameter tuning screen is 
reflected in the following parameters: 
Parameter No. 13622 (velocity-emphasized parameter) 
Parameter No. 13623 (precision-emphasized parameter) 
 
Moreover, the following parameter is also set according to the 
precision level: 
Parameter No. 1769: 

Time  constant  for  acceleration/deceleration 
after cutting feed interpolation 

 

  - Corner speed difference 

Set an allowable corner speed difference used for speed determination. 
Unit of data:    mm/sec, inch/sec, deg/sec (machine unit) 
 
The parameter set on the machining parameter tuning screen is 
reflected in the following parameters: 
Parameter No. 13624 (velocity-emphasized parameter) 
Parameter No. 13625 (precision-emphasized parameter) 
 
Moreover, the following parameter is also set according to the 
precision level: 
Parameter No. 1783:  Allowable  speed difference for each axis in 

automatic corner deceleration based on speed 
difference 

 

  - Maximum cutting speed 

Set a maximum cutting speed for each axis. 
Unit of data:    mm/sec, inch/sec, deg/sec (machine unit) 
 
The parameter set on the machining parameter tuning screen is 
reflected in the following parameters: 
Parameter No. 13626 (velocity-emphasized parameter) 
Parameter No. 13627 (precision-emphasized parameter) 
 
Moreover, the following parameter is also set from the precision level: 
Parameter No. 1432:  Maximum cutting feedrate for each axis in the 

AI contour control mode 

 

B-63944EN/03

 OPERATION 

12.SETTING AND DISPLAYING DATA

 

 

- 1827 - 

 - Arbitrary items 

Two arbitrary parameters can be registered. Each item can correspond 
to a CNC parameter or servo parameter. A parameter number 
corresponding to each item is to be specified with parameters. 
 
As indicated below, set the parameters for corresponding parameter 
numbers, velocity-emphasized parameters (precision level 1), and 
precision-emphasized parameters (precision level 10). 
 

Table 12.4.25 (a)    Parameters related to arbitrary items 

 

Corresponding 

parameter 

number 

Setting of 

velocity-emphasized 

(precision level 1) 

value 

Setting of 

precision-emphasized 

(precision level 10) 

value 

Arbitrary item 1

No.13628 No.13630 

No.13632 

Arbitrary item 2

No.13629 No.13631 

No.13633 

 

•

 Display 

 

Tuning target parameter numbers are displayed. 

 

 CAUTION 

 

As arbitrary items, the numbers of the following 
parameters cannot be specified: 

•

 Bit parameter 

•

  Spindle parameters (Parameter Nos. 4000 to 4799) 

•

 Real-type parameter 

•

 Power-off parameter 

•

 Nonexistent parameter 

 

 

 

 

 

 

 

 

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