Various types of override functions are invalid. The following override functions can be enabled by setting corresponding parameters:
• Extraction override
• Override signal
4.4.4.1 Extraction override
For extraction override, the fixed override set in the parameter or override specified in a program can be enabled at extraction (including retraction during peck drilling/high-speed peck drilling).
Explanation
- Specifying the override in the parameter
Set bit 4 (DOV) of parameter No. 5200 to 1 and set the override in parameter No. 5211.
An override from 0% to 200% in 1% steps can be set. Bit 3 (OVU) of parameter No. 5201 can be set to 1 to set an override from 0% to 2000% in 10% steps.
- Specifying the override in a program
Set bit 4 (DOV) of parameter No. 5200 and bit 4 (OV3) of parameter No. 5201 to 1. The spindle speed at extraction can be specified in the program.
Specify the spindle speed at extraction using address "J" in the block in which rigid tapping is specified.
Example)
To specify 1000 min-1 for S at cutting and 2000 min-1 for S at extraction
. M29 S1000 ;
G84 Z-100. F1000. J2000 ; .
The difference in the spindle speed is converted to the actual override by the following calculation.
Therefore, the spindle speed at extraction may not be the same as that specified at address "J". If the override does not fall in the range between 100% and 200%, it is assumed to be 100%.
100 S
J ×
=
) at (specified speed
Spindle
) at (specified extraction
at speed Spindle
%) ( Override
Bit 6 (OVE) of parameter No. 5202 can be set to 1 to extend the override value to 100% to 2000%. If the specified override value is outside the range between 100% and 2000%, it is assumed to be 100%.
The override to be applied is determined according to the setting of parameters and that in the command as shown in the table below.
When bit 6 (OVE) of parameter No. 5202 is set to 0 DOV=1 Parameter setting
Command OV3=1 OV3=0 DOV=0
Within the range between 100 to 200% Command in the program Spindle speed at extraction
specified at address J
Within the range between 100 to 200% 100%
No spindle speed at extraction specified at address J Parameter No.
5211
Parameter
No. 5211 100%
When bit 6 (OVE) of parameter No. 5202 is set to 1 DOV=1 Parameter setting
Command OV3=1 OV3=0 DOV=0
Within the range between 100 to 2000% Command in the program Spindle speed at extraction
specified at address J
Within the range between 100 to 2000% 100%
No spindle speed at extraction specified at address J Parameter No.
5211
Parameter
No. 5211 100%
NOTE
1 Do not use a decimal point in the value specified at address "J".
If a decimal point is used, the value is assumed as follows:
Example) When the increment system for the reference axis is IS-B
• When pocket calculator type decimal point programming is not used The specified value is converted to the value for which the least input
increment is considered.
"J200." is assumed to be 200000 min-1.
• When pocket calculator type decimal point programming is used
The specified value is converted to the value obtained by rounding down to an integer.
"J200." is assumed to be 200 min-1.
2 Do not use a minus sign in the value specified at address "J".
If a minus sign is used, a value outside the range is assumed to be specified.
3 The maximum override is obtained using the following equation so that the spindle speed to which override at extraction is applied do not exceed the maximum used gear speed (specified in parameters Nos. 5241 to 5244). For this reason, the obtained value is not the same as the maximum spindle speed depending on the override.
100 S
×
=
) at (specified speed
Spindle
) parameters in
(specified speed
spindle Maximum
(%) override Maximum
4 When a value is specified at address "J" for specifying the spindle speed at extraction in the rigid tapping mode, it is valid until the canned cycle is canceled.
4.4.4.2 Override signal
By setting bit 4 (OVS) of parameter No. 5203 to 1, override can be applied to cutting/extraction operation during rigid tapping as follows:
• Applying override using the feedrate override signal
• Canceling override using the override cancel signal
There are the following relationships between this function and override to each operation:
• At cutting
- When the override cancel signal is set to 0 Value specified by the override signal - When the override cancel signal is set to 1 100%
• At extraction
- When the override cancel signal is set to 0 Value specified by the override signal
- When the override cancel signal is set to 1 and extraction override is disabled
100%
- When the override cancel signal is set to 1 and extraction override is enabled
Value specified for extraction override NOTE
1 The maximum override is obtained using the following equation so that the spindle speed to which override is applied do not exceed the maximum used gear speed (specified in parameters Nos. 5241 to 5244).
For this reason, the obtained value is not the same as the maximum spindle speed depending on the
override.
100 S
×
=
) at (specified speed
Spindle
) parameters in
(specified speed
spindle Maximum (%)
override Maximum
2 Since override operation differs depending on the machine in use, refer to the manual provided by the machine tool builder.