
B-63944EN-1/02 PROGRAMMING 4.FUNCTIONS TO SIMPLIFY PROGRAMMING
- 115 -
4.4.4 Override during Rigid Tapping
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