
B–63173EN–1/01
9. SPINDLE SPEED FUNCTION
385
#7 #6 #5 #4 #3 #2 #1 #0
3706 GTT PG2 PG1
[Data type] Bit
PG2, PG1 Gear ratio of spindle to position coder
Magnifi-
cation
PG2 PG1
1 0 0
2 0 1
4 1 0
8 1 1
GTT Selection of a spindle gear selection method
0: Type M
1 : Type T
NOTE
1 Type M:
The gear selection signal is not entered. In response to an
S command, the CNC selects a gear according to the speed
range of each gear specified beforehand in a parameter.
Then the CNC reports the selection of a gear by outputting
the gear selection signal. The spindle speed corresponding
to the gear selected by the gear selection signal is output.
Type T:
The gear selection signal is entered. The spindle speed
corresponding to the gear selected by this signal is output.
2 When the constant surface speed control option is selected,
type T is selected, regardless of whether this parameter is
specified.
3761
Spindle speed when switching from gear 1 to gear 2 during tapping
3762
Spindle speed when switching from gear 2 to gear 3 during tapping
[Data type] Word
[Unit of data] rpm
[Valid data range] 0 to 32767
When method B is selected (SGT,#3 of parameter 3705, is set to 1) for the
tapping cycle gear switching method, set the spindle speed when the gears
are switched.
Number of spindle revolutions
Number of position coder revolutions
Magnification