4. DESCRIPTION OF PARAMETERS
GST The SOR signal is used for:
0 : Spindle orientation
1 : Gear shift
SGB Gear switching method
0 : Method A (Parameters 3741 to 3743 for the maximum spindle speed
at each gear are used for gear selection.)
1 : Method B (Parameters 3751 and 3752 for the spindle speed at the gear
switching point are used for gear selection.)
SGT Gear switching method during tapping cycle (G84 and G74)
0 : Method A (Same as the normal gear switching method)
1 : Method B (Gears are switched during tapping cycle according to the
spindle speed set in parameters 3761 and 3762).
NSF When an S code command is issued in constant surface speed control,
0 : SF is output.
1 : SF is not output.
SFA The SF signal is output:
0 : When gears are switched.
1 : Irrespective of whether gears are switched.
#3 #2 #1
[Data type] Bit
PG2 and PG1 Gear ratio of spindle to position coder
Namber of spindle revolutions
Number of position coder revolutions
Magnification 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.
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 parameters.
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.
The gear selection signal is entered. The spindle
speed corresponding to the gear selected by this signal is
2 When the constant surface speed control option is selected,
type T is selected, regardless of whether this parameter is
3 When type T spindle gear switching is selected, the following
parameters have no effect:
No.3705#2 SGB, No.3751, No.3752, No.3705#3 SGT,
No.3761, No.3762, No.3705#6 SFA, No.3735, No.3736
However, parameter No.3744 is valid.