
11.SPINDLE SPEED FUNCTION B-63943EN-1/02
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#3 for the third spindle, G029#4 and #5 for the fourth spindle) for the
selected gear, and notify the CNC of them.
Enter the clutch/gear selection signals CTH2 and CTH1 (G070#3 and
#2 for the first spindle, G074#3 and #2 for the second spindle,
G204#3 and #2 for the third spindle, G266#3 and #2 for the fourth
spindle) from the PMC. Notify the serial spindle control unit of these
signals via the CNC, irrespective of the gear selection method.
Changing gears during rigid tapping requires a different process from
that for gear changes during normal machining. As described above,
changing gears conforms to the gear change specifications mentioned
in “SPINDLE SPEED CONTROL” when the M type gear selection
method has been selected. With the T type gear selection method,
changing gears conforms to the logic programmed in the PMC.
Regardless of the option’s selection, if the range in which the spindle
speed specified by the S function code does not correspond to the
currently selected gear, the gears are changed.
The following tables list the spindle speed ranges for each gear during
normal machining (assuming no machine restrictions) and rigid
tapping:
Spindle speed range (normal machining)
Gear
Lower limit Upper limit
Low-spee
d gear
1 revolution
Maximum low-speed gear speed =
Maximum spindle motor speed × L%
=
Low-speed gear ratio
Medium
speed
gear
Maximum
low-speed gear
speed + 1 revolution
Maximum medium-speed gear speed =
Maximum spindle motor speed × L%
=
Medium speed gear ratio
High-spe
ed gear
Maximum
medium-speed gear
speed + 1 revolution
Maximum high-speed gear speed =
Maximum spindle motor speed × L%
=
High-speed gear ratio
NOTE
This table shows an example of three gears. L%
indicates a spindle motor protection constant (up to
100). L can be specified for each gear using
method B for changing in M type gear selection
method (bit 2 (SGB) of parameter No. 3705 =1).