
11.SPINDLE SPEED FUNCTION B-63943EN-1/02
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(3) Rigid tapping and machines with multiple gears
When performing rigid tapping on a machine that has multiple gears,
note the points below.
- M type gear selection method
M
The CNC determines whether gears need changing using the gear
change specification mentioned in section 9.3. If the gears need to be
changed, the CNC generates the S function code read signal SF
<F007#2> and gear selection signals GR1O, GR2O, and GR3O
<F034#0-#2> to notify the PMC. Change gears using the PMC, based
on these signals.
- T type gear selection method
The CNC does not process gear changes. Using the PMC, determine
whether gears need changing, and make the change if needed.
When the CNC has the S function code, it outputs signal SF
<F007#2> and S function code signals S00 to S31 <F022#0-F025#7>
to the PMC. (However, parameter No. 3705 and its related parameters
need to be set for S code and SF signal output).
The PMC side finds a gear whose spindle speed range includes the
spindle speed specified by an S function code. A selected gear is to be
output onto the gear selection signals (G028#1,2 for the first spindle,
G029#0,1 for the second spindle, G029#2,3 for the third spindle, and
G029#4,5 for the fourth spindle) for notification to the CNC.
Regardless of the gear selection method, the clutch/gear selection
signals CTH2 and CHT1 (G070#3,2 for the first spindle, G074#3,2 for
the second spindle, G204#3,2 for the third spindle, and G266#3,2 for
the fourth spindle) corresponding to a gear change are to be input for
notification through the CNC to the serial spindle control unit.
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 section “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: