
B–63833EN–1/02
9. SPINDLE SPEED FUNCTION
598
This function stops the spindle at a specified position. The spindle can
be stopped in either of the following two ways.
· The spindle is stopped using mechanical stop.
· The spindle is stopped by applying a function of the spindle control
unit.
To mechanically stop the spindle by using, for example, a shot pin, rotate
the spindle at a constant low speed and drive the pin into the spindle. The
spindle can be rotated at a low constant speed by applying either of the
following methods.
· Spindle orientation signal (See 9.3, “Spindle Control.”)
· Spindle output control by the PMC (See 15.4.)
Some spindle control units can position the spindle motor by using
sensors and position coders. The CNC itself does not control positioning
by using these units.
In serial spindle orientation by a position coder, the stop position is
specified either by a parameter or by the PMC (spindle orientation
function with the stop position externally set).
[Classification] Input signal
[Function] This command is used for specifying a stop position with an absolute
position within one rotation in the following equation:
=
4096
360
ȍ (2
i
Pi)
n
i=0
where
Pi = 0 when SHAi = 0
Pi = 1 when SHAi = 1
9.12
SPINDLE
ORIENTATION
General
Mechanical stop
Using the spindle
control unit
Serial spindle orientation
by a position coder
Signal
Spindle orientation
signals with the stop
position externally set
SHA00 to SHA11 for the
first spindle
<G078, G079>
SHB00 to SHB11 for the
second spindle
<G080, G081>