
9.SPINDLE FUNCTION B-63783EN-1/01
- 920 -
Sequence(Time chart)
The following is an example of the PMC processing procedure used
when rigid tapping is specified:
1. Assume that the G84.2 command is specified. The spindle speed
must be specified with an S command in the block containing
G84.2 or in a block before that block.
2. The CNC starts movement along the X- and Y-axes to the tapped
hole position and simultaneously sets rigid tapping signal RTAP
to 1.
3. When the G84.2 command is specified, the spindle may have
already been stopped by M05 which may have been specified
before G84.2, or the spindle may be rotating at a speed specified
by the S command with M03 or M04 maintained. In either case,
when the RTAP signal is set to 1, the machine (PMC) must
perform the following:
(1) Set all the spindle motor command voltage signals to 0 so that
the spindle speed voltage from the CNC becomes 0 V on the
spindle amplifier side. Also reset, to 0, the spindle normal
rotation command SFR and the spindle reverse rotation
: Rapid traverse
: Z axis feed
: Dwell
P
G84.2(G98) G84.2(G99)
G84.2 X_ Y_ Z_ R_ P_ F_ L_ S_ ;
X_ Y_: Hole position data
Z_ : The distance from point R to the bottom of the hole and the position o
the bottom of the hole
R_ : The distance from the initial level to point R level
P_ : Dwell time at the bottom of the hole and at point R when a return is
made
F_ : Cutting feedrate
L_ : Number of repeats (Only for necessity of repeat)
Initial level
Point R
Spindle
sto
Spindle CW
Point Z
P
Point R level
Operation2
Operation1
Operation6
Operation3
Operation4
Operation5
Spindle stop
Spindle CCW
Point R
Spindle CW
Point Z
P
Point R level
Spindle stop
Spindle CCW
Spindle stop
Spindle stop
Spindle stop
P
S_ : Spindle speed