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7.
Tapping Compound Fixed Cycle
7-1.
Right-hand Tapping Cycle (G77)
[Function]
The compound cycle called out by G77 executes a tapping cycle like the one illustrated below.
Q
2
[Programming format]
G77 X__ Z__ K__ F__
G77 : G code to call out tapping compound fixed cycle.
Specify this G code immediately after a sequence number (name).
X
: X coordinate of tapping cycle start point (target point)
Z
: Z coordinate of tapping cycle end point (target point)
K
: Rapid axis feedrate for axis feed from the cycle start point to the cutting start point
F
: Feedrate
Axis movements:
Q
: The X-axis is positioned at the specified positioning target point (cycle start point) at a
1
rapid feedrate. In this positioning cycle, no Z-axis movement occurs and thus the turret
must be positioned at a point where it will not interfere with the workpiece during this
positioning before calling out the G77 cycle.
Q
: The spindle rotates clockwise at the speed applying before the G77 cycle is called.
2
Therefore, the required spindle speed must be specified before calling the G77 cycle.
If this compound fixed cycle is called without designating a spindle speed, axis infeed does
not occur since the spindle does not rotate and thus the cycle is halted.
Q
: The Z-axis is positioned at a position designated by a K word at a rapid feedrate.
3
Q
: Tapping is performed from the point reached in Q
4
specified feedrate (F).
Q
: The spindle stops once and then starts in the reverse direction at the same speed as used
5
in infeeding.
Q
: The Z-axis retracts to a point reached in the Q
6
Q
: The Z-axis retracts to a point reached in the Q
7
Q
5
Z
(Actual Example)
Q
1
Q
Q
2
5
Q
Q
4
3
X
Q
7
Q
6
K
to the depth specified by a Z word at a
3
cycle at a cutting feedrate.
4
cycle at a rapid feedrate.
3
SECTION 7 FIXED CYCLES
Q
Q
4
3
Q
Q
6
7
Z
K
(Diagram)
5238-E P-130
Q
1
X
LE33013R0300900240001
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