
B–64113EN–1/01
11. PROGRAM COMMAND
793
In peck drilling, the tool enters and retracts from hole based on an
overload torque detection signal (skip signal) until the designed hole
depth is reached. The spindle speed and cutting feedrate are changed on
each entry of the hole.
The cycle is realized by:
* X– and Y–axis positioning
* Positioning at point R along the Z–axis
* Cutting along the Z–axis (first time, depth of cut Q, incremental)
Repeated until
point Z is reached
Retracting
(bottom of hole → minimum clearance ∆ , incremental)
Retracting
( → to point R, absolute)
Forwarding
(point R → to point with hole bottom + clearance ∆, absolute)
Cutting
(second and subsequent times, cut of depth Q + ∆, incremental)
* Dwell
* Return to point R along the Z–axis (or initial point) = end of cycle
G83(G98) G83(G99)
Q
∆
∆
∆
Q
∆
∆
∆
Initial level
Point R
Point R
Overload torque Overload torque
Point Z
Point Z
Dwell
Dwell
The cutting conditions are changed at each pecking operation (forwarding
→ cutting → retracting) during one G83 cycle. Bits 1 and 2 of parameter
No. 5160 affects the cutting conditions.
11.14
SMALL HOLE PECK
DRILLING CYCLE
(M SERIES)
General
Change of cutting
conditions