
B–61404E/08
13. FUNCTIONS TO SIMPLIFY
PROGRAMMING
PROGRAMMING
187
When drilling is performed using a tool with an overload torque detection
function, this function allows the small–diameter peck drilling cycle to
be performed by entering an overload torque detection signal as a skip
signal to change the spindle speed and cutting feedrate. The machining
sequence for small–diameter peck drilling is shown below.
Tool
Overload torque
Overload torque
Dwell
Point R
Point Z
Q
∆
∆ : Initial minimal clearance for retraction to point R, and clearance for the start point
(previous end point) in second and subsequent cuttings
Q : Depth of each cut
: Movement at the rapid traverse rate
: Movement at a parameter–set or programmed feedrate
: Movement at a programmed cutting feedrate
Fig. 13.9
The machining sequence of the small–diameter peck drilling cycle is as
follows:
Positioning along the X–axis and Y–axis
Positioning at point R along the Z–axis
Drilling along the Z–axis (maximum depth of cut Q)
Repetition of the following operations along the Z–axis until the
bottom is reached
D Retract (→ Minimal clearance ∆)
D Retract (→ Point R)
D Advance (Point R → Start point + Clearance ∆)
D Cut (Depth of cut Q + ∆)
Dwell at the hole bottom
Return to point R along the Z–axis (or to the initial point)
13.9
SMALL–DIAMETER
PECK DRILLING
CYCLE