HEIDENHAIN TNC 360 ISO Programming - Manual (Page 157)

8-4
8 Cycles
TNC 360
Fig. 8.1: PECKING cycle
A
t
A A
A
C
A
t
t
1. 2. 3. 4.
B
C
C
8.2 Simple Fixed Cycles
PECKING G83
Process:
• The tool drills at the entered feed rate to the first
pecking depth.
• The tool is then retracted at rapid traverse to the
starting position and advances again to the first
pecking depth, minus the advanced stop dis-
tance t (see calculations).
• The tool advances with another infeed at the
programmed feed rate.
• These steps are repeated until the programmed
total hole depth is reached.
• After a dwell time at the bottom of the hole, the
tool is retracted to the starting position at rapid
traverse for chip breaking.
Input data
• SETUP CLEARANCE A :
Distance between tool tip (at starting position) and workpiece surface.
• TOTAL HOLE DEPTH B :
Distance between workpiece surface and bottom of hole (tip of drill
taper).
• PECKING DEPTH C :
Infeed per cut.
If the TOTAL HOLE DEPTH equals the PECKING DEPTH, the tool will
drill to the programmed hole depth in one operation. The PECKING
DEPTH does not have to be a multiple of the TOTAL HOLE DEPTH. If
the PECKING DEPTH is greater than the TOTAL HOLE DEPTH, the tool
only advances to the TOTAL HOLE DEPTH.
• DWELL TIME:
Length of time the tool remains at the total hole depth for chip break-
ing.
Calculations
The advanced stop distance is automatically calculated by the control:
• Total hole depth up to 30 mm: t = 0.6 mm
• Total hole depth over 30 mm: t = Total hole depth / 50
maximum advanced stop distance: 7 mm