User's Manual TNC 360 (from 259 900-11) - heidenhain
User's Manual TNC 360 (from 259 900-11) - heidenhain
User's Manual TNC 360 (from 259 900-11) - heidenhain
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8 Cycles<br />
8.2 Simple Fixed Cycles<br />
PECKING (Cycle 1)<br />
<strong>TNC</strong> <strong>360</strong><br />
Process:<br />
• The tool drills at the entered feed rate to the first<br />
pecking depth.<br />
• The tool is then retracted at rapid traverse<br />
(FMAX) to the starting position and advances<br />
again to the first pecking depth, minus the<br />
advanced stop distance t (see calculations).<br />
• The tool advances with another infeed at the<br />
programmed feed rate.<br />
• These steps are repeated until the programmed<br />
total hole depth is reached.<br />
• After a dwell time at the bottom of the hole, the<br />
tool is retracted to the starting position at FMAX<br />
for chip breaking.<br />
1. 2. 3. 4.<br />
A A<br />
Fig. 8.1: PECKING cycle<br />
Input data<br />
• SETUP CLEARANCE A :<br />
Distance between tool tip (at starting position) and workpiece surface<br />
• TOTAL HOLE DEPTH B :<br />
Distance between workpiece surface and bottom of hole (tip of drill<br />
taper)<br />
• PECKING DEPTH C :<br />
Infeed per cut.<br />
If the TOTAL HOLE DEPTH equals the PECKING DEPTH, the tool will<br />
drill to the programmed hole depth in one operation. The PECKING<br />
DEPTH does not have to be a multiple of the TOTAL HOLE DEPTH. If<br />
the PECKING DEPTH is greater than the TOTAL HOLE DEPTH, the tool<br />
only advances to the TOTAL HOLE DEPTH.<br />
• DWELL TIME:<br />
Length of time the tool remains at the total hole depth for chip<br />
breaking.<br />
• FEED RATE:<br />
Traversing speed of the tool when drilling<br />
Calculations<br />
The advanced stop distance is automatically calculated by the control:<br />
• Total hole depth up to 30 mm: t = 0.6 mm<br />
• Total hole depth over 30 mm: t = Total hole depth / 50<br />
maximum advanced stop distance: 7 mm<br />
A<br />
C<br />
A<br />
C<br />
t<br />
t<br />
C<br />
t<br />
A<br />
B<br />
8-5