Drilling (Cycle 200) - HEIDENHAIN TNC 370 User Manual

8 Cycles
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8.2 Drilling Cycles
DRILLING (Cycle 200)
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* Program a po&ioning block far
the starting
point @mle center) in the w&&g plane
with radiuI; compensation IW.
* The algetsraic sign fer cycle panmeter UPIll defines
the
working dirwtion.
* Cycle 200 is an abbrevi&ed version of the universal drilling Cycle 203 (sea pge 8-I 0). Internally, however, the
full range
af
functions of Cycle 203 is available, The corresponding
paratieters can-if rsquir&- be
wfoaded
after cycle definMm. FOF this. use the Q parameter function FNQ: ASSIGN.,
Process:
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The TNC positions the tool in the 2 axis at rapid
traverse to the programmed setup clearance
above the workpiece surface.
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The tool drills at the programmed feed rate to
the first pecking depth.
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The TNC moves the tool at rapid traverse FMAX
back to the setup clearance, dwells there-if
this has been specified-and then moves, again
at rapid traverse, to 0.2 mm above the first
pecking depth.
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The tool subsequently drills at the programmed
feed rate by a further pecking depth.
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The TNC repeats this sequence until the pro-
grammed total hole depth is reached.
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From the bottom of the hole, the tool moves at
FMAX to the setup clearance or-if this has
been specified-to the second setup clearance. Fig.
8.3: DRILLING cycle
fnput data
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SET-UP CLEARANCE Q200 (incremental value):
Distance between tool tip and workpiece surface. Enter a positive
value.
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DEPTH Q201 (incremental value):
Distance between workpiece surface and bottom of hole (tip of the drill
taper).
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FEED RATE FOR PECKING 0206:
Traversing speed of the tool when drilling in mm/min.
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PECKING DEPTH 0202 (incremental value):
lnfeed per cut. The TNC moves in one operation to the DEPTH if:
- PECKING DEPTH and DEPTH are identical
- the PECKING DEPTH is greater than the DEPTH.
- PECKING DEPTH = 0
Enter a positive value.
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DWELL TIME AT TOP Q210:
Time in seconds which the tool spends at setup clearance, after the
TNC has withdrawn it from the hole for chip breaking.
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WORKPIECE SURFACE COORDINATE 0203 (absolute value):
Coordinate of the workpiece surface.
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2ND SET-UP CLEARANCE 0204 (incremental value):
Z coordinate at which no collision between tool and workpiece (clamp-
ing devices) can occur. Enter a positive value.
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TNC 370 8-7
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