HEIDENHAIN MANUALplus 620 73
2.5 Units—Drilling in C axis
"Linear pattern drilling, lateral surface" unit
The unit machines a linear drilling pattern in which the individual
features are arranged at a regular spacing on the lateral surface.
Unit name: G74_Lin_Mant_C / Cycle: G74 (see page 299)
Access to the technology database:
Machining operation: Drilling
Affected parameters: F, S
Pattern form
Q Number of holes
Z1, C1 Starting point of pattern
Wi Angle increment
W Final angle
Z2 End point of pattern
Cycle form
X1 Start point drill (starting point of hole; diameter value)
X2 End point drill (end point of hole; diameter value)
E Delay (dwell time at end of hole) (default: 0)
D Retraction at
0: Rapid traverse
1: Feed rate
V Feed rate reduction
0: Without reduction
1: At end of the hole
2: At start of the hole
3: At start and end of the hole
AB Spot drilling / through drilling length (distance for feed rate
reduction)
P 1st hole depth (1st drilling depth)
IB Drilling depth reduction value
JB Minimum hole depth
B Retraction distance
RI Internal safety clearance: Distance for reapproach inside
the hole (default: safety clearance SCK).
RB Return plane (default: return to the starting position or to
the safety clearance)
Further forms: see page 46
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