HEIDENHAIN SW 54843x-03 DIN Programming - Manual (Page 97)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 97
2.5 Units—Dr
illing in C axis
"Circular pattern drilling, lateral surface" unit
This unit machines a circular hole pattern on the lateral surface of the
workpiece.
Unit name: G74_Cir_Mant_C / Cycle: G74 (see page 331)
Access to the technology database:
 Machining operation: Drilling
 Affected parameters: F, S
Pattern form
Q
Number of holes
ZM, CM Center point of pattern
A Starting angle
Wi Angle increment
K Pattern diameter
W End angle
VD Rotation direction (default: 0)
 VD=0, without W: Figures are arranged on a full circle
 VD=0, with W: Figures are arranged on the longer
circular arc
 VD=0, with Wi: The algebraic sign of Wi defines the
direction (Wi<0: clockwise)
 VD=1, with W: Clockwise
 VD=1, with Wi: Clockwise (algebraic sign of Wi has no
effect)
 VD=2, with W: Counterclockwise
 VD=2, with Wi: Counterclockwise (algebraic sign of Wi
has no effect)
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 Hole depth
IB Hole depth reduction value: Value by which the feed depth
decreases after every advance.
JB Minimum hole depth: If you have entered a hole depth
reduction value, the hole depth is reduced only to the
value entered in JB.
B Retraction distance: Value by which the tool is retracted
after reaching the respective hole depth.