HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 97)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 97
2.5 Units—Dr
illing in C axis
"Circular tapping pattern, lateral surface" unit
This unit machines a circular tapping pattern on the lateral surface of
the workpiece.
Unit name: G73_Cir_Mant_C / Cycle: G73 (see page 316)
Use the retraction length for floating tap holders. The cycle
calculates a new nominal pitch on the basis of the thread depth, the
programmed pitch, and the retraction length. The nominal pitch is
somewhat smaller than the pitch of the tap. During tapping, the tap is
pulled away from the chuck by the retraction length. With this method
you can achieve higher service life from taps.
Access to the technology database:
 Machining operation: Tapping
 Affected parameter: 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)
F1 Thread pitch
B Run-in length
L Retraction length when using floating tap holders
(default: 0)
SR Retraction speed (default: Shaft speed for tapping)
RB Return plane
Further forms: see page 56