HEIDENHAIN CNC Pilot 4290 - Manual (Page 318)

6 TURN PLUS 306
6.12.8 Thread Machining(G31)
Parameters
B, P:
Starting length, overrun length - no input: The CNC PILOT
automatically determines the length from adjacent undercuts
or recesses. If no undercut/recess exists, the starting length
and overrun length from machining parameter 7 will be used
(see also ”
4.8 Thread Cycles”).
C: Starting angle - necessary when the starting point of the
thread is defined with respect to contour elements that are
not rotationally symmetric
I: Maximum approach - maximum infeed distance
V: Type of infeed
■ Constant cross section (V=0): Constant cross section for
all cuts
■ Constant approach (V=1)
■ Remaining cut division (V=2): If the division thread depth/
infeed leaves a remainder, the first feed is reduced. The ”last
cut” is divided into 1/2, 1/4, 1/8 and 1/8 of a cut.
■ EPL method (V=3): The infeed is calculated from the pitch
and the speed
H: Type of tool offset of the individual infeeds to smooth the
thread flanks
■ H=0: No offset
■ H=1: Offset from left
■ H=2: Offset from right
■ H=3: Offsets alternates right/left
Q: Number of air cuts – after the last cut (for reducing the
cutting pressure in the thread base)
6.12 Int
er
activ
e
W
o
rking Plan Gener
ation (IWG)
Danger of collision!
An excessive overrun length P might
cause a collision. The overrun length can
be checked during the simulation.