Operation Manual

HEIDENHAIN CNC PILOT 4290 525
6.14 Interactive Working Plan Generation (IWG)
Thread machining (G31)
The IWG generates the cycle G31 for the selected thread.
Parameters
B Run-in length
 No input: The CNC PILOT automatically determines the
length from adjacent undercuts or recesses.
 No input, no undercut/recess: The CNC PILOT uses the
thread starting length from machining parameter 7.
P Overrun length
 No input: The CNC PILOT automatically determines the
length from adjacent undercuts or recesses.
 No input, no undercut/recess: The CNC PILOT uses the
thread run-out length from machining parameter 7.
C Starting angle, if the beginning of the thread is defined with
respect to rotationally nonsymmetrical contour elements
I Maximum infeed
V Type of infeed
 V=0: Constant cross section for all cuts
 V=1: Constant infeed
 V=2 (distribution of remaining cuts): If the division thread
depth/infeed provides a remainder, the first infeed is
reduced. The last cut is divided into four partial cuts: 1/2, 1/4,
1/8 and 1/8
 V=3 (EPL method): Infeed is calculated from the pitch and
spindle speed
H Type of offset used for the individual infeeds for smoothing the
thread sides
 H=0: Without offset
 H=1: Offset from left
 H=2: Offset from right
 H=3: Tool is offset alternately from the right and left
Q Number of air cuts after the last cut (for reducing the cutting
pressure in the thread base)
Danger of collision!
An excessive overrun length P might cause a collision. You
can check the overrun length during the simulation.