HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 522)

522
6.14 Int
e
ra
ctiv
e W
o
rk
ing Plan Gener
a
tion (IWG)
Residual-contour machining: Using the “Residual-contour
machining” function, you can remove residual material from
descending contours (see illustration of “G890 Q4”). Normally a
cutting limit is not necessary.
Hollowing: The IWG machines recess areas determined with the aid
of the “inward copying angle” (recesses: inward copying angle <=
mtw). For Finishing – Hollowing, you should use neutral tools.
For chamfers/rounding arcs, the following applies:
„ The “Feed/Peak-to-valley” attribute is not programmed: The CNC
PILOT automatically reduces the feed rate. At least “FMUR”
revolutions (machining parameter 5) are performed.
„ “Feed/Peak-to-valley” attribute programmed: No feed rate
reduction.
„ There is no feed-rate reduction for chamfers/rounding arcs that, due
to their size, are machined with at least FMUR revolutions
(machining parameter 5).
H Type of retraction. The tool retracts at 45° in the opposite
direction to the machining direction. The subsequent retraction
path is defined by H:
„ H=0: Diagonally to retraction position
„ H=1: First X, then Z direction
„ H=2: First Z, then X direction
„ H=3: Backs off at feed rate to the safety clearance
I Retraction position with H=0, 1, 2
K Retraction position with H=0, 1, 2
Form element machining: Setting by soft key
The display field shows the form elements to be machined (for
abbreviations see soft key table). The following form elements
are always machined:
„ C: Chamfer
„ R: Rounding
„ PT: Fit
„ GW: Thread
Parameters
X
Z
G890 Q4
The approach strategy is predefined for remaining-contour
machining and hollowing. The IWG generates the cycle
G890 with “type of approach Q4.”
The value proposed for the retraction position I,K depends
on whether you program “Cycle > Approach:”
„ If programmed: Position from “Cycle > Approach”
„ If not programmed: Position of the tool change point