HEIDENHAIN CNC Pilot 4290 - Manual (Page 314)

6 TURN PLUS 302
Finishing – Contour machining (G890)
The selected contour area is machined parallel to the contour in one
pass. Chamfers, roundings, and undercuts are taken into account.
For chamfers/roundings, the following applies:
■ The peak-to-valley height or feed rate are not programmed: The CNC
PILOT automatically reduces the feed rate. At least ”FMUR”
revolutions (machining parameter 5) are performed.
■ ”Peak-to-valley height/feed rate” 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).
Parameters
X, Z:
Cutting limit
Type of oversize is set by soft key
L, P: Different longitudinal/transverse oversize – generates
”oversize G57” before the cycle
L: Constant oversize – generates ”oversize G58” before the
cycle
Plunging: Machine descending contours ?
■ Yes
■ No
E: Reduced plunging feed rate with descending contours
Approach:
■ Yes: Set the type of approach Q by soft key
■ No (Q=3): Tool is near the starting point
Q: Type of approach – define by soft key
Retraction:
■ Yes: Set the type of retraction by soft key
■ No (H=4): Tool remains at the end coordinate
H: Type of retraction – define by soft key
I, K: Retraction position with H=0, 1 or 2
Form element machining with ...: Define by soft key the form
elements, chamfers, etc. to be machined.
The CNC PILOT finds the proposed value
of the ”retraction position I,K” depending
on whether you program ”Cycle -
Approach”:
■ programmed: Position from ”Cycle –
Approach”
■ Not programmed: Position of the tool
change point
6.12 Int
er
activ
e
W
o
rking Plan Gener
ation (IWG)