HEIDENHAIN CNC Pilot 4290 - Manual (Page 316)

6 TURN PLUS 304
Finishing – Residual-contour machining (G890 – Q=4)
Using the ”Roughing hollowing - residual roughing ..” function, you can
remove residual material from sloping contours.
Cutting limitation: The finishing operation begins with the residual
material. Normally a cutting limit is not necessary.
Residual finishing (G890 – Q4) checks whether the tool
can move into the contour valley without a collision. The
collision check is based on tool parameter ”width dn” (see
”
8.1.2 Tool Data”).
Parameters
X, Z:
Cutting limit
Setting the oversize type: 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
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)