HEIDENHAIN CNC Pilot 4290 - Manual (Page 307)

HEIDENHAIN CNC PILOT 4290 295
Recess turning (G869)
The CNC PILOT machines the material using alternate recessing and
roughing movements.
Parameters
P:
Maximum cutting depth
R: Depth compensation - depending on factors such as
workpiece material or feed rate, the tool tip ”tilts” during a
turning operation. You can correct this infeed error with
”turning depth compensation factor” R. The compensation is
usually determined empirically.
B: Offset width – After the second infeed movement, during the
transition from turning to recessing, the path to be machined
is reduced by ”offset width B.” Each time the system
switches from turning to recessing on this side, the path is
reduced by ”B” - in addition to the previous offset. After
precutting, the remaining material is removed with a single
cut.
A, W: Approach angle, departure angle – reference: Z axis - default:
opposite from the recessing direction
X, Z: Cutting limit
Type of oversize is set by soft key
I, K: Different longitudinal/transverse oversize
I: Constant oversize – generates ”oversize G58” before the
cycle
S: (Unidirectional/) bidirectional – setting by soft key
Precutting is performed:
■ Yes (S=0): bidirectional
■ No (S=1): unidirectional in the direction defined during the
selection of the machining area
O: Recessing feed rate – default: Active feed rate
E: Finishing feed – default: Active feed
H: Type of retraction at cycle end
■ H=0: Return to starting point (axial: first Z, then X direction;
radial: first X, then Z direction)
■ H=1: Positions before the finished contour
■ H=2: Retracts to the safety clearance and stops
Process: Setting by soft key
■ Pre-cutting and finishing in one machining cycle
■ Only pre-cutting
■ Only finishing
”Recess turning” soft keys
Select longitudinal/transverse oversize
or constant oversize.
Unidirectional/Bidirectional
Precutting and finishing
Precutting
Finish-machining
6.12 Int
er
activ
e
W
o
rking Plan Gener
ation (IWG)