Operation Manual

HEIDENHAIN CNC PILOT 4290 221
4.20 Contour-Based Turning Cycles
The CNC PILOT uses the tool definition to distinguish between
external and internal machining.
Program at least NS or NS, NE and P.
D Omit elements. The following undercuts, relief turns and
recesses are not run (default: 0):
G22 G23
H0
G23
H1
G25
H4
G25
H5/6
G25 H7
to H9
D=0••••••
D=1•••–––
D=2••–•••
D=3••––––
D=4••–••–
“•”: Do not machine the elements
 The tool radius compensation: is active.
 A G57 oversize enlarges the contour (also inside
contours).
 A G58 oversize
 >0: Enlarges the contour
 <0: Is not offset
 G57/G58 oversizes are deleted after cycle end.
Cycle run
1 Calculates the areas to be machined and the cutting
segmentation.
2 Approaches workpiece for first pass from starting point, taking
the safety clearance into account.
3 Executes the first cut (roughing).
4 Approaches for the next pass and execute the next cut
(roughing) in the opposite direction.
5 Repeats 3 to 4 until the complete area has been machined.
6 If required, repeats 2 to 5 until all areas have been machined.
7 Retracts as programmed in Q.
Parameters