HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 217)

HEIDENHAIN CNC PILOT 4290 217
4.20 Cont
our
-Based T
u
rn
ing Cy
cles
Program at least NS or NS, NE and P.
Use as 4 axis cycle
„ Same diameter: Both slides start simultaneously.
„ Differing diameters:
„ The second slide starts when the leading slide has reached lead
B. This is synchronized at every step.
„ Each slide advances by the calculated depth of cut.
„ If the slides do not have to execute the same number of cuts, the
leading slide executes the last cut.
„ With constant surface speed, the cutting speed depends on the
speed of the leading slide.
„ The leading tool does not retract until the subsequent tool is ready
for use.
„ 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 (first in X direction, then in Z).
3 Moves at feed rate to target point X.
4 Depending on H:
„ H=0: Machines the contour outline
„ H=1 or 2: Retracts at 45°
5 Returns at rapid traverse and approaches for next pass.
6 Repeats 3 to 5 until target point Z has been reached.
7 If required, repeats 2 to 6 until all areas have been machined.
8 If H=1: Smooths the contour
9 Retracts as programmed in Q.
On 4 axis cycles, ensure that the tools are identical (tool
type, cutting edge radius, cutting edge angle, etc.).