HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 376)

376 Fundamentals of cycles
15.5 POLAR P
A
T
T
ERN (Cy
c
le 220)
15.5 POLAR PATTERN (Cycle 220)
Cycle run
1 The TNC moves the tool at rapid traverse from its current position
to the starting point for the first machining operation.
Sequence:
 Move to the 2nd set-up clearance (spindle axis)
 Approach the starting point in the machining plane
 Move to the set-up clearance above the workpiece surface
(spindle axis)
2 From this position the TNC executes the last defined fixed cycle
3 The tool then approaches on a straight line or circular arc the
starting point for the next machining operation. The tool stops at
the set-up clearance (or the 2nd set-up clearance)
4 This process (1 to 3) is repeated until all machining operations have
been executed
Please note while programming:
Cycle 220 is DEF active, which means that Cycle 220
automatically calls the last defined fixed cycle.
If you combine Cycle 220 with one of the fixed cycles, the
set-up clearance, workpiece surface and 2nd set-up
clearance that you defined in Cycle 220 will be effective
for the selected fixed cycle.