Fixed Cycles: Pattern Definitions
6.3 LINEAR PATTERN (Cycle 221, DIN/ISO: G221)
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HEIDENHAIN | TNC 320 | User’s manual for cycle programming | 9/2016
6.3 LINEAR PATTERN (Cycle 221,
DIN/ISO: G221)
Cycle run
1 The TNC automatically moves the tool 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 the starting point for the next
machining operation in the positive reference axis direction at
set-up clearance (or 2nd set-up clearance).
4 This process (1 to 3) is repeated until all machining operations
on the first line have been executed. The tool is located above
the last point on the first line.
5 The tool subsequently moves to the last point on the second
line where it carries out the machining operation.
6 From this position, the tool approaches the starting point for
the next machining operation in the negative reference axis
direction.
7 This process (6) is repeated until all machining operations in the
second line have been executed.
8 The tool then moves to the starting point of the next line.
9 All subsequent lines are processed in a reciprocating
movement.
Please note while programming:
Cycle 221 is DEF active, which means that Cycle 221
automatically calls the last defined fixed cycle.
If you combine Cycle 221 with one of the fixed
cycles 200 to 209 and 251 to 267, the set-up
clearance, workpiece surface, the 2nd set-up
clearance, and the rotational position that were
defined in Cycle 221 will be effective.
The slot position 0 is not allowed if you use Cycle
254 Circular Slot in combination with Cycle 221.
If you run this cycle in the Single Block mode of
operation, the control stops between the individual
points of a point pattern.
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