HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 204)

8 Programming: Cycles 188
ú Number of repetitions Q241: Number of machining
operations on a pitch circle
ú Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface. Enter a
positive value.
ú Workpiece surface coordinate Q203 (absolute value):
Coordinate of the workpiece surface
ú 2nd set-up clearance Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.
The TNC 426, TNC 430 with NC software 280 474-xx
also provides:
ú Traversing to clearance height Q301: definition of how
the tool is to move between machining processes:
0: Move to set-up clearance
1: Move to 2nd set-up clearance
LINEAR PATTERN (Cycle 221)
Before programming, note the following:
Cycle G221 is DEF active, which means that Cycle G221
automatically calls the last defined fixed cycle.
If you combine Cycle G220 with one of the fixed cycles
G200 to G208 and G212 to G215, the set-up clearance,
workpiece surface and 2nd set-up clearance that you
defined in Cycle G220 will be effective for the selected
fixed cycle.
1 The TNC automatically moves the tool from its current position to
the starting point for the first machining operation.
The tool is positioned in the following sequence:
■ Move to 2nd set-up clearance (tool axis)
■ Approach starting point in the working plane
■ Move to set-up clearance above the workpiece surface
(tool 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 main 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.
X
Y
Z
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