Linear Pattern (Cycle 221) - HEIDENHAIN TNC 426 B User Manual

Number of repetitions Q241: Number of machining
operations on a pitch circle
Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface. Enter a
positive value.
Workpiece surface coordinate Q203 (absolute value):
Coordinate of the workpiece surface
2nd set-up clearance Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.

LINEAR PATTERN (Cycle 221)

Before programming, note the following:
Cycle 221 is DEF active, which means that Cycle 221
automatically calls the last defined fixed cycle.
If you combine Cycle 220 with one of the fixed cycles
200 to 204 and 211 to 215, 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!
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 (spindle axis)
Approach starting point in the working plane
Move to 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 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.
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 main axis direction.
7 This process (6) is repeated until all machining operations in the
second line have been executed.
HEIDENHAIN TNC 426 B, TNC 430
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