HEIDENHAIN TNC 310 (286 140) - Manual (Page 140)

8 Programming: Cycles 128
ú Stepping angle Q247 (incremental value): Angle
between two machining operations on a pitch circle. If
you enter a stepping angle of 0, the TNC will calculate
the stepping angle from the starting and stopping
angles. If you enter a value other than 0, the TNC will
not take the stopping angle into account. The sign for
the stepping angle determines the working direction
(– = clockwise).
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.
LINEAR PATTERN (Cycle 221)
Before programming, note the following:
Cycle 221 is DEF active, which means that Cycle 221
calls the last defined fixed cycle.
If you combine Cycle 221 with one of the fixed cycles
200 to 204 and 212 to 215, the set-up clearance,
workpiece surface and 2nd set-up clearance that you
defined in Cycle 221 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 setup clearance (tool axis)
■ Approach starting point in the machining plane
■ Move to setup 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.
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