8 Cycles
4
8.4 Cycles for Machining Hole Patterns
LINEAR PAITERN (Cycle 221)
Process
l
From the current position, the TNC positions the
tool automatically at the starting point of the first
machining operation.
Sequence:
- Traverse 2nd setup clearance
(tool axis).
- Traverse starting point in the
working plane.
- Move to setup clearance above
workpiece surface (tool axis).
l
Here, the TNC carries out the last-defined fixed
cycle.
l
The TNC subsequently positions the tool in the
positive main axis direction at the starting point
of the next machining operation after the tool is
retracted to the setup clearance (or to the 2nd
setup clearance).
l
This process is repeated until all machining
Fig. 8.37: Sequence of LINEAR PAlTERN cycle
operations on the first pass have been carried
out. The tool is positioned at the last point of the
first pass.
l
After this, the TNC moves the tool to the last point of the second pass
and carries out the machining operation there.
l
From there, the TNC positions the tool in the negative main axis
direction at the starting point of the next machining operation.
l
This process is repeated until all machining operations of the second
pass have been carried out. The tool is positioned at the first point of
the second pass.
l
The TNC subsequently moves the tool to the starting point of the next
pass.
l
All subsequent passes are processed in a reciprocating movement.
8-36 TNC 370
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