8 Cycles
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8.4 Cycles for Machining Hole Patterns
CIRCULAR PATTERN (Cycle 220)
NOW
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Cycle 220 is DEF-atiive, that ia ta say that Cycls 226 auromatically calls the kWdefined fixed qfz%%
* ff one af the fixed Cycles 200 to 215 is combinti w&h Cycle 220, the serup ciearance, the workpiece surface
and Thea second s&up ctearance function from Cycle 220 ars in affect.
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Process
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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).
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Here, the TNC carries out the last-defined fixed cycle.
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The TNC subsequently positions the tool with a straight-line movement
at the starting point of the next machining operation after the tool is
retracted to the setup clearance (or to the 2nd setup clearance).
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This process is repeated until all machining operations have been
carried out.
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input data
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CENTER IN 1ST AXIS Q216 (absolute value):
Center of the pitch circle on the main axis of the working plane.
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CENTER IN 2ND AXIS 0217 (absolute value):
Center of the pitch circle on the secondary axis of the working plane.
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PITCH CIRCLE DIAMETER Q244 (absolute value):
Diameter of the pitch circle.
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STARTING ANGLE Q245 (absolute value):
Angle from the main axis of the working plane to the starting point of
the first machining operation on the pitch circle.
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STOPPING ANGLE Q246 (absolute value):
Angle from the main axis of the working plane to the starting point of
the last machining operation on the pitch circle. Enter the stopping
angle to be not equal to the starting angle.
If the stopping angle is entered to be greater than the starting angle,
machining will be carried out counterclockwise, otherwise machining
will be carried out clockwise.
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ANGULAR STEP 0247 (incremental value):
Angle between two machining operations on the pitch circle. If you
enter an angular step of 0, the TNC calculates the angular step from the
starting angle and the stopping angle. If you enter an angular step that
is not equal to 0, the TNC does not take the stopping angle into ac-
count. The sign for angular step defines the machining direction
(- = clockwise).
. NUMBER OF REPETITIONS Q241:
Number of machining operations on the pitch circle.
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SET-UP CLEARANCE Q200 (incremental value):
Distance between tool tip and workpiece surface. Enter a positive
value.
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WORKPIECE SURFACE COORDINATE Q203 (absolute value):
Coordinate of the workpiece surface.
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2ND SET-UP CLEARANCE Q204 (incremental value):
Z coordinate at which no collision between tool and workpiece (clamp-
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Fig. 8.36: Input parameters, CIRCULAR
PATTERN cycle
ing devices) can occur. Enter a positive value.
TNC 370
8-35
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