HEIDENHAIN TNC 426, User Manual

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HEIDENHAIN TNC 426, TNC 430 281
8.5 Cy
cles f
o
r Mac
h
ining Hole P
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tt
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ns
LINEAR PATTERN (Cycle 221)
1 The TNC automatically moves the tool from its current position to
the starting point for the first machining operation.
Sequence:
n
2. Move to 2nd set-up clearance (spindle axis)
n
Approach the starting point in the spindle axis
n
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 reference 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 reference axis direction.
7 This process (6) is repeated until all machining operations in the
second line have been executed.
8 The tool then moves to the starting point of the next line.
9 All subsequent lines are processed in a reciprocating movement.
X
Y
Z
X
Y
Q226
Q225
Q224
Q238
Q237
N = Q242
N = Q243
X
Z
Q200
Q203
Q204
Before programming, note the following:
Cycle 221 is DEF active, which means that Cycle 221 calls
the last defined fixed cycle automatically.
If you combine Cycle 221 with one of the fixed cycles 200
to 208, 212 to 215, 262 to 265 or 267, 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.