8 coor di na te t ra n s for m ati on cy cle s – HEIDENHAIN TNC 426 (280 476) User Manual
Page 360
HEIDENHAIN TNC 426, TNC 430
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8.8
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Combining coordinate transformation cycles
When combining coordinate transformation cycles, always make sure
the working plane is swiveled around the active datum. You can
program a datum shift before activating Cycle 19. In this case, you are
shifting the “machine-based coordinate system.”
If you program a datum shift after having activated Cycle 19, you are
shifting the “tilted coordinate system.”
Important: When resetting the cycles, use the reverse sequence used
for defining the them:
Automatic workpiece measurement in the tilted system
The TNC measuring cycles enable you to have the TNC measure a work-
piece in a tilted system automatically. The TNC stores the measured
data in Q parameters for further processing (for example, for printout).
Procedure for working with Cycle 19 WORKING PLANE
1 Write the program
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Define the tool (not required, when TOOL.T is active), and enter the
full tool length.
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Call the tool.
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Retract the tool in the tool axis to a position where there is no
danger of collision with the workpiece (clamping devices) during
tilting.
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If required, position the tilt axis or axes with an L block to the
appropriate angular value(s) (depending on a machine parameter).
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Activate datum shift if required.
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Define Cycle 19 WORKING PLANE; enter the angular values for the
tilt axes.
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Traverse all main axes (X, Y, Z) to activate compensation.
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Write the program as if the machining process were to be executed
in a non-tilted plane.
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If required, define Cycle 19 WORKING PLANE with other angular
values to execute machining in a different axis position. In this case,
it is not necessary to reset Cycle 19. You can define the new angular
values directly.
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Reset Cycle 19 WORKING PLANE; program 0° for all tilt axes.
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Disable the WORKING PLANE function; redefine Cycle 19 and
answer the dialog question with NO ENT.
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Reset datum shift if required.
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Position the tilt axes to the 0° position, if required.
1. Activate the datum shift.
2nd: Activate tilting function.
3rd: Activate rotation.
...
Machining
...
1st: Reset the rotation.
2nd: Reset the tilting function.
3rd: Reset the datum shift.