HEIDENHAIN TNC 410 - Manual (Page 130)

117 HEIDENHAIN TNC 410
7.
5 Miscellaneous F
unctions f
o
r
Rotary A
x
e
s
Standard behavior of the TNC
Actual position Nominal position Traverse
350° 10° –340°
10° 340° +330°
Behavior with M126
Actual position Nominal position Traverse
350° 10° +20°
10° 340° –30°
7.5 Miscellaneous Functions for
Rotary Axes
Shorter-path traverse of rotary axes: M126
Standard behavior
If you reduce display of a rotary axis to a value less than 360°, the
TNC will move the axis by the difference between the nominal and
actual positions. The table at upper right shows examples.
Behavior with M126
With M126, the TNC will move the axis on the shorter path of
traverse if you reduce display of a rotary axis to a value less than
360°. The table at lower right shows examples.
Effect
M126 becomes effective at the start of block. To cancel M126,
enter M127. At the end of program, M126 is automatically canceled.
Reducing display of a rotary axis to a value less than
360°: M94
Standard behavior
The TNC moves the tool from the current angular value to the
programmed angular value.
Example:
Current angular value:
538°
Programmed angular value: 180°
Actual path of traverse: –358°
Behavior with M94
At the start of block, the TNC first reduces the current angular value
to a value less than 360° and then moves the tool to the
programmed value. If several rotary axes are active, M94 will
reduce the display of all rotary axes.
Example NC blocks
To reduce display of all active rotary axes:
L M94
To reduce display of all active rotary axes and then move the tool in
the C axis to the programmed value:
L C+180 FMAX M94
Effect
M94 is effective only in the block in which M94 is programmed.
M94 becomes effective at the start of block.