Shorter-Path Traverse Of Rotary Axes: M126 - HEIDENHAIN iTNC 530 User Manual

Shorter-path traverse of rotary axes: M126

Standard behavior
The behavior of the TNC when positioning the rotary axes
depends on the machine tool The machine tool manual
provides further information.
The behavior of the TNC while positioning rotary axes whose display
has been reduced to values less than 360° depends on Bit 2 of
Machine Parameter 7682. MP7682 sets whether the TNC should
consider the difference between nominal and actual position, or
whether the TNC should always choose the shortest path to the
programmed position or only when M126 is programmed. Examples
of when the TNC should traverse the rotary axis always along the
number line:
Actual position Nominal position
350° 10°
10° 340°
Behavior with M126
With M126, the TNC will move the axis on the shorter path of traverse
for rotary axes whose display is reduced to values less than 360°.
Examples:
Actual position Nominal position
350° 10°
10° 340°
Effect
M126 becomes effective at the start of block.
To cancel M126, enter M127. At the end of program, M126 is
automatically canceled.
HEIDENHAIN iTNC 530
Traverse
–340°
+330°
Traverse
+20°
–30°
429