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Shorter-path traverse of rotary axes: m126, 5 miscellaneous functions f or r otary ax es – HEIDENHAIN iTNC 530 (60642x-04) User Manual

Page 519

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HEIDENHAIN iTNC 530

519

12.5 Miscellaneous functions f

or r

otary ax

es

Shorter-path traverse of rotary axes: M126

Standard behavior

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

for if the TNC should traverse the rotary axis always along the number

line:

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:

Effect
M126 becomes effective at the start of block.
To cancel M126, enter M127. At the end of program, M126 is

automatically canceled.

The behavior of the TNC when positioning the rotary axes

depends on the machine tool. The machine manual

provides further information.

Actual position

Nominal position

Traverse

350°

10°

–340°

10°

340°

+330°

Actual position

Nominal position

Traverse

350°

10°

+20°

10°

340°

–30°