Example 6: "Hirth Axis - Siemens SINUMERIK 840D Function Manual

T1: Indexing axes
8.6 Examples
The following indexing positions are obtained:
-200, -190, -180, ... 180, 190, 200 [mm]
Indexing data
MD30501 $MA_INDEX_AX_NUMERATOR[ AX4 ] = 10.0
MD30502 $MA_INDEX_AX_DENOMINATOR[ AX4 ] = 1
MD30503 $MA_INDEX_AX_OFFSET[ AX4 ] = -200.0
MD30505 $MA_HIRTH_IS_ACTIVE[ AX4 ] = 0
Defining machine axis AX4 as linear axis and equidistant indexing axis
MD30300 $MA_IS_ROT_AX[ AX4 ] = 0
MD30310 $MA_ ROT_IS_MODULO[ AX4 ] = 0
MD30500 $MA_INDEX_AX_ASSIGN_POS_TAB[ AX4 ] = 3
MD36100 $MA_POS_LIMIT_MINUS[ AX4 ] = -200.0
MD36110 $MA_POS_LIMIT_PLUS[ AX4 ] = 200.0
8.6.6

Example 6: "Hirth axis"

Machine axis AX4 is a "Hirth axis" (rotary modulo axis with equidistant indexing and Hirth
gearing). The equidistant indexing positions are every 1°, starting at 0°.
Indexing data
MD30501 $MA_INDEX_AX_NUMERATOR[ AX4 ] ⇒
MD30330 $MA_MODULO_RANGE[ AX4 ] = 360.0
MD30502 $MA_INDEX_AX_DENOMINATOR[ AX4 ] = 360
MD30503 $MA_INDEX_AX_OFFSET[ AX4 ] = 0.0
MD30505 $MA_HIRTH_IS_ACTIVE[ AX4 ] = 1
Defining machine axis AX4 as linear axis and equidistant indexing axis
MD30300 $MA_IS_ROT_AX[ AX4 ] = 1
MD30310 $MA_ ROT_IS_MODULO[ AX4 ] = 1
MD30500 $MA_INDEX_AX_ASSIGN_POS_TAB[ AX4 ] = 3
MD36100 $MA_POS_LIMIT_MINUS[ AX4 ] = -200.0
MD36110 $MA_POS_LIMIT_PLUS[ AX4 ] = 200.0
256
Numerator = 10
Denominator = 1
First indexing position = -200.0°
No Hirth gearing
Linear axis
Modulo function is not active
Equidistant indexing axis
1st software limit switch minus = -200.0
mm
1st software limit switch plus = 200.0
mm
This value is ignored for rotary modulo
axes, and MD30330 $MA_MODU‐
LO_RANGE (default value: 360°) is
used instead.
Number of indexing positions = 360° / 1°
= 360
First indexing position = 0.0°
Hirth gearing
Rotary axis
Modulo function active
Equidistant indexing axis
1st software limit switch minus = -200.0
mm
1st software limit switch plus = 200.0
mm
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA