Programming; Switching Over The System Of Units (G70/G71/G700/G710) - Siemens SINUMERIK 840D Function Manual

Mc axes and spindles

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Example: Increment evaluations for the 1st axis

MD31090 $MA_JOG_INCR_WEIGHT[ 0 ; AX1 ] = 0.001 mm

MD31090 $MA_JOG_INCR_WEIGHT[ 1 ; AX1 ] = 0.00254 mm ≙ 0.0001 inch

In this way, MD31090 does not have to be written at every inch/metric switchover.

Remaining distances are not accumulated during incremental traversing with JOG when the

system of units is changed, since all internal positions always refer to mm.

System of units for sag compensation

The system of units for sag compensation is configured using machine data:

MD32711 $MA_CEC_SCALING_SYSTEM_METRIC

Further information:

Function Manual Monitoring and Compensating; Compensations

Programming

Using the commands of G group 13 (inch/metric system of units) within a part program, you can

switch over between the metric and inch system of units.

In order that commands G700 and G710 are available, the extended system of units

functionality must be switched on (MD10260 $MN_CONVERT_SCALING_SYSTEM = 1).

Axes and spindles

Function Manual, 06/2019, A5E47437747B AA

G2: Velocities, setpoint / actual value systems, closed-loop control

Activating the inch system of units

The inch system of units is used to read and write geometrical data in units of length.

Technological data in units of length (e.g. feedrates, tool offsets, adjustable work offsets,

machine data and system variables) is read and written using the parameterized basic sys‐

Initial setting:

Settable via MD20150 $MC_GCODE_RESET_VALUES

Effectiveness:

2.3 System of units, metric/inch

Sinumerik 840d sl