G2: Velocities, setpoint / actual value systems, closed-loop control
7.3 Metric/inch measuring system
Basic Functions
340
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
7.3
Metric/inch measuring system
7.3.1
Conversion of basic system by parts program
Programmable switchover in the measuring system
The basic system can be switched over within a part program via the G functions
G70
/
G71
/
G700
/
G710
(G group
13). The programmed measuring system (
G70
/
G71
/
G700
/
G710
) and the basic system may be identical or
different at any time. When the measuring system is switched over within a particular section of the part program,
this would enable an inch thread to be processed on a workpiece within a metric basic system, for example.
The following section of the part program is executed in "metric" in the basic system:
MD10240 $MN_SCALING_SYSTEM_IS_METRIC = 1
Initial state of the G functions
The initial state for the G functions can be set via the following machine data on a channel-specific basis:
MD20150 $MC_GCODE_RESET_VALUES[12] (reset position for G group 13)
When changing the measuring system via the HMI user interface, the reset position is automatically
preconfigured for compatibility with the new measuring system via
G700
or
G710
.
Displaying length-related data on the HMI
Length-related data is displayed on the HMI in the configured basic system
MD10240 $MN_SCALING_SYSTEM_IS_METRIC (metric basic system).
The following length-related data is displayed in the configured basic system:
• Machine data
• Data in the machine coordinate system
• Tool data
• Work offsets
The following length-related data is displayed in the programmed measuring system:
• Data in the workpiece coordinate system
Program code
Comment
N100 G71
;
;
;
Switchover to metric processing
The conversion factor does not come into effect because the
programmed
measuring system does not differ from the basic system.
....
;
Metric processing
N200 G70
;
;
Switchover to processing in inches
The conversion factor comes into effect.
...
;
Machining in inches
N300
;
Switchover to metric processing
...
;
Metric processing