System information

SECTION FOUR - PREPARATORY FUNCTIONS (G CODES)
Metric dimensioning mode (modal) (G21)
This function will cause the system to go into the metric mode. In this mode the system will
accept dimensions in millimeters (mm). In metric the actual machine position may not exactly
agree with the program position because of the conversion. Feedrate in the metric mode is in
millimeters per minute (mmpm).
Note: The CNC does a conversion - -from metric to inch and inch to metric - on all tool
offsets. This means that a 1.0 inch offset entered in the inch mode will change to 25.4 mm
when the system is switched to metric. The reverse happens for metric entries.
Safe zone on/off (G22, G23)
This control is equipped with a programmable safe zone. Any area of the machine's travels can
be designated as a safe zone. This is an area the machine cannot enter. If the machine is
programmed into this area when the safe zone check is enabled, an “attempted to move into safe
zone” error will be displayed. The safe zone is defined in the coordinate parameters. The check
is turned on with a G22 and off with a G23. Active power-up is selectable.
Autoroutines
These G codes select basic patterns which are used repeatedly in most milling applications.
These patterns are circular and rectangular finish cuts, circular and rectangular pocket clearing
and polygons. These routines use the CNC's parametrics to input the various cutting and size dif-
ferences encountered in different applications. The following will explain each G code and give
an example of its use in a program.
All inside autoroutines must be activated with the tool at the center of the routine. Outside
autoroutines can use a G65 (no-move block) to define the center.
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