List of Preparatory Functions

Typical preparatory functions that are generally present in most of the machining centres are given below:

Motion group

*G00   Rapid Positioning

G01     Linear Interpolation

G02     Circular interpolation Clockwise

G03     Circular interpolation Counter clockwise

Dwell

G04     Dwell

Active Plane Selection Group

*G17   XY Plane selection

G18     XZ Plane selection

G19     YZ Plane selection

Cutter Compensation Group

*G40   Cutter compensation, Cancel

G41     Cutter radius Compensation left

 G42    Cutter radius Compensation right

Units Group

*G70   Inch units

G71     Metric units

Hole Making Canned Cycle Group

*G80   Canned Cycle Cancel

G81-G89         Canned Cycles definition and ON

Co-ordinate System Group

*G90   Absolute co-ordinate system

G91     Incremental co-ordinate system

 Preset

G92     Absolute pre-set, Change the datum position

The * sign indicates the generally accepted default or turn on code in operation. However, this is not generally true with all the controllers and care have to be taken to check with the programming manual of the controller.