HEIDENHAIN TNC 426 (280 476) Pilot - Manual (Page 99)

100
ISO
Programming
Defining the Working Plane
G17 X / Y working plane, tool axis Z
G18 Z /X working plane, tool axis Y
G19
Y/ Z working plane, tool axis X
G20
Fourth axis is tool axis
Chamfer, Rounding, Approach/Departure
G24* Chamfer with side length R
G25* Corner rounding with radius R
G26* Tangential contour approach on an arc with radius R
G27* Tangential contour departure on an arc with radius R
Tool Definition
G99* Tool definition in the program with length L and
radius R
Tool Radius Compensation
G40 No radius compensation
G41
Radius compensation to the left of the contour
G42
Radius compensation to the right of the contour
G43 Paraxial radius compensation: the path is
lengthened
G44
Paraxial radius compensation: the path is
shortened
Dimensional Data
G90 Absolute dimensions
G91 Incremental (chain) dimensions
Unit of Measure (at Beginning of Program)
G70
Inches
G71
Millimeters
Blank Form Definition for Graphics
G30
Setting the working plane, MIN point coordinates
G31 Dimensional data (with G90, G91),
coordinates of the MAX point
Other G functions
G29
Define last nominal position value as pole
G38
Stopping the program run
G51* Calling the next tool (only with central tool file)
G98* Setting a label number
*) Effective blockwise