HEIDENHAIN TNC 426 (280 476) - Manual (Page 156)

HEIDENHAIN TNC 426, TNC 430 129
6.2 F
undamentals of P
a
th F
unctions
6.2 Fundamentals of Path
Functions
Programming tool movements for workpiece
machining
You create a part program by programming the path functions for the
individual contour elements in sequence. You usually do this by
entering the coordinates if the end points of the contour elements
given in the production drawing. The TNC calculates the actual path of
the tool from these coordinates, and from the tool data and radius
compensation.
The TNC moves all axes programmed in a single block simultaneously.
Movement parallel to the machine axes
The program block contains only one coordinate. The TNC thus moves
the tool parallel to the programmed axis.
Depending on the individual machine tool, the part program is
executed by movement of either the tool or the machine table on
which the workpiece is clamped. Nevertheless, you always program
path contours as if the tool moves and the workpiece remains
stationary.
Example:
The tool retains the Y and Z coordinates and moves to the position
X=100 (see figure at upper right).
Movement in the main planes
The program block contains two coordinates. The TNC thus moves the
tool in the programmed plane.
Example:
The tool retains the Z coordinate and moves in the XY plane to the
position X=70, Y=50 (see figure at center right).
Three-dimensional movement
The program block contains three coordinates. The TNC thus moves
the tool in space to the programmed position.
Example:
L X+100
L Path function for “straight line”
X+100 Coordinate of the end point
L X+70 Y+50
L X+80 Y+0 Z-10
X
Y
Z
100
X
Y
Z
70
50
X
Y
Z
80
-10