HEIDENHAIN TNC 640, User Manual, Page: 284 / 948

Programming Contours | Fundamentals of path functions
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
7.2 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 do this by
entering the coordinates of the end points of the contour elements
given in the production drawing. The control calculates the actual
path of the tool from these coordinates, and from the tool data and
radius compensation.
The control moves all machine axes programmed in the NC block of
a path function simultaneously.
Movement parallel to the machine axes
If the NC block contains one coordinate, the control moves the tool
parallel to the programmed machine 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. Path contours are programmed as
if the tool were moving.
Example
50 L X+100
50
Block number
L
Path function
straight line
X+100
Coordinate of the end point
The tool retains the Y and Z coordinates and moves to the position
X=100.
Movement in the main planes
If the NC block contains two coordinates, the control moves the
tool in the programmed plane.
Example
L X+70 Y+50
The tool retains the Z coordinate and moves on the XY plane to the
position X=70, Y=50.