HEIDENHAIN TNC 370 User Manual page 101

5 Programming Tool Movements
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5.1 General Information on Programming Tool Movements
A tool movement is always programmed as if the
tool is moving and the workpiece is stationary.
Always pn-position the tool at the beginning of a pat-t program to prevent the passibifity of damaging the tool or
workpiece.
Path functions
Each element of the workpiece contour is entered
separately using path functions. The various path
functions produce:
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Straight lines
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Circular arcs
You can also program a combination of the two
(helical paths).
The contour elements are executed in sequence to
machine the programmed contour.
FK Free contour programming
FK free contour programming enables you to enter
workpiece drawing dimensions directly into the part
program even when the drawing is not dimen-
sioned for conventional NC programming.
As in conventional programming, FK programming
describes straight lines and circular arcs. The TNC
calculates the missing information for you.
Fig. 5.1: A contour consists of a combination of straight lines and
circular arcs
Fig. 5.2: Contour elements are programmed and executed in sequence
Fig. 5.3: This drawing was not dimensioned for conventional NC
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TNC 370 -