HEIDENHAIN TNC 640, User Manual, Page: 310 / 948

Programming Contours | Path contours – Polar coordinates
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
7.5 Path contours – Polar coordinates
Overview
With polar coordinates you can define a position in terms of its
angle
PA
and its distance
PR
relative to a previously defined pole
CC
.
Polar coordinates are useful with:
Positions on circular arcs
Workpiece drawing dimensions in degrees, e.g. bolt hole circles
Overview of path functions with polar coordinates
Path function key Tool movement Required input Page
+ Straight line Polar radius, polar angle of the
straight-line end point 311
+ Circular path around circle
center/pole to arc end point Polar angle of the arc end point,
direction of rotation 312
+ Circular arc with tangential
connection to the preceding
contour element Polar radius, polar angle of the
arc end point 312
+ Combination of a circular and a
linear movement Polar radius, polar angle of the
arc end point, coordinate of the
end point in the tool axis 313