HEIDENHAIN TNC 370 - 5.5 Path Contours - Polar Coordinates

5 Programming Tool Movements
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5.5
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Path Contours - Polar Coordinates
Polar coordinates are useful for programming:
l Positions on circular arcs
l Positions from workpiece drawings showing
angular dimensions
Section 1.2 “Fundamentals of NC” provides a
detailed description of polar coordinates.
Polar coordinates are marked with a P.
Polar coordinate origin: Pole CC
You can define the pole anywhere in the program before the blocks
containing polar coordinates. Enter the pole in Cartesian coordinates as a
circle center in a CC block.
Y,
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b
x x
cc
Fig. 5.36: The pole is entered as CC
Straight line LP
l You can enter any value from -360” to +360” for PA.
l Enter the algebraic sign for PA relative to the angle reference axis:
For an angle from the reference axis counterclockwise to PR: PA>0
For an angle from the reference axis clockwise to PR: PA<0
Fig. 5.37: Contour consisting of straight
lines with polar coordinates
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TNC 370
5-27