Heidenhain TNC 320 (340 551-02) Manuel d'utilisateur télécharger pdf (Page 56)

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56 4 Programming: Fundamentals of NC, File Management, Programming Aids

4.1 Fundamentals

Polar coordinates

If the production drawing is dimensioned in Cartesian coordinates, you

also write the part program using Cartesian coordinates. For parts

containing circular arcs or angles it is often simpler to give the

dimensions in polar coordinates.

While the Cartesian coordinates X, Y and Z are three-dimensional and

can describe points in space, polar coordinates are two-dimensional

and describe points in a plane. Polar coordinates have their datum at a

circle center (CC), or pole. A position in a plane can be clearly defined

by the:

 Polar Radius, the distance from the circle center CC to the position,

and the

 Polar Angle, the size of the angle between the reference axis and

the line that connects the circle center CC with the position.

See figure at upper right.

Setting the pole and the angle reference axis

The pole is set by entering two Cartesian coordinates in one of the

three planes. These coordinates also set the reference axis for the

polar angle PA.

Coordinates of the pole

(plane)

Reference axis of the angle

X/Y +X

Y/Z +Y

Z/X +Z

0°

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Heidenhain TNC 320 (340 551-02) Manuel d'utilisateur Page 56

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