Designation Of The Axes On Milling Machines; Polar Coordinates - HEIDENHAIN TNC 640 User Manual

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Designation of the axes on milling machines

The X, Y and Z axes on your milling machine are also referred to as

tool axis, principal axis (1st axis) and secondary axis (2nd axis). The

assignment of the tool axis is decisive for the assignment of the

principal and secondary axes.

If the production drawing is dimensioned in Cartesian coordinates,

you also write the NC 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 value of the angle between the angle reference

axis and the line that connects the circle center CC with the

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

Principal axis

Secondary axis

Reference axis of the angle

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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017