Polar Coordinates; Absolute And Incremental Dimensions - Siemens SINUMERIK 840D sl Operating Manual

Creating a ShopMill program
7.3 Fundamentals
7.3.2

Polar coordinates

The rectangular coordinate system is suitable in cases where dimensions in the production
drawing are orthogonal. For workpieces dimensioned with arcs or angles, it is better to
define positions using polar coordinates. This is possible if you are programming a straight
line or a circle.
Polar coordinates have their zero point at the "pole".
Example
Points P1 and P2 can then be described – with reference to the pole – as follows:
P1: Radius =100 / angle =30°
P2: Radius =60 / angle =75°
7.3.3

Absolute and incremental dimensions

Absolute dimensions
With absolute dimensions, all the position specifications refer to the currently valid zero
point. Applied to tool movement this means: The absolute dimension data defines the
position, to which the tool is to travel.
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Milling