Polar Coordinates; Straight Polar - Siemens SINUMERIK 828D Operating Manual

8.5.11

Polar coordinates

If a workpiece has been dimensioned from a central point (pole) with radius and angles, you
will find it helpful to program these as polar coordinates.
You can program straight lines and circles as polar coordinates.
Defining a pole
You must define the pole before you can program a straight line or circle in polar
coordinates. This pole acts as the reference point of the polar coordinate system.
The angle for the first line or circle then needs to be programmed in absolute coordinates.
You can program the angles for any additional straight lines and circles as either absolute or
incremental coordinates.
Procedure
Parameter
X
Y
8.5.12

Straight polar

A straight line in the polar coordinate system is defined by a radius (L) and an angle (α). The
angle refers to the X axis.
The tool moves from its actual position along a straight line to the programmed end point at
the machining feedrate or in rapid traverse.
The 1st straight line in polar coordinates entered after the pole must be programmed with an
absolute angle. You can program any additional straight lines or circles with incremental
coordinates.
HMI sl Milling
Operating Manual, 06/2009, 6FC5398-7CP20-0BA0
1. The ShopMill program to be edited has been created and you are in
the editor.
2. Press the menu forward key and the "Polar" softkey.
3. Press the "Pole" softkey.
Description
Pole X (abs) or pole X referred to the last programmed position (inc)
Pole Y (abs) or pole Y referred to the last programmed position (inc)
Programming technological functions (cycles)
8.5 Further cycles and functions ShopMill
Unit
mm
mm
327