Straight Line Polar - Siemens SINUMERIK 828D Operating Manual

Computerized numerical controller for machine tools

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Programming technology functions (cycles)

9.7 Additional cycles and functions in ShopTurn

Straight line polar

When you want to program a straight line in polar coordinates, you can use the "Straight

Polar" function.

A straight line in the polar coordinate system is defined by the length L and the angle α.

Depending on the selected machining plane, the angle refers to another axis. The direction

in which a positive angle points also depends on the machining plane.

Machining plane

Reference axis for angle

Positive angle in direction of the axis

The tool traverses a straight line from its current position to the programmed end point at the

machining feedrate or at rapid traverse.

The 1st line in polar coordinates entered after the pole must be programmed in absolute

dimensions. You can program any additional lines or arcs also in incremental dimensions.

Radius compensation

Alternately, you can implement the straight line with radius compensation. The radius

compensation acts modally, therefore you must deactivate the radius compensation again

when you want to traverse without radius compensation. Where several straight line blocks

with radius compensation are programmed sequentially, you may select radius

compensation only in the first program block.

For the first straight line with radius compensation, the tool approaches the starting point

without radius compensation and the end point with radius compensation, i.e. if a vertical

path is programmed, a slope will be traversed. The compensation does not act over the

entire traverse path until the second programmed straight line with radius compensation. The

reverse effect occurs when radius compensation is deactivated.

Straight line with selected radius compensa-

If you want to prevent deviation from the programmed path, you can program the first

straight line with radius compensation or with deactivated radius compensation outside the

workpiece. Programming without coordinate data is not possible.

Straight line with deselected radius compen-

Operating Manual, 01/2015, 6FC5398-8CP40-5BA2

Sinumerik 840d sl