Straight Polar - Siemens SINUMERIK 840D sl Operation/Programming Manual

ShopTurn Functions
5
5.1 Straight or circular path movements

5.1.6 Straight polar

Radius compensation
5-164
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. The angle is based on another axis depending on the
machining plane. 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 further
lines or circles with incremental coordinates.
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 occurs when radius
compensation is deactivated.
Programmed
path
Travel path
First straight line with radius compensation First straight line with deactivated radius
SINUMERIK 840D sl Operation/Programming ShopTurn (BAT) – 08/2005 Edition
08/2005
Turning Face
Z X
X Y
Programmed
Travel path
compensation
♥ Siemens AG, 2005. All rights reserved
5
Overall
Y
Z
path