Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual page 224

Parameters for programming circular arcs
①
Direction of rotation of the circular arc: clockwise or counter-clockwise
②
Radius of circle
③
Absolute (abs)/incremental (inc) end positions in X and Z directions
④
Absolute (abs)/incremental (inc) positions of circle center point in X (I) and Z (K) directions
⑤
The contour chain which displays the start point and programmed contour elements. The current position in the chain
is color-highlighted.
⑥
The graphics window which displays the progress of the contour as you configure the parameters for the contour ele-
ments.
The following additional parameters are displayed after you press this softkey:
Parameter Description
α1 Starting angle with reference to X axis
α2 Angle to preceding element; tangential transition: α2=0
β1 End angle with reference to X axis
β2 Angle of aperture of circle
Machine manufacturer
The names of the identifiers (X or Z ...) are defined in the machine data where they can also be changed.
Transition to next element
A transition element can be used whenever there is a point of intersection between two neighboring elements; this can be
calculated from the input values.
You can choose to insert either a radius (RND), a chamfer (CHR) or an undercut as the transition element between any two
contour elements. The transition is always appended to the end of a contour element. You select transition elements in the
parameter input screen for the relevant contour element.
You can access the undercut transition element (see Section "Undercuts for turning technology (Page 226)") with the
following softkey:
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Programming and Operating Manual (Turning)
6FC5398-5DP10-0BA2, 06/2015