Siemens SINUMERIK 808D Milling Programming And Operating Manual page 73

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.
Radius or chamfer at the start or the end of a turning contour:
In simple turning contours a chamfer or radius must often be appended at the start and end
of the contour.
A chamfer or radius terminates an axis-parallel contour section on the blank:
Figure 4-3
You select the direction of transition for the contour start in the starting point screen. You can
choose between chamfer and radius. The value is defined in the same manner as for the
transition elements.
In addition, four directions can be selected in a single selection field. You select the direction
of the transition element for the contour end in the end screen. This selection is always
proposed, even if preceding elements were assigned no transition.
Contour chain
Once you complete or cancel the programming of a contour element, you can navigate
around the contour chain (left on the main screen) using the cursor keys. The current
position in the chain is color-highlighted.
The elements of the contour and pole, if applicable, are displayed in the sequence in which
they were programmed.
You can select an existing contour element with the following key and reassign its
parameters:
Milling Part 1: Operation
Programming and Operating Manual, 12/2012, 6FC5398-4DP10-0BA0
Contour with radius or chamfer
Part programming
4.5 Free contour programming
73