Creating Contour Elements - Siemens SINUMERIK 840D Operating Manual

Programming technological functions (cycles)
8.3 Contour milling
8.3.4

Creating contour elements

After you have created a new contour and specified the starting point, you can define the
individual elements that make up the contour.
The following contour elements are available for the definition of a contour:
● Straight vertical line
● Straight horizontal line
● Diagonal line
● Circle/arc
● Pole
For each contour element, you must parameterize a separate parameter screen.
The coordinates for a horizontal or vertical line are entered in Cartesian format; however, for
the contour elements Diagonal line and Circle/arc you can choose between Cartesian and
polar coordinates. If you wish to enter polar coordinates you must first define a pole. If you
have already defined a pole for the starting point, you can also refer the polar coordinates to
this pole. Therefore, in this case, you do not have to define an additional pole.
Parameter entry is supported by various help screens that explain the parameters.
If you leave certain fields blank, the geometry processor assumes that the values are
unknown and attempts to calculate them from other parameters.
Conflicts may result if you enter more parameters than are absolutely necessary for a
contour. In such a case, try to enter fewer parameters and allow the geometry processor to
calculate as many parameters as possible.
Contour transition elements
As a transition between two contour elements, you can choose a radius or a chamfer. The
transition element is always attached at the end of a contour element. The contour transition
element is selected in the parameter screen of the respective contour element.
You can use a contour transition element whenever there is an intersection between two
successive elements which can be calculated from the input values. Otherwise you must use
the straight/circle contour elements.
The contour end is an exception. Although there is no intersection to another element, you
can still define a radius or a chamfer as a transition element for the blank.
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Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Milling