Siemens SINUMERIK 840D sl Operating Manual page 509

● 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.
Cylinder surface transformation
For contours (e.g. slots) on cylinders, lengths are frequently specified in the form of angles. If
the "Cylinder surface transformation" function is activated, you can also define on a cylinder
the length of contours (in the circumferential direction of the cylinder surface) using angles.
This means instead of X, Y and I, J, you enter Xα, Yα and Iα, Jα.
Parameter input
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.
Turning
Operating Manual, 05/2017, A5E40868721
Machine manufacturer
Please refer to the machine manufacturer's specifications.
Programming technology functions (cycles)
10.5 Contour milling
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