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"Program" operating area 01/2008
6.7 Free contour programming
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©Siemens AG 2008 All rights reserved.
6-302 SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition
6.7.6 Specifying contour elements in polar coordinates, closing the contour
Function
The description given above of defining the coordinates of contour
elements applies to the specification of positional data in the
Cartesian coordinate system. Alternatively, you have the option to
define positions using polar coordinates.
When programming contour definitions, you can define a pole at any
time prior to using polar coordinates for the first time. Programmed
polar coordinates subsequently refer to this pole. The pole is modal
and can be re-defined at any time. It is always entered in absolute
Cartesian coordinates. The contour calculator converts values entered
as polar coordinates into Cartesian coordinates. Programming in polar
coordinates is only available after entering a pole. The pole input
does not generate a code for the NC program.
Pole
The polar coordinates are valid in the level selected with G17 to G19.
The pole is a contour element that can be edited, which itself does not
contribute to the contour. It can be entered when the starting point of
the contour is defined or anywhere within the contour. The pole
cannot be created before the starting point of the contour.
Enter polar coordinates
More
Pole
Close
contour
Polar coordinates
The "More" softkey in the basic plane of the contour programming
accesses the "Pole" subscreen and the "Close contour" softkey.
The pole can only be entered in absolute Cartesian coordinates. The
"Pole" softkey is also present in the starting point screen. This enables
the pole to be entered at the start of a contour, so that the first contour
element can be entered in polar coordinates.
The contour is closed by a straight line between the last entered
contour point and the starting point.
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