Creating Contour Elements - Siemens SINUMERIK 840D sl Operating Manual

Parameter Description
Additional You can enter additional commands in the form of G code for each contour element.
commands You can enter the additional commands (max. 40 characters) in the extended
parameter screens ("All parameters" softkey). The softkey is always available at the
starting point, it only has to be pressed when entering additional contour elements.
You can program feedrates and M commands, for example, using additional G code
commands. However, carefully ensure that the additional commands do not collide with
the generated G code of the contour and are compatible with the machining type
required. Therefore, do not use any G code commands of group 1 (G0, G1, G2, G3), no
coordinates in the plane and no G code commands that have to be programmed in a
separate block.
The contour is finished in continuous-path mode (G64). As a result, contour transitions
such as corners, chamfers or radii may not be machined precisely.
If you wish to avoid this, then it is possible to use additional commands when
programming.
Example: For a contour, first program the straight X parallel and then enter "G9" (non-
modal exact stop) for the additional command parameter. Then program the Z-parallel
straight line. The corner will be machined exactly, as the feedrate at the end of the X-
parallel straight line is briefly zero.
Note:
The additional commands are only effective for finishing!
8.5.4

Creating contour elements

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
For each contour element, you must parameterize a separate parameter screen. Parameter
entry is supported by various help screens that explain the parameters.
If you leave certain fields blank, the cycle 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 entering less parameters and allowing the cycle to calculate as
many parameters as possible.
Milling
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
Programming technological functions (cycles)
8.5 Contour turning- only for G code programs
Unit
447