Creating Contour Elements - Siemens SINUMERIK 840D sl Turning Operating Manual

Programming technology functions (cycles)
10.5 Contour milling
parameters
Starting point
L1
ϕ1
Additional commands
10.5.4

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.
568
Description
Distance to pole, end point (abs)
Polar angle to the pole, end point (abs)
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 tran‐
sitions 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 Y-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 path milling!
Operating Manual, 06/2019, A5E44903486B AB
Unit
mm
Degrees
Turning