Siemens SINUMERIK 840D sl Operating Manual page 322

Programming technological functions (cycles)
8.1 Drilling
Z = center point of the cylinder
The "cylinder" in this case refers to any part that is clamped in the A/B axis.
Cylinder surface transformation
When working with the cylinder surface transformation, please note that the A axis or B axis
is not supported in all cases. Programming of any position in the XYA plane is not possible
while cylinder surface transformation is active.
Note
A work offset in the rotary axis A or B is effective even while cylinder surface transformation
is active.
Approach/retraction
1. Within a position pattern, or while approaching the next position pattern, the tool is
2. With technological follow-up operations (e.g. centering - drilling - tapping), the respective
Tool traverse path
● ShopMill
● G codes
322
retracted to the retraction plane and the new position or position pattern is then
approached at rapid traverse.
drilling cycle must programmed after calling the next tool (e.g. drill) and immediately
afterwards the call of the position pattern to be machined.
The programmed positions are machined with the previously programmed tool (e.g.
center drill). Machining of the positions always starts at the reference point. In the case of
a grid, machining is performed first in the direction of the 1st axis and then meandering
back and forth. The frame and hole circle are machined counterclockwise.
For G code, for lines/frames/grids, a start is always made at the next corner of the frame
or grid or the end of the row. The frame and hole circle are machined counterclockwise.
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
Milling