Siemens SINUMERIK 840D sl Turning Operating Manual page 525

Longitudinal slot with the width of the tool
When milling a longitudinal slot, which is located in parallel with the spindle axis, and which
should be machined with the width of the tool, then the clamping remains active after insertion
in order to achieve more accurate results.
The cycles identify this special case and do not cancel clamping after insertion if the following
secondary conditions are fulfilled.
After machining, the clamping in the cycles is canceled again.
General conditions
● Finishing longitudinal slot with width = tool diameter
● Roughing longitudinal slot with (width - 2 * finishing allowance) = tool diameter
Input simple
For simple machining operations, you have the option to reduce the wide variety of parameters
to the most important parameters using the "Input" selection field. In this "Input simple" mode,
the hidden parameters are allocated a fixed value that cannot be adjusted.
If the workpiece programming requires it, you can display and change all of the parameters
using "Input complete".
Approach/retraction
1. The tool approaches the center point of the slot at rapid traverse at the height of the
retraction plane and adjusts to the safety distance.
2. The tool is inserted into the material according to the method selected.
3. The longitudinal slot is always machined from inside out using the selected machining
method.
4. The tool moves back to the safety distance at rapid traverse.
Machining type
You can select any of the following machining types for milling the longitudinal slot:
● Roughing
Roughing involves machining the individual planes of the slot one after the other from the
inside out, until depth Z1 or X1 is reached.
● Finishing
During finishing, the edge is always machined first. The slot edge is approached on the
quadrant that joins the corner radius. During the last infeed, the base is finished from the
center out.
Turning
Operating Manual, 06/2019, A5E44903486B AB
Machine manufacturer
Various defined values can be pre-assigned using setting data.
Please refer to the machine manufacturer's specifications.
Programming technology functions (cycles)
10.4 Milling
525