Siemens SINUMERIK 840D sl Operating Manual page 448

Programming technology functions (cycles)
10.4 Milling
Function
You can mill various rectangular spigots with the "Rectangular spigot" cycle.
You can select from the following shapes with or without a corner radius:
In addition to the required rectangular spigot, you must also define a blank spigot, i.e. the outer
limits of the material. The tool moves at rapid traverse outside this area. The blank spigot must
not overlap adjacent blank spigots and is automatically placed by the cycle in a central position
on the finished spigot.
The spigot is machined using only one infeed. If you want to machine the spigot using multiple
infeeds, you must program the "Rectangular spigot" function several times, with a continually
decreasing finishing allowance.
Clamping the spindle
For ShopTurn, the "Clamp spindle" function can be set up by the machine manufacturer.
Approach/retraction
1. The tool approaches the starting point at rapid traverse at the height of the retraction plane
and adjusts to the safety distance. The starting point is on the positive X axis rotated through
α0.
2. The tool traverses the spigot contour sideways in a semicircle at the machining feedrate.
The tool first executes the infeed at machining depth, followed by the movement in the
plane. Depending on the machining direction that has been programmed (up-cut/
synchronism), the spigot is machined in a clockwise or counterclockwise direction.
3. When the spigot has been circumnavigated once, the tool is removed from the contour in
a semicircle; the infeed to the next machining depth is then executed.
4. The spigot is approached again in a semicircle and circumnavigated once. This process is
repeated until the programmed spigot depth is reached.
5. The tool moves back to the safety distance at rapid traverse.
448
Machine manufacturer
Please refer to the machine manufacturer's specifications.
Operating Manual, 05/2017, A5E40868721
Turning