Rectangular Spigot (Cycle76) - Siemens SINUMERIK 840D sl Operating Manual

Programming technological functions (cycles)
8.2 Milling
8.2.4

Rectangular spigot (CYCLE76)

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:
Depending on the dimensions of the rectangular spigot in the workpiece drawing, you can
select a corresponding reference point for the rectangular spigot.
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 rectangular spigot is machined using only one infeed. If you want to machine the spigot
using multiple infeeds, you must program the "Rectangular spigot" cycle several times with a
reducing finishing allowance.
Sequence
1. The tool approaches the starting point at rapid traverse at the height of the retraction
2. The tool approaches the spigot contour sideways in a semicircle at machining feedrate.
3. When the rectangular spigot has been traversed once, the tool retracts from the contour
4. The rectangular spigot is approached again in a semicircle and traversed once. This
5. The tool moves back to the safety clearance at rapid traverse.
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plane and is fed in to the safety clearance. The starting point is on the positive X axis
rotated through α0.
The tool first executes infeed at machining depth and then moves in the plane. The
rectangular spigot is machined depending on the programmed machining direction (up-
cut/down-cut) in a clockwise or counterclockwise direction.
in a semicircle and then infeed to the next machining depth is performed.
process is repeated until the programmed spigot depth is reached.
Operating Manual, 09/2011, 6FC5398-7CP40-2BA0
Milling