Circular Spigot (Cycle77) - Siemens sinumerik 840D sl Operating Manual

Programming technology functions (cycles)
8.4 Milling
8.4.5

Circular spigot (CYCLE77)

Function
You can mill various circular spigots with the "Circular spigot" function.
In addition to the required circular 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 on the finished spigot in
a centered position.
The circular spigot is machined using only one infeed. If you want to machine the spigot
using multiple infeeds, you must program the "Circular spigot" function several times with a
reducing finishing allowance.
Approach/retraction
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 circular spigot has been traversed once, the tool retracts from the contour in a
4. The circular spigot is approached again in a semicircle and traversed once. This process
5. The tool moves back to the safety clearance at rapid traverse.
Machining type
You can select the machining mode for milling the circular spigot as follows:
● Roughing
● Finishing
● Chamfering
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plane and is fed in to the safety clearance. The starting point is always on the positive X
axis.
The tool first executes infeed at machining depth and then moves in the plane. The
circular spigot is machined depending on the programmed machining direction (up-
cut/down-cut) in a clockwise or counterclockwise direction.
semicircle and then infeed to the next machining depth is performed.
is repeated until the programmed spigot depth is reached.
Roughing involves moving round the circular spigot until the programmed finishing
allowance has been reached.
If you have programmed a finishing allowance, the circular spigot is moved around until
depth Z1 is reached.
Chamfering involves edge breaking at the upper edge of the circular spigot.
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Turning