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

8.4.4

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:
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.
Approach/retraction
1. The tool approaches the starting point at rapid traverse at the height of the retraction
2. The tool traverses the spigot contour sideways in a semicircle at the machining feedrate.
3. When the spigot has been circumnavigated once, the tool is removed from the contour in
4. The spigot is approached again in a semicircle and circumnavigated once. This process
5. The tool moves back to the safety distance at rapid traverse.
Machining type
● Roughing
● Finishing
● Chamfering
Turning
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
plane and adjusts to the safety distance. The starting point is on the positive X axis
rotated through α0.
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.
a semicircle; the infeed to the next machining depth is then executed.
is repeated until the programmed spigot depth is reached.
Roughing involves moving around the rectangular spigot until the programmed finishing
allowance has been reached.
If you have programmed a finishing allowance, the rectangular spigot is moved around
until depth Z1 is reached.
Chamfering involves edge breaking at the upper edge of the rectangular spigot.
Programming technology functions (cycles)
8.4 Milling
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