Siemens SINUMERIK 840D sl Operation/Programming Manual page 244

ShopTurn Functions
5
5.5 Milling
Approach/retraction
Machining type
5-244
1. The tool approaches the starting point at rapid traverse at the
height of the retraction plane and adjusts to the safety clearance.
The starting point is on the positive X axis rotated through α0.
2. The tool traverses the spigot contour sideways in a semicircle at
machining feed. The tool first executes infeed at machining depth
and then moves in the plane. The spigot is machined as a function
of the programmed machining direction (climb/conventional) in a
clockwise or counterclockwise direction.
3. When the spigot has been circumnavigated once, the tool retracts
from the contour in the plane in a semicircle and then infeeds to
the next machining depth.
4. The spigot is approached again in a semicircle and
circumnavigated once. The process is repeated until the
programmed spigot depth has been reached.
5. The tool moves back to the safety clearance at rapid traverse.
X
Retracting
contour
Y
Approaching and retracting from the rectangular spigot in a semicircle
You can select the machining mode for milling the rectangular spigot
as follows:

Roughing
Roughing involves moving round the spigot until the programmed
finishing allowance has been reached.

Finishing
If you have programmed a finishing allowance, the spigot is moved
round until depth Z1 is reached.

Chamfer
Chamfering involves edge breaking at the upper edge of the
rectangular spigot.
SINUMERIK 840D sl Operation/Programming ShopTurn (BAT) – 08/2005 Edition
Tool
Approaching
contour
Rectangular
spigot
♥ Siemens AG, 2005. All rights reserved
08/2005
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