Siemens SINUMERIK 840D Operation/Programming Manual page 187

3
10.04
Contours for pockets or
islands
 Siemens AG, 2004. All rights reserved
SINUMERIK 840D/840Di/810D Operation/Programming ShopMill (BAS) – 10.04 Edition
Contours for pockets or islands must be closed, i.e. the start point and
end point of the contour are identical. You can also mill pockets that
contain one or more islands. The islands can also be located partially
outside the pocket or overlap each other. ShopMill interprets the first
contour specified as a pocket contour and all others as islands.
The machining of contour pockets with islands is generally
programmed as follows:
1. Enter contour for the pocket
You build up the contour pocket gradually from a series of different
contour elements.
2. Enter contour for the island
You enter the contour for the island after the contour for the
pocket.
3. Centering predrilling of the contour pocket
If you want to predrill the contour pocket, you can center the drill
hole first to prevent the drill slipping.
4. Predrill contour pocket
If you want the cutter to plunge into the material vertically and if a
milling cutter with an end tooth is not available, you can predrill the
pocket.
5. Remove stock from contour pocket with island (roughing)
The stock is removed from the contour pocket complete with island
taking into account various insertion strategies.
6. Remove residual material (roughing)
During stock removal from the pocket, ShopMill automatically
detects residual material that has been left. A suitable tool will
allow you to remove this without having to machine the complete
pocket again.
7. Finish contour pocket with island (finish edge/base)
If you programmed a finishing allowance for the edge/base when
you programmed roughing, the pocket edge/base will be machined
again.
Programming with ShopMill
3.5 Contour milling
3
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