Predrilling A Contour Pocket - Siemens SINUMERIK 840D Operation/Programming Manual

3
Programming with ShopMill
3.5 Contour milling

3.5.7 Predrilling a contour pocket

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If a milling tool cannot be inserted in the center to remove stock from
contour pockets, it is necessary to rough-drill first.
The number and positions of the required rough drill holes depends
on certain conditions, e.g. type of contour, tool, plane infeed, finishing
allowances.
The rough-drilling cycle comprises a centering cycle and the actual
rough-drilling cycle.
The drilling positions in the contour pocket cycle are determined when
the contour pocket is calculated. This calculation generates a special
drilling program that is called in the rough drilling cycles (centering
and rough drilling).
Contour pocket
Contour island
Rough drilling/centering contour pocket
Rough drilling/rough drilling contour pocket
Solid machining, roughing
Residual material
Solid machining, finishing plane
Solid machining, finishing depth
Example of a chain containing rough drilling (centering and rough drilling) and solid
machining
If you mill several pockets and want to avoid unnecessary tool
changeover, predrill all the pockets first and then remove the stock. In
this case, for centering/predrilling, you also have to enter the
parameters that appear when you press the "All parameters" softkey.
Then program as follows:
1. Contour pocket 1
2. Centering
3. Contour pocket 2
4. Centering
5. Contour pocket 1
6. Predrilling
7. Contour pocket 2
8. Predrilling
9. Contour pocket 1
10. Remove stock
11. Contour pocket 2
12. Remove stock
SINUMERIK 840D/840Di/810D Operation/Programming ShopMill (BAS) – 10.04 Edition
3
10.04
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