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

ShopTurn Functions
5
5.6 Contour milling

5.6.6 Predrilling a contour pocket

5-288
When removing stock from a 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 must predrill the pocket first. To prevent the
drill slipping during drilling, you can center it first.
Before you drill the pocket, you must enter the pocket contour. If you
want to center before predrilling, you have to program the two
machining steps in separate blocks.
The number and positions of the necessary predrilled holes depend
on the specific circumstances (such as shape of contour, tool, plane
infeed, finishing allowance) and are calculated by ShopTurn.
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.
These parameters must correspond to the parameters from the
previous removal step. 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
If you machine a pocket completely, i.e. center, predrill and remove
stock in immediate succession, and do not complete the additional
parameters on centering/predrilling, ShopTurn loads these parameter
values from the stock removal (roughing) machining step.
SINUMERIK 840D sl Operation/Programming ShopTurn (BAT) – 08/2005 Edition
08/2005
5
♥ Siemens AG, 2005. All rights reserved