Predrilling Contour Pocket (Cycle64) - Siemens SINUMERIK 840D Operating Manual

Programming technological functions (cycles)
8.3 Contour milling
8.3.9

Predrilling contour pocket (CYCLE64)

Function
In addition to predrilling, the cycle can be used for centering. The centering or predrilling
program generated by the cycle is called for this purpose.
If a milling cutter cannot be inserted at the center to remove stock from contour pockets, then
it is necessary to predrill first. The number and positions of the required predrilled holes
depends on the specific conditions, e.g. type of contour, tool, plane infeed, finishing
allowances.
If you mill several pockets and want to avoid unnecessary tool changes, 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 stock removal step.
Programming
When programming, proceed 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. Stock removal
11. Contour pocket 2
12. Stock removal
If you are doing all the machining for the pocket at once, i.e. centering, rough-drilling and
removing stock directly in sequence, and do not set the additional parameters for
centering/rough-drilling, the cycle will take these parameter values from the stock removal
(roughing) machining step. When programming in G code, these values must be specifically
re-entered.
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Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Milling