Predrilling Contour Pocket (Cycle64) - Siemens SINUMERIK 828D Operating Manual

Programming technology functions (cycles)
9.5 Contour milling
9.5.9

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.
To prevent the drill slipping during drilling, you can center it first.
Before you predrill 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 the cycle.
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. 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, 01/2015, 6FC5398-8CP40-5BA2
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