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

8.5.9

Predrilling contour pocket (CYCLE64)

Function
In addition to predrilling, the cycle can be used for centering. For this purpose, the centering
or predrilling program generated by the cycle is called.
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 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 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 stock 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. Solid machining
11. Contour pocket 2
12. Solid machining
If you are doing all the machining for the pocket at once, i.e. centering, predrilling and
removing stock directly one after the other, and do not set the additional parameters for
centering/predrilling, 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 again.
Turning
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Programming technology functions (cycles)
8.5 Contour milling
397