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

Programming technology functions (cycles)
8.5 Contour milling
Name convention
For multi-channel systems, cycles attach a "_C" and a two-digit number of the specific
channel to the names of the programs to be generated, e.g. for channel 1 "_C01". This is the
reason that the name of the main program must not end with "_C" and a two-digit number.
This is monitored by the cycles.
For single-channel systems, cycles do not extend the name for the programs to be
generated.
Note
G code programs
For G code programs, the programs to be generated, which do not include any path data,
are saved in the directory in which the main program is located. In this case, it must be
ensured that programs, which already exist in the directory and which have the same name
as the programs to be generated, are overwritten.
8.5.9

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
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Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
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