Programming technology functions (cycles)8.5 Contour millingTurningOperating Manual, 07/2010, 6FC5398-8CP40-0BA0 3978.5.9 Predrilling contour pocket (CYCLE64)FunctionIn addition to predrilling, the cycle can be used for centering. For this purpose, the centeringor predrilling program generated by the cycle is called.When removing stock from a contour pocket, if you want the cutter to plunge into thematerial vertically and if a milling cutter with an end tooth is not available, you must predrillthe 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 centerbefore predrilling, you have to program the two machining steps in separate blocks.The number and positions of the necessary predrilled holes depend on the specificcircumstances (such as shape of contour, tool, plane infeed, finishing allowance) and arecalculated by the cycle.If you mill several pockets and want to avoid unnecessary tool changeover, predrill all thepockets first and then remove the stock.In this case, for centering/predrilling, you also have to enter the parameters that appearwhen you press the "All parameters" softkey. These parameters must correspond to theparameters from the previous stock removal step. Then program as follows:1. Contour pocket 12. Centering3. Contour pocket 24. Centering5. Contour pocket 16. Predrilling7. Contour pocket 28. Predrilling9. Contour pocket 110.Solid machining11.Contour pocket 212.Solid machiningIf you are doing all the machining for the pocket at once, i.e. centering, predrilling andremoving stock directly one after the other, and do not set the additional parameters forcentering/predrilling, the cycle will take these parameter values from the stock removal(roughing) machining step. When programming in G code, these values must be specificallyre-entered again.
