Modern Machine Shop

JAN 2018

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Modern Machine Shop 85 Five-Axis Turning this unit can double as a presetter for tools with unknown lengths and radii. As for the tools themselves, Mr. Schnitzer rec- ommends cutters with multiple insert positions to consolidate inventory and maximize toolchanger capacity. Rather than using a new tool, he explains, the same tool can be adjusted to present a new insert to the work. Although a five-axis machining center must be configured differently for turning, there's a common thread to these design adaptations. Most ensure rigidity and operator safety in some way, building on the advantages already provided by the company's standard platform. The fact that this platform was originally developed for milling demonstrates the importance of rigidity for all machining operations, not to mention the extent to which conventional thinking about milling versus turning has broken down. The C 62 U MT Dynamic is the largest of the company's mill-turn (MT) line of machines. It covers parts ranging to 1,200 mm in diameter and 900 mm in height. datums, he says, citing tool center-point control (TCP) as one example. CNCs also have particular, turning-oriented settings for acceleration, decel- eration and other essential parameters. Users can fine-tune these settings to emphasize speed or metal removal. MT models also feature the HSK-T spindle inter- face, which is designed specifically for stationary cutting tools. Although fully compatible with the HSK-A63 and larger HSK-A100 designs that are standard with Hermle machines, HSK-T provides a tighter fit between spindle key and toolholder keyway. This ensures that the insert approaches the work at the proper angle. Locking tool assem- blies securely in place for turning is accomplished via a Hirth coupling for larger machines or a hydraulic sleeve for smaller machines. Tool measurement is also a concern because turning cutters cannot be checked for wear or breakage by being spun inside a laser beam. That is why the Blum laser tool probes that come stan- dard with MT machines are fitted with a static touch-off probe, Mr. Schnitzer says. He adds that | Hermle Machine Co. 414-421-9770 |

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