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Cutting Tools 18 MoldMaking Technology —— AUGUST 2016 This illustration shows two possible stepover patterns for plunge milling, with the respective maximum stepover width of cut based on the insert land width. an issue. Also, an indexable drill typically only has one effec- tive cutting edge, as the inboard and outboard inserts are not cutting the same path. A mill of similar size will have more effective cutting edges, since all cutting edges are cutting the same path, and this can greatly increase the feed rate per min- ute, bringing the material removal rate (MRR) closer to that of a drill, even though less material is being removed per pass. In some cases, the MRR may even be greater. High-feed mills can work very well for plunging applica- tions, as the entry angle of the insert is usually 10 degrees or less. This places most of the forces axially towards the spindle for very high stability. The small entering angle also creates a very wide cutting land, so a relatively large stepover can be used, increasing productivity. Using high-feed mills for plunge roughing also works very well in profile roughing applications, such as along a wall without a lot of material or a very deep or tall part wall, which require a long length-to-diameter ratio for side milling. Plunging with indexable mills works best when cutting through to an open pocket or along a wall of a part with no floor. Since indexable mills do not cut all the way to center of the tool, it is critical to make sure that the steel body does not contact any material left on the floor of the component by Powerful 5-axis HSC/HPC machining centers combined with intelligent automated solutions manage even complex production processes. The optimum adaption to customer needs and application requirements guarantees additional productivity. Along with various automated solutions the Handtmann horizontal, profile, high moving portal and universal machining centers provide best value in unsurpassed application diversity. THE IDEAL PROCESS WITH HANDTMANN - MACHINING CENTERS AND AUTOMATION CONTACT US FOR MORE INFORMATION: Handtmann CNC Technologies, Inc. phone: 847-844-3300 email: info@handtmanncnc.com www.handtmanncnc.com