Modern Machine Shop

JAN 2017

Modern Machine Shop is focused on all aspects of metalworking technology - Providing the new product technologies; process solutions; supplier listings; business management; networking; and event information that companies need to be competitive.

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mmsonline.com January 2017 MMS 83 FEATURE The machine features touch-trigger probing, which is primarily used to speed setups. For example, probing either side of a flute enables the rotor to be positioned properly in the C axis for milling a critical keyway. Plus, it is possible to park a fully opened large steady rest near the chuck as it is shown here rather than removing it from the machine to enable the milling spindle to access features on short shafts. Otherwise, removing and replacing a steady rest takes time, because it must be properly aligned with the chuck center line. a clearer view of the simulated cutting tool motion down the length of a part. The machine operators can also access Crash Guard from the machine's Siemens 840D control, which shows the motion of machine elements in real time, and prevents accidents from occurring on a new program's first run and initial setup of clamping devices. WHEN NOT TO MULTITASK Like most other companies that purchase a turn- mill such as the M-80, Siemens Norwood is able to machine many workpiece features in one clamping. That said, there is often so much flut- ing work to be done on that machine that the company will use one of its traditional CNC lathes to per form initial rough-turning operations for shaf ts, rather than tying up the M-80 for that basic work. After rough turning, those shafts are sent back to the turn-mill for fluting. Finish turn- ing might also be completed on the M-80, unless it makes more sense to send the rotor to another lathe for finish turning to enable the turn-mill to start another fluting job. On the other hand, when there's not so much f luting wor k sche dule d, the shop might r un simpler shaf t work that doesn't require fluting across the M-80 in order to get most if not all turning and milling work completed in one setup. T hat eliminate s work in proce ss ( WIP) when shaf ts require milling but the horizontal mill is tied up with other work. Bruce Tillinghast, Walker Machinery president, says Siemens Norwood actually considered adding this type of multitasking equipment platform some 20 years ago, but decided against it. At that time, all the necessary elements—software, hardware, tooling, training and so on—simply didn't jell into the type of repeatable process that's currently possible with today's turn-mill and related machin- ing technologies. The system also wouldn't have been as reliable, he says, which is important given not only the significant investment Siemens Nor- wood made in its turn-mill machine, but also because it is the only machine in its plant that can perform fluting work. Tools can be changed out of the ATC magazine with- out shutting down the machine while it is operating. Solid carbide drills combined with high-pressure cool- ant enables deep holes to be drilled without pecking.

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