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Designed for machining diffi cult-to-machine parts and materials, the ZPS Swiss CNC 32 has the rigidity to do gear hobbing, an application that isn’t normally associated with the Swiss-machining capability.


position means the tip of the tool will move and be brought into the right position,” said Koschig. Traub TNL series CNC automatic lathes can be used as sliding headstock and fi xed headstock versions. You can run each machine with and without guide bushings. Gear Hobbing Demonstrates Machine’s Rigidity “The ZPS Swiss CNC 32 machine is designed to push the envelope of performance for high-end Swiss applica- tions like machining diffi cult-to-machine parts and material for the medical, aerospace, and automotive sectors where other Swiss machines aren’t likely to be competitive,” said Olaf Tessarzyk, managing partner, ZPS America (Indianapolis, IN). One application that isn’t normally associated with Swiss machining is the ability to do gear hobbing, which the ZPS Swiss machine’s rigidity allows it to do. The solidly built machine’s cast iron base weighs in at 11,000 lb (4989 kg). It has the ability to put up to four tools in the cut simultaneously and has 12 axes with 23 tool positions. Gang tool slides on the front of the machine allow pinch milling, pinch turning, which are time savers. They allow the machine to rough and fi nish while the part is pushed through the guide bushing. “At the same time, end working attachments from the front, driven or static, can work off-center and have three tools in the cut while working independently with the subspindle doing the backworking


machining. Front and back sides of the part can be worked independently with a subspindle that has the same power as the main spindle,” said Tessarzyk. ZPS America has its own software. “It’s not a post, and


that’s important because on a post you have to go back and forth and never are able to emulate the machine program 100%. What we did was get a European manufacturer of a CAM post to build it into our machine control. As a result we can use our software on the computer as an exact machine replica and go back and forth without losing any data, like clearances, safety positions, tool crash avoidance and the like,” said Tessarzyk.


ZPS’ design for the Swiss 32 employs several features,


specifi cally aimed at heavy-duty milling. ZPS uses a spindle disk brake for heavy mill cutting rather than using only a C- axis clamp that wouldn’t be likely to hold up under heavy C- axis milling. Also a programmable guide bushing isn’t slotted on the inside, it’s slotted only on the outside to prevent debris from contaminating the guide bushing. “The pneumatically actuated guide bushing is virtually maintenance free. Again, if you do heavy milling, you want to lock your spindle in posi- tion and lock the guide bushing so you can use it as a fi xed headstock. The other advantage is that in the open position you can advance material and run standard stock that isn’t ground,” said Tessarzyk.


37 — Medical Manufacturing 2015


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