etary heat-treating of the inside and outside of the spindle, dovetail construction of the guiding system and application of scraping techniques reduce vibration, improve precision and reduce wear," said Walker. “The nature of Swiss-style machines requires a durable and true spindle. Because the integrated spindle is hollow, Nomura uses SCM415 chrome molyb- denum steel. When precisely machined, the outside of the spindle is heat-treated for durability, while the inside is condi- tioned to a different degree of hardness. A fully integrated spindle without belt drive and a sliding headstock that em- ploys a linear guide with preloaded roller pads, enables the headstock to move smoothly and accurately on a thin film of oil, minimizing vibration,” said Walker.
Converting Swiss to Non-Swiss is Easy Index Corp. (Noblesville, IN) offers
Traub TNL series machines in both sliding-headstock and fixed-headstock automatic lathe versions, with and without guide bushings. The Traub TNL18-7B, which features a vertical bed design, has seven linear axes and an extra B axis. With the additional B axis in the upper tool carrier, which can pivot 100°, highly complex parts and complicated contour elements that also require additional operations such as milling, drilling, lateral drilling or threading can be machined at any angular position.
“The Swiss machine is the optimum for machining parts with a huge length- diameter-ratio. Besides this advantage, the Swiss machining has some disad- vantages. One disadvantage of a Swiss machine is that you have to adjust the guide bushing with the right surface pressure from the bush to the bar," said Hans Koschig, Index Corp. (Noblesville, IN). “When I say the right pressure, I
See us at EASTEC Booth #5344 May 2013 |
ManufacturingEngineeringMedia.com 57
mean the pressure from the guide bushing to the bar, which has to be adjusted properly for consistent machining perfor- mance. In the past, sliding headstock or Swiss machines were used for small precision parts, irrespective of the length-diam-
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