Lathe Features High Feed Rate For Heavy Cutting

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Available from Fortune International, the Vturn-40 is an 80+" (2-m) lathe with a gearbox and a high feed rate for heavy cutting. With an A2-11 spindle nose, a 50-hp Fanuc a30i spindle motor and a maximum feed rate of 787 ipm, the lathe is designed to overcome the technical limitations of its predecessor, the Vturn-36. The machine can turn parts as long as 86.6", and its Kitagawa hydraulic chuck accommodates barstock as large as 3.58" (91 mm) in diameter. Featuring a 45-degree, single-block slant bed designed for rigidity, the machine features box slideways with hardness of 55 HRC. It also includes a two-step gearbox to enhance cutting torque at low rpm. The Z axis is equipped with 1.97" (50-mm) diameter ballscrews and a high-volume coolant flush to reduce chip build-up inside the machine.

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Sew-Eurodrive Inc. worked with Okuma America’s authorized systems dealer, Gosiger Automation, to design an automated cell that includes an automatic, magazine bar feeder that loads 6-ft. lengths of barstock into the machine. The shop also switched to an Okuma twin spindle, twin turret turning center so all of the machining operations are completed in one setup, thus eliminating additional fixtures and operator intervention. The resultant system reduces cycle times and requires much less operator involvement. As a result, production time per part was more than cut in half – from about 5 minutes to 2 minutes, 20 seconds.