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Developed for high-production turning, the 42-mm TNK42 fixed-headstock automatic lathe from Traub, a subsidiary of Index Corp., produces complex workpieces in large and medium volumes ranging to 250-mm long.
The vertical design of the machine has a setup-friendly work area which permits unobstructed chip flow and better operation ergonomics, the company says. The vertical machine bed is mounted on a cast iron base, which provides suitable damping properties for high-precision cutting.
With two tool turrets, the automatic lathe features a 29-kW, 65-Nm, 7,000-rpm main spindle with a C axis and 42-mm bar capacity, and a swivel counter spindle with a C axis for extensive rear-end machining. According to the company, the machine is capable of high production rates in a 5.5 m² footprint (without bar loader).
The vertical design permits unobstructed chip flow and better ergonomics for setup operations. The stable, vertical cast machine bed is mounted on a cast iron base to provide effective damping properties for high-precision cutting.
The upper tool turret has 10 stations with slide travels measuring 140 × 300 mm in the X and Z axes, respectively. All stations in the upper turret can be equipped with live tool holders. Turret indexing is accomplished via an NC rotary axis with a direct measuring system to avoid the need for a mechanical lock and enable fast turret positioning at any angle, the company says. Multiple tools can be assigned to each station, and the upper tool carrier can be equipped with as many as 20 tools.
Editor PickRobotic Cell Cuts Cycle Time, Improves Part Quality
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.