CNC Flat Bed Lathe for Large Workpieces

Available from YMT, L&L Machinery Industry’s LL-series ultra-rigid CNC flat-bed lathe is designed for extra long and large workpieces.

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Available from YMT, L&L Machinery Industry’s LL-series ultra-rigid CNC flat-bed lathe is designed for extra long and large workpieces that require heavy turning, threading and boring operations, such as those required by the aerospace, utilities, oil and gas, marine, and heavy equipment industries. The lathe features five hardened and ground boxways and can accommodate workpieces weighing as much as 11 tons. The large work envelope provides a 37.4" maximum cutting diameter and 394" between centers.

The lathe is equipped with a 16" spindle bore and 50-hp spindle motor featuring four-step automatic transmission for improved power and torque. The 12-station heavy-duty turret and oversized tailstock provide versatility. A boring attachment mounted on the sub-carriage makes it well-suited for difficult boring requirements.

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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.