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Johnford’s Super Lathe (SL) series is comprised of small- to medium-sized machines with chuck sizes ranging from 6" to 21" and bed lengths as large as 100". Standard features include a chip conveyor, programmable hydraulic tailstock, a minimum of 12 tool turrets and a Fanuc or Siemens CNC control system.
The 45-degree machine beds are constructed from Meehanite cast iron. All of the guideways are box ways with Turcite B. To optimize rigidity and accuracy, the spindle is mounted on double-row roller bearings, along with angular contact ball bearings. The quill inner and outer lining is precision-ground to fit the spindle, thus promoting concentricity.
Optional C-axis and Y-axis functions are available. The turning centers may be used in conjunction with the SL-300 bar feeder. Weighing 8,800 lbs, the bar feeder features 40-mm pretensioned ballscrews; 15.7" swing over bed; 13" swing over carriage; and three spindle options.
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.