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The Ecoca SJ-20 from Absolute Machine Tools is a high-precision CNC turning center designed for robust cutting performance and operational flexibility.
The center is cast from Meehanite with a rigid, 45-degree slant-bed design. Precision linear ways provide stiffness and high rapid feed rates while ensuring accuracy, the company says.
For precision and thermal stability, the headstock, tailstock and saddle are all mounted on the same plane at a 45-degree angle. The coolant tank is separate from the machine’s base to prevent heat transfer from the coolant to the machine casting. This promotes easy cleaning and maintenance, the company says.
The machine’s spindle structure is mounted using double-row roller bearings in conjunction with angular contact ball bearings for high rigidity and accuracy. The spindle quill inner and outer linings are precision ground and the spindle is driven by a 10-hp, dual-wound, high torque motor that provides power throughout the entire rpm range.
The machine features a swing-over bed of 19″ and a maximum turning diameter of 8.74″ (6.69″ with the live tool option). The distance between centers is 13″ and maximum turning diameter is 8.74″ (6.69″ with live tooling option).
A 12-station, bidirectional servo turret or optional VDI turret provides 0.2-second indexing as well as coolant through the toolholders. A C axis with live tools is available for applications requiring milling operations. The C axis’ 3-hp spindle turns at a rate of 4,000 rpm with 0.001-degree accuracy. The Fanuc OiT-C control is standard.
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.