Turning Center for Heavy-Duty Applications

Absolute Machine Tools offers the Johnford ST-80 CH, a high-precision CNC turning center for the oilfield, energy and construction industries.

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Absolute Machine Tools offers the Johnford ST-80 CH, a high-precision CNC turning center for the oilfield, energy and construction industries. The 35,500-lb slant bed machine features bed lengths ranging to 240" and spindle holes as large as 24". The one-piece, 60-degree casting is designed to improve ergonomics and chip flow. The slant bed is a torque-tube design, which means a hole is cast through the center of the slant bed to provide rigidity and heat dissipation.
 
A 50-hp high-torque spindle motor and a standard four-speed gearbox deliver high torque at low rpms, and a 60-hp spindle motor is available for high-power cutting. The precision spindle structure is mounted with double-row roller bearings and angular contact ball bearings to increase rigidity and accuracy.
 
Hand-scraped square boxways provide rigidity for heavy-duty turning. Turcite B is applied to all mating sliding surfaces to ensure high rapid traverse rates and accurate positioning, the company says. The headstock, tailstock and saddle are mounted on the same plane at a 60-degree angle for precision and thermal stability. The coolant tank is separate from the machine base to prevent heat transfer from the coolant to the machine casting. The double-nut ballscrews are pre-tensioned to avoid thermal growth. A 12-station bi-directional turret or optional BMT live turret provides 0.5-sec. indexing as well as coolant through the toolholders. A full C axis with live tools is available for milling applications. FANUC CNC controls are standard.
 
Other features include a hydraulic 20" chuck with soft jaws, a chip conveyor and a hydraulic, programmable tailstock body and quill. An optional C axis with live tools is also available. The C axis accuracy is 0.001 degree.

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This machine can run for a long time without any operator intervention, and users can machine finished parts from slug stock or cast blanks while achieving the same high productivity as if they were machining from barstock, the company says.