Two Spindles Achieve Twice The Productivity

The Johnford HT-30-2SD CNC turning center is suited for industries that need the productivity afforded by a two-spindle turning center, the company says. The machine possesses a 30-hp, high-torque, double-wound main spindle as well as a 15-hp, double-wound sub-spindle. The turning center is cast from Meehanite iron. Built in the classic style, the 45-degree slant bed is a torque tube design. The torque tube, or hole cast through the center of the slant bed, provides a rigid bed and heat dissipation.

According to the company, square box ways provide the rigidity for heavy-duty turning.  Hand scraped Turcite-B is applied to all mating sliding surfaces, and 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 base to prevent heat transfer from the coolant to the machine casting. The ballscrews are double nut type and pre-tensioned to eliminate thermal growth. The spindle incorporates double-row roller bearings in conjunction with angular contact ball bearings for high rigidity and accuracy, the company says. The spindle quill inner and outer linings are precision ground for fit with the spindle.

A full C axis with live tools is optional for milling operations. The live tooling is backed by a 10-hp spindle motor that delivers a maximum of 3,276 rpm. C-axis accuracy is to 0.001-degree. The sub-spindle can also be equipped with an optional C axis with live tools. An optional Y axis provides vertical turret movement for complex off-center milling functions. Twin, 12-station, bi-directional servo turrets or optional VDI turrets provides 0.3-second indexing as well as coolant through the tool holders. Fanuc CNC controls are standard. Other standard features include a complete coolant system, a chip conveyor, a hydraulic 10" main chuck and an 8" rear chuck.