Traveling-Column VMC Machines Five Sides Simultaneously

The Doosan VCF850LSR vertical machining center features a versatile traveling-column design with a tilting B-axis spindle head and a 500-mm (19.685") rotary table for machining multiple sides of a workpiece at once. The headstock is mounted to a rigid swiveling base driven by a heavy-duty, high-precision worm gear. The B axis is capable of 900 foot-pounds of torque during contour machining and can be locked down using a hydraulic piston with 1,475 foot-pounds of torque for heavy-duty cutting.

The spindle head can rotate 110 degrees on either side of vertical, enabling it to machine large and complex parts in a single setup. The 12,000-rpm built-in drive spindle motor features a CAT-40 Big Plus cartridge-type spindle system and offers 18.5/22 kW (25/29.5 hp) and 147.25 Nm (108.60 foot-pounds) of torque. A 20-bar (230-psi) through-spindle coolant system delivers coolant directly to the tool tip. 

The machining center’s bed is a rigid, one-piece casting of fine grain Meehanite cast iron with heavy ribbing. The roller linear motion guideways measure 45 × 45 × 45 mm (1.277" × 1.277" ×1.277") in the X, Y and Z axes. Each axis is driven by a precise double-nut ballscrew centered between the guideways and supported on both ends by angular contact thrust bearings. All axes have large-diameter ballscrews directly connected to oversized AC servodrive motors without gears or belts, avoiding backlash. Absolute-type linear glass scales in the X, Y and Z axes promote high positioning accuracy and enable tighter part tolerances with fewer offset changes.

The VMC is equipped with a 60-tool chain-type double-arm automatic toolchanger driven by a servomotor and offering tool-to-tool time of 1.5 sec. Additional features include a handheld manual pulse generation for fixture and part alignment; a program and data protection key switch; FANUC 31-iB series control equipped with a slot for a PCMCIA and USB port; and an operator panel that can swivel 180 degrees.