1991 BRIDGEPORT VMC720 VERTICAL MACHINING CENTERS

Technical Description

The 1991 Bridgeport VMC720 is a 3-axis vertical machining center produced by Bridgeport Machines at its UK facility, sharing the same specifications as the 1990 Interact 720 production with minor refinements. The machine features a 36.4-inch by 15.0-inch worktable with a 20-tool automatic tool changer and an ISO 40 spindle taper. The spindle motor delivers approximately 10 HP (7.5 kW) with a maximum speed of 4,000 RPM. X-axis travel is 29.9 inches (760mm), Y-axis travel is 15.7 inches (400mm), and Z-axis travel is 17.7 inches (450mm). The machine is equipped with Bridgeport's proprietary Interact CNC control. Machine construction features a robust cast-iron base, column, and saddle with precision-ground ballscrews and recirculating-ball guideways throughout. The table load capacity is approximately 925 lbs. Standard equipment includes flood coolant and automatic lubrication. Overall machine dimensions are approximately 126 inches long by 102 inches wide by 98 inches tall, with a machine weight of approximately 7,716 lbs. The 1991 VMC720 is mechanically identical to the 1990 production and was sold in the European and North American markets as a capable mid-size VMC for job shop and production environments. Some units from this production year were later retrofitted with Fanuc 0M or Series 0 controls to extend their service life as the proprietary Interact control became more difficult to support. Buyers should verify control system status and servo drive condition when evaluating machines from this era.