Bridgeport Series 1 Knee Mill, 2J Head, 9" x 42" Table, 2 HP, R-8 Taper, x-Axis Power Feed

The Bridgeport Series 1 knee mill features a 2J head with a variable speed range of 500 to 4200 RPM in high and 60 to 500 RPM in low at 60 Hz. The spindle is an R-8 taper with a 1.875-inch diameter and a 3.375-inch quill diameter. It offers three power quill feeds of 0.0015, 0.003, and 0.006 inches per revolution, providing a drilling capacity of 3/8 inch and a boring range of 6 inches in mild steel. The machine is equipped with a 9 x 42-inch table featuring three 0.625-inch T-slots on 2.5-inch centers. Travel specifications include 31 inches on the X-axis, 12 inches on the Y-axis, 5 inches of quill travel, 16 inches on the Z-axis (knee), and 12 inches of ram travel. Throat distance ranges from 6.75 to 18.75 inches, while the distance from the table to the spindle nose gage line is between 2.5 and 18.25 inches. The mill supports a maximum workpiece weight of 750 lbs. Power requirements are 208/230/460 volts, 3-phase, 50/60 cycle, with a 4KVA capacity. The motor provides a 3 HP rating for a 30-minute duty cycle and 2 HP for continuous operation. Physical dimensions include a floor area of 8.3 x 7.8 feet and a height of 87 inches, with a net weight of 1930 lbs. Features include chrome ways, an X-axis power feed, and a Bijur one-shot lubrication system.