Johnford LC series machines are large, heavy-duty, high-precision flat-bed CNC turning centers. Distance between centers range from 80″ (2,032 mm) to 788″ (20,015 mm) in 39.4″ (1000 mm) increments. Swing over the machine bed ranges from 40″ (1,016 mm) to 90″ (2,286 mm). Spindles are available in 50-133 hp, with a four-speed gearbox spindle drive. C-axis and Y-axis capabilities are optional. Standard are 12 vertical turret tools, with 4 or 6 horizontal, 8 vertical, or twin turrets optional.
The vertical 12-tool turret with a 12″ thick tool disk provides rapid indexing, as well as coolant through the tool holders. The turret has boring bar capacity of up to 6″.
The spindle structure is supported by precision double row cylindrical roller bearings and high speed double angular contact bearings. The machine bed is a one-piece floor to floor Meehanite casting and provides efficient free flow of chips and ease of operator accessibility. The bed has 3 ways, which provides the ability to turn through the steady rest. The center way on the bed is actually two ways in one and is shared by both the cross slide and the steady rests or other equipment mounted on the back ways. Due to the length of the machine, the Z-axis ballscrew is stationary and the ball nut rotates. This eliminates screw whip and vibration.
Standard equipment includes a comprehensive coolant system, 20″ (508 mm) 3-jaw hydraulic chuck, dual chain type chip conveyors, programmable tailstock with live quill, and safety guarding.
