Hyundai WIA L5100LY

The Hyundai WIA L5100LY is a large turning center with a Y axis: a 21 in (533 mm) chuck, 2070 mm (81.5 in) of turning length and 150 mm (5.9 in) of Y travel served by 4,000 rpm live tools. Maximum turning diameter is 610 mm (24 in).

On a machine this size the Y axis changes what can be finished in one chucking. Keyways, flats, off-centre holes and bolt patterns on a long, heavy shaft would otherwise mean craning the part onto a boring mill and aligning it a second time. Here the 12-station turret does that work with the part still between its supports. Y rapid is 12 m/min (472 ipm), slower than the 20 m/min (787 ipm) of X and the 18 m/min (709 ipm) of Z, which is of little consequence over a 150 mm stroke.

The spindle turns at up to 1,500 rpm. WIA lists the drive as 2 Step Gear + Belt, power as 45 / 37 kW (60.3 / 49.6 hp) and torque as 2,990 / 2,459 N·m (2,205.4 / 1,813.8 ft-lbf). Two gear steps let a motor hold its power over a wider span of spindle speeds, which is what a part with both large and small diameters needs.

The same size class is available without the Y axis: the L5100L Series turns 760 mm (29.9 in) in diameter and 2205 mm (86.8 in) long, and lists 4,112 / 3,382 N·m (3,033 / 2,494.6 ft-lbf) from the same motor figures. Choosing the L5100LY therefore means giving up turning diameter and spindle torque to gain milling off the centreline. X travel is 360 mm (14.2 in) and Z travel 2,120 mm (83.5 in).