Hyundai WIA KF7700B II Series

The Hyundai WIA KF7700B II Series is a BBT40 vertical machining center with 1,500 mm (59.1 in) of X travel, 760 mm (29.9 in) of Y and 635 mm (25 in) of Z, over a 1650 × 760 mm (65 × 29.9 in) table rated for 1,500 kg (3,307 lb). It sits one size above the KF6700B, which stops at 1,300 mm (51.2 in) of X and 670 mm (26.4 in) of Y with a 1,300 kg (2,866 lb) table load.

What marks out the standard spindle is torque, not speed. WIA lists 15 / 11 kW (20.1 / 14.8 hp) and 286 / 143 N·m (211 / 105.5 ft-lbf) with a top speed of 8,000 rpm. On a 40-taper machine that combination favours face mills, large drills and taps in steel and cast iron over small cutters in aluminium. The optional rating runs the other way: 18.5 / 11 kW (24.8 / 14.8 hp) with 118 / 52.5 N·m (87 / 38.7 ft-lbf), well under half the standard peak torque. A 12,000 rpm top speed is listed as an option too. The table does not say that the two options come together, so confirm which motor a 12,000 rpm machine carries before planning heavy cuts around the 286 N·m figure.

The table is longer than the X stroke, 1650 mm against 1,500 mm, so the ends of a full-length plate fall outside the cut and are better used for clamps and fixture stops. Y is different: travel equals the 760 mm table width, which puts the whole depth of the table within reach. Z travel is the same 635 mm (25 in) as on the KF6700B, so stepping up to this size buys plan area and load capacity, not height under the spindle.

Rapid traverse is 30 m/min (1,181 ipm) in X and Y and 24 m/min (945 ipm) in Z. For work longer than this machine can cover, the KF7600L keeps the 760 mm Y and 635 mm Z but stretches X to 2,100 mm (82.7 in) on a 2250 × 760 mm (88.6 × 29.9 in) table rated for 1,800 kg (3,968 lb). It is not simply a longer copy, though: the KF7600L lists 118 / 71.6 N·m (87 / 52.8 ft-lbf) as its standard spindle torque, so heavy roughing stays with this model.