ROMI VT 5000

The ROMI VT 5000 belongs to a different order of size from the M models below it. Its table accepts 90,000 kg (198,400 lbs), its chuck is 5,000 mm (197 in) across, and it turns parts up to 7,000 mm (276 in) in diameter and 4,000 mm (157 in) high. The machine itself weighs 207,000 kg (456,400 lbs).

At this scale the sliding surfaces are hydrostatic. Romi supports the main gear of the table on a hydrostatic system and uses the same principle for the vertical axis, which keeps wear low under loads that would mark a conventional way. The X axis is moved by a preloaded double pinion on a steel rack, and the ram grows to a 350 x 350 mm (13.8 x 13.8 in) forged section with 2,000 mm (79 in) of travel.

Table speed is 0 to 50 rpm in two ranges, the first 0 to 25 rpm. Two 54 kW motors drive the chuck together, listed as 2 x 72 hp / 2 x 54 kW. The chuck is an 8-jaw independent type in cast iron. For milling and drilling the ram carries an ISO 50 driven tool rated 40 hp / 30 kW at 3 to 3,000 rpm, fed from a 10-tool magazine, half the count of the smaller machines.

Programmed X travel is 3,910 mm (154 in) and the cross rail moves over 2,976 mm in 8 positions. Rapids are 10 m/min (394 in/min). Installation is a civil engineering job: 12.2 m (480 in) of height and 18.3 x 10.6 m (720 x 417 in) of floor. Typical work is hydro turbine runners, large gear rims, kiln tyres and nuclear or mining components.