Okuma MU-4000V

The Okuma MU-4000V is a 5-axis machining center for small parts: a ø400 mm (15.7 in) table, a maximum workpiece height of 400 mm (15.7 in) and a machining volume of X: 740 Y: 460 Z: 460 mm (X: 29.13 Y: 18.11 Z: 18.11 in).

What separates it from its larger siblings is the spindle. The standard unit runs at 15,000 rpm with 22/18.5 kW (30/25 hp), and 20,000 and 25,000 rpm spindles are the bracketed options. The MU-5000V and MU-6300V are both listed with 11/7.5 kW (15/10 hp). So the smaller table carries the higher listed spindle power, which points this machine at fast work in aluminium and at small, hard parts cut with small tools, not at scaled-down heavy milling.

Tool storage comes in steps. The standard magazine holds 32 tools, 48-tool and 64-tool chain magazines are options, and beyond 64 tools Okuma lists a matrix magazine. For a cell that runs many part numbers without an operator, magazine size is often settled before anything else, and here it can be chosen independently of the machine size.

Rapid traverse is 50 m/min (1,969 ipm) on X, Y and Z, and Okuma lists a B-axis speed of 50 min⁻¹. With 740 mm of X over a 400 mm table, the linear travel is nearly double the table diameter, which gives the spindle room to reach a part tilted well away from vertical. The matching 400 mm figures for table diameter and workpiece height describe a part envelope about as tall as it is wide. Okuma's headline rows do not include a table load, so confirm it for dense workpieces.