Machine Comparison
Okuma MULTUS U4000 vs Okuma MULTUS U5000
Okuma vs Okuma · Mill-Turn Machines
Summary
The Okuma MULTUS U4000 and the Okuma MULTUS U5000 are sister mill-turn machines with the same published envelope and tooling: a 650 mm (25.59 in) maximum turning diameter, a JIS A2-8 spindle nose with JIS A2-11 as an option, 40 tools and the same rapid traverse rates, up to 1,968 ipm on Xa/Za.
The difference in the table is spindle power. The Okuma MULTUS U5000 is rated 37/30 kW (49/40 hp) against 22/15 kW (30/20 hp) on the Okuma MULTUS U4000. Both list a 45 rpm to 4,200 rpm spindle range, and the Okuma MULTUS U5000 also lists a second range of 30 rpm to 3,000 rpm.
Specifications Comparison
| Specification | Okuma MULTUS U4000 | Okuma MULTUS U5000 |
|---|---|---|
| Max Turning Diameter | 650 mm (25.59 in) | 650 mm (25.59 in) |
| Max Spindle Speed | 45–4,200 rpm | 45–4,200 rpm (30–3,000 rpm) |
| Spindle Power | 22/15 kW (30/20 hp) | 37/30 kW (49/40 hp) ▲ |
| Spindle Taper / Nose | JIS A2-8 [JIS A2-11] | JIS A2-8 [JIS A2-11] |
| Tool Capacity | 40 tools | 40 tools |
| Rapid Traverse | Xa/Za 50 m/min (1,968 ipm); Zb/Y 40 m/min (1,574 ipm); Xb 25 m/min (980 ipm) | Xa/Za 1,968 ipm; Zb/Y 1,574 ipm; Xb 980 ipm |
Advantages
Okuma MULTUS U4000
- Same 650 mm (25.59 in) turning diameter, 40 tools and 4,200 rpm top speed for work that does not need the larger motor
- Described for chucking and shaft parts whose cuts stay within 22/15 kW (30/20 hp)
Okuma MULTUS U5000
- 37/30 kW (49/40 hp) spindle against 22/15 kW (30/20 hp)
- Described for heavy roughing and tough materials within the same 650 mm (25.59 in) turning diameter
- Also lists a 30 rpm to 3,000 rpm spindle range alongside 45 rpm to 4,200 rpm
Verdict
With the same 650 mm (25.59 in) turning diameter, 40 tools and rapid rates, this choice is about spindle power alone. Heavy roughing and tough materials justify the Okuma MULTUS U5000 and its 37/30 kW (49/40 hp) rating. Chucking and shaft work whose cuts stay within 22/15 kW (30/20 hp) is covered by the Okuma MULTUS U4000, which reaches the same 4,200 rpm. Nothing else in the published figures separates the two.