Okuma MULTUS B400II-W

Est. USD 600,000 - USD 850,000 Updated 2026-08-10

Key Specifications

Tool Capacity

20 tools

Rapid Traverse

40/26 m/min (1,575/1,024 ipm), X,Z/Y

standard chuck size

10 in

max machining diameter

710 mm (27.95 in)

max work length

1,500 / 2,000 mm (59.06 / 78.74 in)

spindle speed

38~3,800 min⁻¹ [30~2,800 min⁻¹ optional]

Overview

The Okuma MULTUS B400II-W is a horizontal multi-tasking machine — a turning centre with a milling spindle — in the second-spindle configuration that the W suffix denotes. The second spindle takes the part in-cycle so both ends are finished on a single datum, which is the reason to specify this variant over the base B400II rather than adding a separate second-operation machine downstream.

The main spindle carries a 10-inch chuck on a JIS A2-8 nose, with a JIS A2-11 nose available as an option for larger workholding. It runs from 38 to 3,800 min⁻¹, or 30 to 2,800 min⁻¹ with the optional larger nose, driven by a 22/15 kW (30/20 hp) motor rated at 50% ED and continuous respectively. The bottom of that speed range matters as much as the top: 38 min⁻¹ means the machine can hold sensible surface speed on large diameters and bore or thread slowly under load without a gear change.

Maximum machining diameter is 710 mm (27.95 in). Maximum work length is either 1,500 mm or 2,000 mm (59.06 or 78.74 in) depending on the bed specified, and that choice drives the footprint: 5,750 × 2,693 × 3,000 mm (226.38 × 106.02 × 118.11 in) for the shorter machine against 7,050 × 2,693 × 3,137 mm (277.56 × 106.02 × 123.50 in) for the longer. The longer bed adds well over a metre of machine length, worth checking against aisle width and crane coverage before specifying it for occasional long parts.

Rapid traverse is 40 m/min (1,575 ipm) on X and Z and 26 m/min (1,024 ipm) on Y. Tool capacity is 20 tools, which is modest for a machine expected to turn and mill a complete part in one cycle. A job needing roughing and finishing turning tools, drills, taps and milling cutters across two ends will consume that magazine, so working the tool list through at the quoting stage is more useful here than on a machine with a deep magazine.

The machine suits shops producing medium-to-large complete parts — shafts, housings, valve bodies, flanges — where the alternative is a turning operation followed by a separate milling setup and a fresh datum.

Full Specifications

Parameter	Value
Standard Chuck Size	10 in
Max Machining Diameter	710 mm (27.95 in)
Max Work Length	1,500 / 2,000 mm (59.06 / 78.74 in)
Spindle Speed	38~3,800 min⁻¹ [30~2,800 min⁻¹ optional]
Spindle Nose	JIS A2-8 [JIS A2-11]
Spindle Motor	22/15 kW (30/20 hp), 50% ED/cont
Rapid Traverse Rate	40/26 m/min (1,575/1,024 ipm), X,Z/Y
Tool Capacity	20 tools
Machine Dimensions	5,750 × 2,693 × 3,000 mm (226.38 × 106.02 × 118.11 in); 7,050 × 2,693 × 3,137 mm (277.56 × 106.02 × 123.50 in)
Spec Extension	W (second-spindle specification)

Specifications sourced from okuma.co.jp — verified 2026-08-09

Strengths & Limitations

Strengths

The W specification includes a second spindle, so the part is taken in-cycle and both ends are finished on a single datum rather than re-chucked on a second machine
Maximum machining diameter of 710 mm (27.95 in) on a 10-inch chuck covers substantial flange, housing and shaft work
The main spindle runs from 38 min⁻¹ upward, and that low floor lets the machine bore and thread slowly under load on large diameters without a gear change
Two bed lengths give 1,500 mm or 2,000 mm (59.06 or 78.74 in) of work length, and a JIS A2-11 spindle nose is available for larger workholding
Rapid traverse of 40 m/min (1,575 ipm) on X and Z keeps positioning time down across the many short operations a complete-part cycle involves

Limitations

Tool capacity is 20 tools, which is modest for a machine expected to turn and mill a complete part across two ends
The spindle motor is 22/15 kW (30/20 hp) at 50% ED and continuous - plan sustained programs against the 15 kW figure
Maximum spindle speed is 3,800 min⁻¹, or 2,800 min⁻¹ with the optional larger A2-11 nose, so small-diameter aluminium work will not reach productive surface speeds
The 2,000 mm bed takes the machine to 7,050 mm long against 5,750 mm for the shorter version - over a metre more, worth checking against aisle width and crane coverage

Best For

Medium-to-large complete parts - shafts, housings, valve bodies, flanges - that would otherwise need a turning operation and a separate milling setup Work where concentricity between the two ends matters enough to justify a single chucking Oil and gas, aerospace and industrial components within 710 mm (27.95 in) of diameter Shops replacing a lathe-then-mill route on medium volumes rather than chasing the fastest possible cycle

Frequently Asked Questions

01 What does the W in B400II-W mean?

W is the second-spindle specification. The second spindle takes the part from the main spindle in-cycle, so both ends are finished on a single datum. That is the reason to specify this variant over the base B400II rather than adding a separate second-operation machine downstream.

02 What size work does the B400II-W take?

Maximum machining diameter is 710 mm (27.95 in), on a standard 10-inch chuck with a JIS A2-8 spindle nose. Maximum work length is either 1,500 mm or 2,000 mm (59.06 or 78.74 in), depending on the bed specified.

03 How fast does the main spindle turn?

From 38 to 3,800 min⁻¹ as standard, or 30 to 2,800 min⁻¹ with the optional JIS A2-11 nose. The bottom of that range matters as much as the top: 38 min⁻¹ means the machine can hold a sensible surface speed on large diameters, and bore or thread slowly under load, without a gear change.

04 Is a 20-tool capacity enough?

It is the specification's most obvious constraint. A job needing roughing and finishing turning tools, drills, taps and milling cutters across two ends will consume 20 pockets. On a machine sold on completing parts in one cycle, working the tool list through at the quoting stage is more useful here than on a machine with a deep magazine.

05 How much floor space does it need?

The 1,500 mm machine measures 5,750 x 2,693 x 3,000 mm (226.38 x 106.02 x 118.11 in). The 2,000 mm machine measures 7,050 x 2,693 x 3,137 mm (277.56 x 106.02 x 123.50 in). The longer bed adds well over a metre of length and a little height, so check aisle width and crane coverage before specifying it for occasional long parts.

06 How much power does the main spindle have?

The motor is rated 22/15 kW (30/20 hp) at 50% ED and continuous respectively. Plan sustained production against the 15 kW continuous figure and treat the 22 kW rating as headroom for roughing passes rather than as an all-shift number.