Okuma VTR-350A

Est. $1,000,000 - $2,500,000 Updated 2026-08-10

Key Specifications

Tool Capacity

23 tools

Table Size

Ø3,000 mm (Ø118.11 in)

Max Turn Length

1,600 mm (62.99 in) [2,000; 2,400 mm (78.74; 94.49 in)]

max turning diameter

Ø3,500 mm (Ø137.79 in), max swing

max table load

20,000 kg (44,000 lb)

z axis travel ram

1,250 mm (49.21 in) [1,500 mm (59.06 in)]

Overview

The Okuma VTR-350A is a large vertical turning centre — a rotating table with a vertical ram working above it, the configuration used when a part is too large and too heavy to hang off a horizontal spindle. The table is Ø3,000 mm (Ø118.11 in) and carries up to 20,000 kg (44,000 lb). Maximum swing is Ø3,500 mm (Ø137.79 in) and maximum turning length is 1,600 mm (62.99 in), with 2,000 mm and 2,400 mm (78.74 and 94.49 in) available.

The table drive tells the story. It runs from 1 to 160 min⁻¹ from a 55/45 kW (74/60 hp) motor producing 42.5/34.8 kNm (31,346/25,667 lb-ft), or 58.0/46.4 kNm (42,779/34,223 lb-ft) in the higher-torque specification. A 160 min⁻¹ ceiling is no limitation on a machine this size: at three metres of diameter the table need only turn slowly to reach a normal cutting speed, and what matters instead is having tens of kilonewton-metres available to hold that speed through an interrupted cut in a large casting or weldment. The 1 min⁻¹ floor supports slow, heavy boring and facing under full load.

Vertical range is split between a 1,250 mm (49.21 in) ram stroke on Z, with a 1,500 mm (59.06 in) option, and an elevating rail on W offering 800 mm (31.50 in) as standard or 1,000 mm and 1,200 mm (39.37 and 47.24 in). Splitting it that way keeps the ram short and stiff while cutting and still allows tall parts: the rail is repositioned between operations rather than used as a cutting axis, so ram overhang stays under control at any working height.

The C axis gives full 360° positioning with a 0.001° minimum control angle, so drilled and milled features can be indexed accurately around the part without moving it to another machine. Tool capacity is 23.

The machine occupies 8,615 × 5,374 × 6,300 mm (339.17 × 211.57 × 248.03 in). The height figure is the one most likely to disqualify a building, so ceiling clearance and crane hook height are worth confirming before anything else. Typical work is large rings, flanges, casings, rotors and housings in power generation, marine, mining and heavy fabrication.

Full Specifications

Parameter	Value
Max Turning Diameter	Ø3,500 mm (Ø137.79 in), max swing
Max Turning Length	1,600 mm (62.99 in) [2,000; 2,400 mm (78.74; 94.49 in)]
Table Size	Ø3,000 mm (Ø118.11 in)
Max Table Load	20,000 kg (44,000 lb)
Z Axis Travel Ram	1,250 mm (49.21 in) [1,500 mm (59.06 in)]
W Axis Elevating Rail	800 mm (31.50 in) [1,000; 1,200 mm (39.37; 47.24 in)]
Spindle Speed	1~160 min⁻¹
Spindle Motor Power	55/45 kW (74/60 hp)
Spindle Torque	42.5/34.8 kNm (31,346/25,667 lb-ft) [58.0/46.4 kNm (42,779/34,223 lb-ft)]
C Axis	360° (minimum control angle 0.001°)
Tool Capacity	23 tools
Machine Dimensions	8,615 × 5,374 × 6,300 mm (339.17 × 211.57 × 248.03 in)

Specifications sourced from okuma.com — verified 2026-08-09

Strengths & Limitations

Strengths

A Ø3,000 mm (Ø118.11 in) table rated for 20,000 kg (44,000 lb) takes parts that cannot be hung off a horizontal spindle at all
Maximum swing is Ø3,500 mm (Ø137.79 in), with turning length of 1,600 mm (62.99 in) as standard and 2,000 mm or 2,400 mm (78.74 or 94.49 in) available
Table torque of 42.5/34.8 kNm (31,346/25,667 lb-ft), or 58.0/46.4 kNm (42,779/34,223 lb-ft) in the higher-torque specification, is what holds cutting speed through an interrupted cut in a large casting
The 1 min⁻¹ floor on the table supports slow, heavy boring and facing under full load
Vertical range is split between a 1,250 mm (49.21 in) ram stroke on Z and an 800 mm (31.50 in) elevating rail on W, keeping the ram short and stiff while still reaching tall parts
A full 360° C axis with a 0.001° minimum control angle lets drilled and milled features be indexed accurately around the part without moving it to another machine

Limitations

Tool capacity is 23, which is thin for a machine expected to turn, bore and index milled features on a large part complete
Table speed tops out at 160 min⁻¹, so smaller-diameter features on a large part run at low surface speed
The machine measures 8,615 x 5,374 x 6,300 mm (339.17 x 211.57 x 248.03 in), and the 6,300 mm height is the figure most likely to disqualify a building - check ceiling clearance and crane hook height before anything else
A 20,000 kg (44,000 lb) table rating means the foundation has to be specified for the parts as well as for the machine
The elevating rail on W is repositioned between operations rather than used as a cutting axis, so tall parts need planning around rail moves

Best For

Large rings, flanges, casings, rotors and housings in the Ø3,500 mm class Power generation - turbine casings, generator housings, large pressure components Marine work: propeller hubs, large flanges, heavy engine components Oil and gas bodies, large valve housings and subsea components Mining and heavy fabrication - bearing housings, gear rings, crusher components Parts heavy enough that crane handling rather than cutting dominates the setup

Frequently Asked Questions

01 What size and weight of part does the VTR-350A take?

The table is Ø3,000 mm (Ø118.11 in) and carries up to 20,000 kg (44,000 lb). Maximum swing is Ø3,500 mm (Ø137.79 in) and maximum turning length is 1,600 mm (62.99 in), with 2,000 mm and 2,400 mm (78.74 and 94.49 in) available. For very heavy parts the machine and its foundation need specifying together rather than separately.

02 Is 160 min⁻¹ fast enough for productive turning?

On a machine this size, yes. At around three metres of diameter the table only needs to turn slowly to reach a normal cutting speed in steel or cast iron. What matters instead is torque: 42.5/34.8 kNm (31,346/25,667 lb-ft), or 58.0/46.4 kNm in the higher-torque specification, to hold that speed through an interrupted cut. Small-diameter features on a large part are where the 160 min⁻¹ ceiling shows.

03 Why is vertical range split between Z and W?

The ram travels 1,250 mm (49.21 in) on Z, with a 1,500 mm (59.06 in) option, and the rail elevates 800 mm (31.50 in) on W, with 1,000 mm and 1,200 mm available. Splitting it that way keeps the ram short and stiff while cutting and still allows tall parts: the rail is repositioned between operations rather than used as a cutting axis, so ram overhang stays under control at any working height.

04 What does the C axis add?

Full 360° positioning with a 0.001° minimum control angle. Combined with the 23-station tool capacity, that means drilled and milled features - bolt circles, cross-holes, indexed faces - can be produced in the same setup as the turning. On parts weighing several tonnes, avoiding a transfer to a separate machining centre is usually worth more than the cutting time itself.