Kuraki KBT-15DX

$650,000 - $1,000,000 Updated 2026-03-14

Key Specifications

X Travel

3,000 mm (118.1 in)

Y Travel

2,200 mm (86.6 in)

Z Travel

2,000 mm (78.7 in)

Rapid Traverse

8 m/min (315 IPM)

Spindle Power

37 kW (50 HP)

spindle diameter

150 mm (5.9 in)

Overview

The Kuraki KBT-15DX is the largest table-type horizontal boring mill in Kuraki's DX series, featuring a 150 mm (5.9 inch) spindle diameter that puts it firmly in heavy-duty territory. This machine bridges the gap between mid-range table-type boring mills and full floor-type machines, offering the setup convenience of a table-type design with the spindle rigidity and power typically associated with floor-type configurations. For shops machining large castings up to 15,000 kg that still want the productivity advantages of a table-type layout, the KBT-15DX occupies a unique position in the market.

The 150 mm spindle with 37 kW of power and speeds from 5 to 1,600 RPM delivers the torque needed for heavy boring operations with large-diameter boring bars. The quill extends 700 mm, providing deep reach into complex castings without repositioning the workpiece. X-axis travel of 3,000 mm, Y-axis of 2,200 mm, and Z-axis of 2,000 mm define a working envelope large enough for substantial industrial components — large engine blocks, mining equipment housings, press frames, and turbine casings.

The rotary table on the KBT-15DX is engineered for seriously heavy workpieces. At 15,000 kg capacity with a 2,000 x 2,200 mm table surface, it handles the large castings and fabricated structures common in power generation, marine, and heavy equipment manufacturing. The table provides full CNC rotation with 3 arc-second indexing accuracy — notably tighter than the 5 arc-second spec on the smaller KBT-11DX, reflecting the precision requirements of the larger parts this machine is designed to handle.

Kuraki's DX-series thermal management is even more critical on a machine this size. Thermal growth on a 3-meter X-axis travel can produce positional errors of 30-50 micrometers if left uncompensated. The KBT-15DX uses an expanded sensor array and the Fanuc 31i-B5 control's thermal compensation algorithms to hold positioning accuracy within specifications across the full working envelope. The machine's hand-scraped guideways on all major axes provide the damping characteristics that keep surface finishes smooth during heavy interrupted cuts on rough castings.

Full Specifications

Parameter	Value
Spindle Diameter	150 mm (5.9 in)
Spindle Speed	5 - 1,600 RPM
Spindle Motor Power	37 kW (50 HP)
Spindle Quill Travel	700 mm (27.6 in)
X-Axis Travel	3,000 mm (118.1 in)
Y-Axis Travel	2,200 mm (86.6 in)
Z-Axis Travel	2,000 mm (78.7 in)
Rotary Table Size	2,000 x 2,200 mm (78.7 x 86.6 in)
Max Table Load	15,000 kg (33,069 lb)
Table Indexing Accuracy	3 arc-seconds
Rapid Traverse Rate	8 m/min (315 IPM)
Facing Head	Optional, up to 1,200 mm diameter
CNC Control	Fanuc 31i-B5
Machine Weight	42,000 kg (92,594 lb)
Tool Magazine	60-tool ATC (optional)

Specifications sourced from us.dmgmori.com — verified 2026-03-28

Strengths & Limitations

Strengths

150 mm spindle with 37 kW power handles the heaviest boring operations with large-diameter boring bars and facing heads
Table-type design with 15,000 kg capacity provides the convenience of integrated rotary table with floor-type-level workpiece weight
3 arc-second table indexing accuracy is exceptional for a machine of this size, ensuring precise multi-face bore relationships
3,000 x 2,200 x 2,000 mm travel envelope handles very large industrial components without workpiece repositioning
Hand-scraped guideways on all axes deliver superior damping for smooth surface finishes during heavy interrupted cuts
Expanded thermal compensation system maintains accuracy across the full working envelope during extended machining runs

Limitations

42,000 kg machine weight requires serious foundation engineering and limits installation to facilities with adequate floor loading
8 m/min rapid traverse is slow, resulting in significant non-cutting time when machining large parts with widely spaced features
Price point of $650,000-$1,000,000 is substantial and requires high machine utilization to justify the investment
1,600 RPM maximum spindle speed limits the machine's efficiency on smaller-diameter milling and drilling operations
Lead times of 12-18 months are typical for new machines, requiring long-term capacity planning

Best For

Power generation equipment manufacturers machining turbine casings, generator frames, and large valve bodies Mining and heavy equipment companies boring large structural castings and fabricated housings Marine industry shops machining engine blocks, reduction gear housings, and large shaft components Large job shops specializing in heavy industrial machining that need table-type convenience at floor-type scale Press and stamping die manufacturers boring large die shoes and press frames Facilities needing precise multi-face machining on heavy castings with tight geometric tolerances across large distances

Frequently Asked Questions

01 What does a Kuraki KBT-15DX cost?

New Kuraki KBT-15DX machines price between $650,000 and $1,000,000 depending on table configuration, ATC, and accessories. Used machines from the 2000s-2010s trade in the $250,000-$500,000 range. Installation costs including foundation work can add $50,000-$120,000.

02 How does the KBT-15DX compare to a floor-type boring mill?

The KBT-15DX offers the convenience of an integrated CNC rotary table (faster setups, automatic indexing) with the spindle size and power normally found on floor-type machines. Floor-type machines handle even larger workpieces since the part sits on the floor, but table-type machines are generally more productive for parts within their weight capacity.

03 What foundation is required for a 42,000 kg machine?

The KBT-15DX requires a purpose-designed reinforced concrete foundation typically 400-600 mm thick with vibration isolation from surrounding floor sections. Kuraki provides detailed foundation drawings. A geotechnical survey is recommended before installation to verify soil bearing capacity.

04 Can the KBT-15DX use automatic tool changing?

Yes, a 60-tool ATC is available as an option. For shops running production work, the ATC significantly reduces setup time between operations. Many heavy job shops still prefer manual tool changes for the flexibility to use oversized or special boring bars.

05 What is the advantage of 3 arc-second indexing versus 5 arc-second?

On a large workpiece with bore centers 1,500 mm apart, 5 arc-second indexing error translates to approximately 36 micrometers of positional error. At 3 arc-seconds, that drops to approximately 22 micrometers. For critical bore-to-bore relationships in large industrial components, this difference is significant.