Kitamura Machinery 5-Axis Machining Centers

Kitamura Kitamura Mytrunnion-4G

$280,000 - $400,000 Updated 2026-03-19

Key Specifications

X Travel

610 mm (24″)

Y Travel

610 mm (24″)

Z Travel

550 mm (19.7″)

Max Spindle

15,000 min⁻¹ (20,000 min⁻¹ Option)

Spindle Taper

NST No. 40 (HSK-A63 Opt.)

Tool Capacity

60 Pcs. – 100 Tools Optional

Overview

The Kitamura Mytrunnion-4G is a trunnion-table 5-axis machining center built around Kitamura's hand-scraped precision platform, offering the rigidity advantage of a tilting rotary table design for aggressive 5-axis simultaneous machining. With 610 x 610 x 550 mm (24 x 24 x 19.7 in) X/Y/Z travels and a 400 mm (15.7 in) diameter trunnion table, the Mytrunnion-4G provides a practical work envelope for precision small-to-medium 5-axis parts.

The 15,000 RPM dual-contact spindle with NST No. 40 taper (HSK-A63 optional) delivers 11.2 kW (15 hp) through a direct-drive system. An optional 20,000 RPM spindle is available for shops requiring higher finishing speeds. The trunnion table tilts from -120 to +30 degrees on the A-axis with continuous 360-degree C-axis rotation. Rotary axis speed of 50 RPM (18,000 deg/min) on both A and C axes provides smooth simultaneous contouring.

Rapid traverse rates of 50 m/min (1,969 ipm) on X/Y and 25 m/min (984 ipm) on Z provide fast positioning. The 60-tool ATC (expandable to 100 tools) is generous for a machine in this class, supporting complex multi-tool programs without compromise. Table load capacity of 200 kg (440 lb) accommodates a wide range of small-to-medium 5-axis workpieces. Positioning accuracy of plus/minus 0.002 mm with plus/minus 0.001 mm repeatability is standard.

New Mytrunnion-4G machines typically price between $280,000 and $400,000, competing with the DMG Mori CMX 50 U, Makino D200Z, and Hermle C 250. The trunnion-table design provides a rigidity advantage over tilt-head machines for aggressive cutting at compound angles, and Kitamura's hand-scraped surfaces deliver long-term accuracy retention that justifies the investment for precision-focused shops.

Full Specifications

Parameter	Value
X-Axis Travel	610 mm (24″)
Y-Axis Travel	610 mm (24″)
Z-Axis Travel	550 mm (19.7″)
Max Spindle Speed	15,000 min⁻¹ (20,000 min⁻¹ Option)
Spindle Taper	NST No. 40 (HSK-A63 Opt.)
Spindle Motor Power	15 HP
Spindle Drive	Direct Drive, Dual Contact
Tool Capacity	60 Pcs. – 100 Tools Optional
Trunnion Table Diameter	400 mm (15.7 in)
Max Workpiece Height	400 mm (15.7 in)
Max Workpiece Weight	200 kg (440 lb)
A Axis Range	-120° to +30° (150°)
C Axis Range	0° to 360° (continuous)
Rotary Axis Speed	50 RPM (18,000 deg/min)
Rapid Traverse Xy	50 m/min (1,969 ipm)
Rapid Traverse Z	25 m/min (984 ipm)
Positioning Accuracy	±0.002 mm (±0.000079″)/Full stroke
Repeatability	±0.001 mm (±0.000039″)
Power Requirement	45 KVA, 200V AC, 3 Phase
CNC Control	Kitamura Arumatik-Mi (SSS Technology)
Table Size	Ø400 mm (Ø15.7″)
Table Load Max	440 Lbs
Rapid Traverse X	50 m/min (1,969 ipm)
Rapid Traverse Y	50 m/min (1,969 ipm)
Cnc Control	Arumatik-Mi CNC
Electrical	45 KVA, 200 V AC, 3 Phase

Specifications sourced from kitamura-machinery.com — verified 2026-03-28

Strengths & Limitations

Strengths

Trunnion-table design keeps workpiece mass centered on the rotary axes, enabling aggressive 5-axis cutting without deflection
610 x 610 x 550 mm travel provides a practical work envelope for small-to-medium 5-axis parts with hand-scraped precision
60-tool ATC (expandable to 100) is generous for this class, supporting complex multi-tool 5-axis programs
Optional 20,000 RPM spindle upgrade extends high-speed finishing capability for aluminum and titanium
Hand-scraped mating surfaces deliver ±0.002 mm positioning accuracy with long-term retention
SSS (Super Smooth Surface) technology in the Arumatik-Mi control optimizes 5-axis simultaneous surface finish

Limitations

15 hp spindle is modest for aggressive roughing — shops doing heavy 5-axis roughing may need more power
200 kg (440 lb) workpiece weight limit constrains heavier aerospace and industrial parts
25 m/min Z-axis rapids are slower than X/Y, adding time on programs with frequent Z repositioning
Arumatik-Mi control requires retraining for shops standardized on Fanuc or Heidenhain 5-axis platforms

Best For

Aerospace manufacturers machining small-to-medium 5-axis components in titanium, aluminum, and Inconel Medical device manufacturers producing orthopedic implants and surgical instruments with complex 5-axis geometry Precision job shops seeking a versatile 5-axis trunnion machine with hand-scraped accuracy for diverse part types Mold and die shops machining complex 3D cavity and core surfaces requiring 5-axis simultaneous access Shops replacing older 5-axis machines wanting Kitamura's trunnion rigidity and long-term precision retention

Frequently Asked Questions

01 What does a new Kitamura Mytrunnion-4G cost?

New machines typically price between $280,000 and $400,000 depending on spindle option (15K vs 20K RPM), tool capacity (60 or 100 tools), and other options. This is competitive with the DMG Mori CMX 50 U and Makino D200Z.

02 What is the advantage of a trunnion table over a tilt-head design?

A trunnion (tilting rotary table) keeps the spindle stationary while the workpiece tilts and rotates, concentrating mass at the center of rotation. This maintains rigidity at all tilt angles, allowing aggressive cutting forces at compound angles that tilt-head machines cannot match without deflection.

03 Should I choose the 15,000 or 20,000 RPM spindle option?

Choose 20,000 RPM if your work involves significant aluminum finishing or small-diameter tools that benefit from higher speed. The 15,000 RPM standard spindle is adequate for most steel, titanium, and mixed-material work. The 20K option adds cost but provides more versatility for high-speed applications.

04 What CAM software works with the Mytrunnion-4G for 5-axis?

Major 5-axis CAM packages including Mastercam (5-axis module), Hypermill, NX, CATIA, and PowerMill can all post-process for the Arumatik-Mi control with RTCP (Rotary Tool Center Point) support. Post processors are available from Kitamura and the CAM vendors.