Kitamura Machinery 5-Axis Machining Centers

Kitamura Kitamura Mytrunnion-7G

$600,000 - $900,000 Updated 2026-03-19

Key Specifications

X Travel

1,119 mm (46.9 in)

Y Travel

1,380 mm (54.3 in)

Z Travel

765 mm (30.1 in)

Max Spindle

12,000 RPM

Spindle Taper

NST No. 50 (HSK-A100 optional)

Tool Capacity

100-tool ATC

Overview

The Kitamura Mytrunnion-7G is the largest machine in Kitamura's trunnion-table 5-axis lineup, built for simultaneous 5-axis machining of large, heavy workpieces that smaller trunnion machines cannot accommodate. With a 1,000 mm (39.7 in) diameter trunnion table rated for 2,015 kg (4,440 lb), the 7G handles aerospace structural components, large mold bases, and heavy industrial parts that demand full 5-axis access with exceptional rigidity.

The Mytrunnion-7G provides 1,119 x 1,380 x 765 mm (46.9 x 54.3 x 30.1 in) X/Y/Z travels -- a massive work envelope that places it in competition with large-format 5-axis machines from DMG Mori, Okuma, and Mazak. The 12,000 RPM 4-step gear-driven spindle with NST No. 50 taper (HSK-A100 optional) is built for heavy material removal in steel, titanium, and Inconel. The No. 50 taper provides substantially more rigidity and torque capacity than the No. 40 taper found on the smaller Mytrunnion-5G, making the 7G a true production roughing and finishing platform for hard metals.

Kitamura's hand-scraping extends to the Mytrunnion-7G's linear and rotary axis mating surfaces, delivering positioning accuracy of +/-0.002 mm (+/-0.000079 in) and repeatability of +/-0.001 mm (+/-0.000039 in) per full stroke. The 100-tool ATC eliminates tool change interruptions during complex multi-operation programs. Rapid traverse rates of 50 m/min on X/Y and 30 m/min on Z keep cycle times competitive despite the machine's large envelope.

The Mytrunnion-7G is a premium investment at $600,000-$900,000 new, competing with the DMG Mori DMU 100 monoBLOCK, Okuma MU-10000H, and Mazak VARIAXIS i-1050T. For shops that need large-envelope 5-axis capability with trunnion-table rigidity and hand-scraped accuracy, the 7G occupies a unique position in the market.

Full Specifications

Parameter	Value
X-Axis Travel	1,119 mm (46.9 in)
Y-Axis Travel	1,380 mm (54.3 in)
Z-Axis Travel	765 mm (30.1 in)
Trunnion Table Diameter	1,000 mm (39.7 in)
Max Workpiece Weight	2,015 kg (4,440 lb)
Max Spindle Speed	12,000 RPM
Spindle Taper	NST No. 50 (HSK-A100 optional)
Spindle Drive	4-Step Gear Driven
Tool Capacity	100-tool ATC
Rapid Traverse Xy	50 m/min (1,969 ipm)
Rapid Traverse Z	30 m/min (1,181 ipm)
A Axis Range	-120 to +30 degrees
C Axis Range	0 to 360 degrees (continuous)
Positioning Accuracy	+/-0.002 mm (+/-0.000079 in) per full stroke
Repeatability	+/-0.001 mm (+/-0.000039 in)
Power Supply	65 KVA, 200V AC, 3-phase
CNC Control	Kitamura Arumatik-Mi

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

Strengths & Limitations

Strengths

1,000 mm trunnion table with 2,015 kg capacity handles large aerospace and mold components that most 5-axis machines cannot
NST No. 50 gear-driven spindle provides the torque and rigidity needed for heavy roughing in titanium, Inconel, and hardened steel
Hand-scraped mating surfaces deliver +/-0.002 mm positioning accuracy across the full 1,119 x 1,380 x 765 mm envelope
100-tool ATC supports complex multi-operation programs for extended unattended production runs
Trunnion-table architecture maintains rigidity at all tilt angles -- critical advantage for heavy 5-axis cuts on large parts
50 m/min rapids on X/Y keep non-cutting time competitive despite the machine's large travel range

Limitations

12,000 RPM maximum spindle speed is lower than competitors offering 15,000-20,000 RPM for high-speed aluminum finishing
Large footprint and 65 KVA power requirement demand significant facility infrastructure
Arumatik-Mi control requires retraining for shops standardized on Fanuc, Siemens, or Heidenhain
Kitamura's service network for large 5-axis machines is limited compared to DMG Mori or Mazak in most regions

Best For

Aerospace manufacturers machining large structural components, bulkheads, and engine casings requiring 5-axis access Large mold and die shops producing automotive and industrial mold bases with complex 3D surfaces Energy sector manufacturers machining turbine components, impellers, and blisks in nickel alloys Defense contractors producing large precision components where 5-axis accuracy and heavy cutting capability are both required Heavy equipment manufacturers needing 5-axis capability for large, heavy workpieces up to 2,015 kg

Frequently Asked Questions

01 How does the Mytrunnion-7G compare to the Mytrunnion-5G?

The 7G is dramatically larger: 1,119 x 1,380 x 765 mm travels vs 815 x 745 x 500 mm on the 5G, with a 1,000 mm table vs 630 mm. The 7G uses a No. 50 taper spindle for heavier cuts, while the 5G uses No. 40. The 7G handles workpieces up to 2,015 kg vs 400 kg on the 5G. The 5G offers higher spindle speed (20,000 vs 12,000 RPM) for high-speed finishing.

02 What does a Kitamura Mytrunnion-7G cost?

New Mytrunnion-7G machines typically price between $600,000 and $900,000 depending on configuration. This competes with the DMG Mori DMU 100 monoBLOCK and Okuma MU-10000H. The hand-scraped precision and trunnion rigidity are significant differentiators at this price point.

03 What materials can the Mytrunnion-7G handle?

The No. 50 gear-driven spindle is built for heavy material removal in steel, stainless, titanium, Inconel, and other aerospace alloys. The trunnion-table rigidity is particularly advantageous for maintaining stable cutting forces at compound angles in these difficult materials. The 12,000 RPM speed is also adequate for aluminum finishing.

04 Can the Mytrunnion-7G run lights-out?

Yes, the 100-tool ATC, in-process probing capabilities, and Kitamura's thermal stability design support extended unattended operation. The machine's accuracy retention during long runs is enhanced by hand-scraped surfaces, ballscrew cooling, and thermal displacement compensation.