Kitamura Machinery 5-Axis Machining Centers

Kitamura MyTrunnion-4G

$300,000 - $450,000 Updated 2026-03-16

Key Specifications

X Travel

350 mm (13.8 in)

Y Travel

280 mm (11 in)

Z Travel

310 mm (12.2 in)

Max Spindle

20,000 RPM

Spindle Taper

CAT 40 / Big Plus (Dual Contact)

Tool Capacity

32-tool ATC

Overview

The Kitamura MyTrunnion-4G is a compact 5-axis machining center built around a fixed trunnion table design that provides exceptional rigidity for 5-axis simultaneous and 5-sided indexed machining. The trunnion configuration — where the workpiece tilts rather than the spindle — keeps the workpiece mass close to the rotary center, minimizing deflection at extended tilt angles and enabling aggressive cutting forces in compound-angle positions that tilt-head machines cannot match.

The MyTrunnion-4G offers 350 x 280 x 310 mm (13.8 x 11 x 12.2 in) X/Y/Z travels around a 400 mm (15.7 in) diameter trunnion table. This compact envelope is specifically suited to small precision parts — aerospace fittings, medical implants, dental components, and precision instrument parts where 5-axis access is required but part size is small. The 20,000 RPM direct-drive Big Plus spindle delivers high-speed finishing capability in aluminum and high-temperature alloys within the machine's precision work envelope.

Kitamura's hand-scraping applies to the MyTrunnion-4G's linear and rotary axis mating surfaces, providing sub-micron positioning accuracy that compact 5-axis machines from DMG Mori and Makino achieve only in their premium configurations. The machine's compact footprint — approximately 2,100 x 2,500 mm — makes it practical for precision specialty cells in medical and dental manufacturing where floor space is at a premium.

At $300,000-$450,000 new, the MyTrunnion-4G competes with the Makino D200Z, DMG Mori CMX 50 U, and Matsuura MAM72-35V. Kitamura's trunnion-table rigidity and hand-scraped precision are genuine differentiators for shops where 5-axis cutting forces and long-term accuracy matter more than the raw envelope size or speed of competing machines.

Full Specifications

Parameter	Value
X-Axis Travel	350 mm (13.8 in)
Y-Axis Travel	280 mm (11 in)
Z-Axis Travel	310 mm (12.2 in)
Trunnion Table Diameter	400 mm (15.7 in)
Max Workpiece Weight	100 kg (220 lb)
Max Spindle Speed	20,000 RPM
Spindle Taper	CAT 40 / Big Plus (Dual Contact)
Spindle Drive	Direct drive
Tool Capacity	32-tool ATC
Chip To Chip	2.5 sec
Rapid Traverse Rate	40/40/40 m/min (1,575 ipm)
A Axis Range	−110° to +30°
C Axis Range	360° (continuous)
Positioning Accuracy	0.002 mm (0.0001 in)
Machine Weight	7,000 kg (15,432 lb)
CNC Control	Kitamura Arumatik-Mi

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

Strengths & Limitations

Strengths

Trunnion-table design keeps workpiece close to rotary center, enabling aggressive 5-axis cutting forces without deflection
20,000 RPM direct-drive spindle with Big Plus provides precision high-speed finishing in aluminum and titanium
Hand-scraped mating surfaces deliver 0.002 mm positioning accuracy for tight-tolerance 5-axis compound features
Compact 2,100 x 2,500 mm footprint fits in precision specialty cells where floor space is limited
32-tool ATC with 2.5-second chip-to-chip supports complex small-part programs efficiently
Trunnion rigidity advantage over tilt-head designs for interrupted cuts and heavy feeds in compound-angle positions

Limitations

350 x 280 x 310 mm travel limits the machine to small workpieces — cannot accommodate medium or large 5-axis parts
100 kg maximum workpiece weight is a significant constraint for aerospace structural components
32-tool ATC capacity constrains complex programs with large tool arrays
Arumatik-Mi control requires retraining for shops standardized on Fanuc or Heidenhain
Kitamura's 5-axis application support is less mature than DMG Mori or Makino in most North American regions

Best For

Medical device manufacturers producing orthopedic implants, dental prosthetics, and surgical instruments requiring 5-axis access Aerospace fastener and fitting suppliers machining small compound-angle features in titanium and Inconel Precision job shops seeking a compact 5-axis machine for small, tight-tolerance parts with genuine rigidity at compound angles Dental milling lab operators requiring high-speed 5-axis finishing of zirconia, PMMA, and metal alloy prosthetics Defense suppliers machining small complex components where 5-axis access and geometric accuracy are both required

Frequently Asked Questions

01 What is the advantage of a trunnion table over a tilt-head in 5-axis machining?

A trunnion (tilting rotary table) keeps the spindle stationary while the workpiece tilts and rotates. This concentrates mass at the center of rotation, maintaining rigidity at all tilt angles. Tilt-head machines must support the spindle at extended angles, which can introduce deflection under cutting forces. For aggressive 5-axis cuts, trunnion tables typically provide better rigidity and chip load consistency.

02 What does a Kitamura MyTrunnion-4G cost?

New MyTrunnion-4G machines typically price between $300,000 and $450,000 depending on options and configuration. This is competitive with the Makino D200Z and DMG Mori CMX 50 U while offering Kitamura's hand-scraped precision advantage.

03 What CAM software works with the MyTrunnion-4G?

The MyTrunnion-4G's Arumatik-Mi control accepts standard G-code with RTCP (Rotary Tool Center Point) cycles for 5-axis simultaneous contouring. CAM software from Mastercam (Mill 5-axis), Hypermill, NX, and CATIA all produce compatible post-processed code. Post processors for the Arumatik-Mi are available from Kitamura and the major CAM vendors.

04 Can the MyTrunnion-4G machine dental prosthetics?

Yes, the MyTrunnion-4G is well-suited to dental milling applications. The 20,000 RPM spindle handles zirconia, PMMA, and cobalt-chrome at appropriate cutting speeds. The machine's accuracy and 5-axis access allow full prosthetic geometries to be produced in one setup. Dedicated dental CAM software (Hypermill Dental, WorkNC Dental) can be post-processed for the Arumatik-Mi control.