Kitamura Mytrunnion-4G
Image: kitamura-machinery.com, Kitamura Machinery
Key Specifications
X Travel
Y Travel
Z Travel
Max Spindle
Spindle Taper
Tool Capacity
How much does the Kitamura Mytrunnion-4G cost?
Estimated price range
Our best estimate for a 5-axis machining center in this class — not a quote from Kitamura Machinery. Configuration moves it a long way.
Overview
The Kitamura Mytrunnion-4G is a trunnion-table 5-axis machining center with a Ø400 mm (Ø15.7 in) table and a square working envelope: 610 mm (24 in) of travel in both X and Y and 550 mm (21.7 in) in Z. The standard spindle is a direct-drive, dual-contact NST No. 40 unit running 40 - 15,000 rpm at 15 HP, with a 20,000 rpm spindle and an HSK-A63 interface both listed as options.
Travel well beyond the table diameter is what makes the layout work. The maximum workpiece is Ø550 mm (Ø21.7 in) x 400 mm (15.7 in), larger than the table itself, and the linear axes have the stroke to reach around a part of that size when it is tilted. The A axis covers 150° (-120 to +30°) and C turns 0 to 360°. Table load is the figure to watch: Kitamura lists 440 lb, and that has to cover fixture and part together.
The rotary axes are quick. Kitamura lists 50 rpm (18,000 deg/min) and 150 rpm (54,000 deg/min), speeds that suit simultaneous contouring as well as indexing. Linear rapids are 50 m/min (1,969 ipm) on X and Y and 25 m/min (984 ipm) on Z, so Z is the slow axis on retract-heavy programs. Positioning accuracy is ±0.002 mm (±0.000079 in) over full stroke with ±0.001 mm (±0.000039 in) repeatability.
The magazine holds 60 tools, with 100 tools optional, and the control is Kitamura's Arumatik-Mi CNC. Power demand is 50 kVA. The Mytrunnion-5G is the next size up, with a Ø630 mm (Ø24.8 in) table, 815 mm (32.1 in) of X and a 4-step gear-driven spindle covering 20 - 20,000 rpm; it carries 50 tools as standard where the Mytrunnion-4G carries 60.
Full Specifications
| Parameter | Value |
|---|---|
| X-Axis Travel | 610 mm (24 in) |
| Y-Axis Travel | 610 mm (24 in) |
| Z-Axis Travel | 550 mm (21.7 in) |
| Max Spindle Speed | 40 - 15,000 rpm, **20,000 rpm Option |
| Spindle Taper | NST No. 40 (HSK-A63 optional) |
| Spindle Motor Power | 15 HP |
| Spindle Drive | Direct Drive, Dual Contact |
| Tool Capacity | 60 tools (100 Tools optional) |
| Trunnion Table Diameter | 400 mm (15.7 in) |
| A Axis Range | 150° (-120 to +30°) |
| C Axis Range | 0 to 360° |
| Rotary Axis Speed | 50 RPM (18,000 deg/min) |
| Positioning Accuracy | ±0.002 mm (±0.000079″)/Full stroke |
| Repeatability | ±0.001 mm (±0.000039″) |
| Table Size | Ø400 mm (Ø15.7 in) |
| Table Load Max | 440 Lbs |
| CNC Control | Arumatik-Mi CNC |
| Rapid Traverse Rate | X,Y: 50 m/min (1,969 ipm); Z: 25 m/min (984 ipm) |
| Max Workpiece Size | Ø550 mm (Ø21.7 in) x 400 mm (15.7 in) |
| Rotary Indexing Speed | 50 rpm (18,000 deg/min), 150 rpm (54,000 deg/min) |
| Power Supply | 50 kVA |
Specifications sourced from kitamura-machinery.com — verified 2026-10-03
Strengths & Limitations
Strengths
- 610 mm (24 in) of X and Y travel around a Ø400 mm (Ø15.7 in) table, with a maximum workpiece of Ø550 mm (Ø21.7 in) x 400 mm (15.7 in)
- Rotary speeds of 50 rpm (18,000 deg/min) and 150 rpm (54,000 deg/min)
- Positioning accuracy of ±0.002 mm (±0.000079 in) over full stroke and ±0.001 mm (±0.000039 in) repeatability
- 60-tool magazine as standard, more than the 50 tools of the larger Mytrunnion-5G
- Direct-drive, dual-contact NST No. 40 spindle with a 40 - 15,000 rpm range
Limitations
- Table load is 440 lb, which limits fixture mass on steel parts near the size limit
- Standard spindle power is 15 HP, so heavy roughing in tough materials is not what it is sized for
- 20,000 rpm and HSK-A63 are options, not part of the standard machine
- Z rapid is 25 m/min (984 ipm), half the 50 m/min (1,969 ipm) of X and Y
Best For
Frequently Asked Questions
01
X and Y travel are both 610 mm (24 in) and Z is 550 mm (21.7 in). The table is Ø400 mm (Ø15.7 in) and Kitamura lists a maximum workpiece of Ø550 mm (Ø21.7 in) x 400 mm (15.7 in). The A axis has a range of 150° (-120 to +30°) and the C axis 0 to 360°.
02
Kitamura lists a maximum table load of 440 lb. Fixture, workholding and part all count toward it. A part that fills the Ø550 mm (Ø21.7 in) x 400 mm (15.7 in) envelope in steel can exceed that weight, so check mass as well as size.
03
The standard spindle is NST No. 40, direct drive with dual contact, 40 - 15,000 rpm and 15 HP. Kitamura lists a 20,000 rpm spindle as an option and HSK-A63 as an optional interface. The table gives no power figure for the 20,000 rpm option.
04
The Mytrunnion-5G is larger: a Ø630 mm (Ø24.8 in) table with 815 mm (32.1 in), 745 mm (29.3 in) and 500 mm (19.7 in) of X, Y and Z, and a 4-step gear-driven spindle covering 20 - 20,000 rpm. The Mytrunnion-4G has the Ø400 mm (Ø15.7 in) table, more Z at 550 mm (21.7 in) and a direct-drive spindle. Rapids are the same on both, 50 m/min (1,969 ipm) on X and Y and 25 m/min (984 ipm) on Z.
05
Positioning accuracy is ±0.002 mm (±0.000079 in) over full stroke and repeatability is ±0.001 mm (±0.000039 in). The control is Kitamura's Arumatik-Mi CNC, and the machine draws 50 kVA.
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