Yasda YBM Vi40
Key Specifications
X Travel
Y Travel
Z Travel
Spindle Taper
Tool Capacity
Table Size
Overview
The Yasda YBM Vi40 is an ultra-precision vertical machining center representing the state of the art in CNC machining accuracy. Yasda Precision Tools, based in Okayama, Japan, builds a small number of machines per year and is known within precision manufacturing circles as producing the most accurate production CNC machining centers available commercially. The YBM Vi40 achieves positioning accuracy of ±0.0001 mm (0.1 micron) — a specification that overlaps with coordinate measuring machine accuracy and surpasses conventional machining center specifications by a factor of ten or more.
The YBM Vi40 is built on a granite base and column structure, chosen for its thermal stability (near-zero thermal expansion coefficient), vibration-damping characteristics, and freedom from residual manufacturing stresses inherent in cast iron. All axes use full-closed-loop control with precision linear scales measuring to 0.01 micron resolution. The machine is typically installed in a temperature-controlled room (20°C ±0.5°C) to exploit its full accuracy potential, and Yasda provides thermal equilibration procedures for each installation.
Table size is 400 x 400 mm with X/Y/Z travels of 400 x 300 x 300 mm. The 60,000 RPM air-bearing spindle — Yasda's signature feature — operates at near-zero runout and is designed for grinding, precision boring, and fine finish milling of precision molds, stamping dies, optics mounts, and semiconductor components. Tool taper is HSK-E32 (for grinding and fine boring) with adapter options for small-diameter end mills.
The YBM Vi40 is not a production machine in the conventional sense. It is a tool-room and precision laboratory machine used to produce reference parts, master gages, EDM electrodes, precision molds, and semiconductor lithography components where 0.1-micron accuracy is the requirement rather than a goal.
Full Specifications
| Parameter | Value |
|---|---|
| Table Size | 400 x 400 mm (15.7 x 15.7 in) |
| X-Axis Travel | 400 mm (15.7 in) |
| Y-Axis Travel | 300 mm (11.8 in) |
| Z-Axis Travel | 300 mm (11.8 in) |
| Max Table Load | 200 kg (441 lb) |
| Spindle Type | Air-bearing, ultra-precision |
| Spindle Speed | Up to 60,000 RPM |
| Spindle Taper | HSK-E32 (primary) / adapter options for small-shank tooling |
| Spindle Runout | <0.1 µm (TIR) |
| Spindle Motor Power | 3.7 kW (5 hp) |
| Rapid Traverse Rate | 15 m/min (590 ipm) X/Y; 10 m/min (394 ipm) Z |
| Feed Rate | 0.001–6,000 mm/min |
| Positioning Accuracy | ±0.0001 mm (±0.1 µm) full stroke |
| Repeatability | ±0.00005 mm (±0.05 µm) |
| Scale Resolution | 0.01 µm (10 nm) |
| Feedback | Full-closed loop, ultra-precision linear scales, all axes |
| Thermal Compensation | Machine structure: granite (low thermal expansion). Temperature-controlled installation recommended (20°C ±0.5°C) |
| Base Material | Natural granite |
| Way Type | Hydrostatic or ultra-precision linear guides |
| Tool Capacity | 20 (standard ATC) |
| CNC Control | FANUC 31i-B5 (high-precision configuration) |
| Machine Weight | 6,000 kg (13,228 lb) |
Specifications sourced from yasda.com — verified 2026-03-28
Strengths & Limitations
Strengths
- ±0.0001 mm (0.1 micron) positioning accuracy is the tightest specification available on a production CNC machining center — overlaps with CMM accuracy
- Granite base and column provide near-zero thermal expansion and exceptional vibration isolation — foundational to sustaining sub-micron accuracy
- 60,000 RPM air-bearing spindle with <0.1 µm runout enables precision grinding, fine boring, and ultra-smooth surface finishing on hardened tool steels
- Scale resolution of 0.01 µm (10 nanometers) provides position feedback finer than most dimensional metrology equipment
- Used by leading semiconductor equipment, optics, and precision mold manufacturers globally — Yasda machines produce parts that enable other precision processes
- Each machine is hand-assembled and calibrated by Yasda's master craftsmen at the Okayama factory under controlled conditions
Limitations
- Price of $1.2–2M and extremely specialized capability limits the market to precision tool rooms, national laboratories, and semiconductor/optics manufacturers
- Requires temperature-controlled installation environment (20°C ±0.5°C) — building HVAC modifications typically cost $50–200K additional
- Very low rapid traverse (15 m/min) makes the YBM Vi40 unsuitable for any production volume work — it is a tool room and reference part machine
- Air-bearing spindle requires clean, dry, oil-free compressed air — dedicated compressor and filtration system are mandatory
- Granite structure means the machine cannot be relocated without special handling — foundation and environment planning must be done before purchase
- Yasda produces a very limited number of machines per year; lead times of 12–24 months are common
Best For
Frequently Asked Questions
01
Most precision machining centers, including top-tier machines from Mitsui Seiki, Kitamura, and Makino, specify ±0.001 mm (1 micron) positioning accuracy. The Yasda YBM Vi40 specifies ±0.0001 mm (0.1 micron) — ten times more accurate. To put this in context, a human hair is approximately 70 microns in diameter; the Yasda's guaranteed positional uncertainty is less than one-thousandth of a human hair diameter.
02
Granite has a thermal expansion coefficient of approximately 6–8 ppm/°C, compared to cast iron at 10–12 ppm/°C. At sub-micron accuracy levels, even small temperature changes cause significant thermal expansion. More importantly, granite is manufactured (quarried and lapped) with near-zero residual stress, unlike cast iron which can continue to release stress over decades and cause geometric drift. Yasda selects granite blocks for low natural vibration and laps reference surfaces to optical flatness.
03
An air-bearing spindle uses a film of compressed air to support the rotating spindle shaft, replacing conventional ball bearings. The air film is continuous and has no rolling element contact, which eliminates the runout errors inherent in even the highest-quality ball bearings. Yasda's air-bearing spindle achieves <0.1 µm TIR (Total Indicated Runout), which means the cutting edge describes a circle accurate to 0.1 microns. At 60,000 RPM, this enables precision grinding and boring impossible with conventional bearings.
04
The YBM Vi40 requires: (1) a temperature-controlled room maintained at 20°C ±0.5°C year-round, (2) a vibration-isolated foundation — Yasda provides foundation specifications, (3) clean, dry, oil-free compressed air at specified pressure for the air bearing spindle, (4) leveled and grouted to Yasda's specification using precision levels. Total installation cost including HVAC modifications typically ranges from $100,000 to $400,000 depending on facility starting condition.
05
Typical applications include: precision injection mold inserts for optical lenses and LED components (surface accuracy within 0.1 µm), semiconductor wafer handling and positioning stage components, master EDM electrodes for subsequent precision die-sinking, reference gage bodies, precision mirror substrates for laser systems, and hard disk drive component tooling. The machine does not run high volumes — it produces a small number of extremely critical components where accuracy cost justifies the machine investment.
Videos
Methods Machine Tools, Inc
Methods Machine Tools, Inc
Methods Machine Tools, Inc
YASDA Europe
むぎっ
