Mitsui Seiki H6D
This model was not found in Mitsui Seiki's current lineup when we checked on 2026-10-03 . It may be a superseded or older model; the specifications below are as we last recorded them.
Key Specifications
X Travel
Y Travel
Z Travel
Spindle Taper
Tool Capacity
Table Size
How much does the Mitsui Seiki H6D cost?
Estimated price range
Our best estimate for a cnc boring machine in this class — not a quote from Mitsui Seiki. Configuration moves it a long way.
Overview
The Mitsui Seiki H6D is listed as a CNC boring machine with a BT50 spindle, hand-scraped box guideways and travels of 600 x 700 x 500 mm (23.6 x 27.6 x 19.7 in). Mitsui Seiki's current lineup does not include it, so it may be an older model, and the listed figures contain rows that disagree, noted at the end.
Everything in the table favours precision over pace. Rapid traverse is 15 m/min (591 ipm), because scraped box guideways trade speed for damping and geometric accuracy. Scale resolution is listed at 0.1 µm, positioning accuracy at ±2.0 µm and repeatability at ±1.0 µm. The B axis indexes to ±1 arc-second, which is what lets a bore machined from one side line up with one machined after the table has turned.
The spindle is BT50 at 6,000 rpm with a 15 kW (20 HP) continuous motor: a large taper for rigidity with boring bars, at a speed and power that suit finishing bores more than removing volume. The magazine holds 30 tools. Table load is 800 kg (1,764 lb) and the machine weighs 9,000 kg (19,842 lb).
Two things in the listed figures need resolving on the machine. The table-size rows give different dimensions, so measure the table. The control is also described differently in two rows. Neither affects the travels, which appear once.
Full Specifications
| Parameter | Value |
|---|---|
| X-Axis Travel | 600 mm (23.6 in) |
| Y-Axis Travel | 700 mm (27.6 in) |
| Z-Axis Travel | 500 mm (19.7 in) |
| Table Size | 630 x 500 mm (24.8 x 19.7 in) |
| Max Table Load | 800 kg (1,764 lb) |
| B Axis Indexing | +/-1 arc-second |
| Spindle Speed | 6,000 rpm |
| Spindle Taper | BT50 |
| Spindle Motor | 15 kW (20 HP) continuous |
| Positioning Accuracy | +/-2.0 um |
| Repeatability | +/-1.0 um |
| Scale Resolution | 0.1 um |
| Rapid Traverse Rate | 15 m/min (591 ipm) |
| Tool Capacity | 30 tools |
| Guideway Type | Hand-scraped box guideways |
| CNC Control | Fanuc 31i-B |
| Machine Weight | 9,000 kg (19,842 lb) |
| Table Size W315 | Table Size-L31.5" |
| Table Size W | 31.5" |
| Table Size L | 31.5" |
| CNC Control | CNC (FANUC 30iM) |
Specifications compiled from manufacturer literature and industry references. Not independently verified against a published spec sheet — confirm with the manufacturer or an authorised dealer before making a purchasing decision.
Strengths & Limitations
Strengths
- Hand-scraped box guideways, which favour damping and geometry over speed
- Scale resolution of 0.1 µm, with ±2.0 µm positioning accuracy and ±1.0 µm repeatability listed
- B-axis indexing listed at ±1 arc-second
- BT50 spindle taper for rigid boring bars and large tools
Limitations
- Rapid traverse is 15 m/min (591 ipm), so non-cutting time is long on parts with many positions
- Spindle speed stops at 6,000 rpm with 15 kW (20 HP) continuous, which limits small tools and heavy roughing alike
- The magazine holds 30 tools, which can be tight for multi-face jobs
- Table-size rows in the listed figures disagree, so the table has to be measured
Best For
Frequently Asked Questions
01
The listed figures give ±2.0 µm positioning accuracy, ±1.0 µm repeatability and a scale resolution of 0.1 µm. B-axis indexing is listed at ±1 arc-second. These are table values; a used machine should be measured to see what it holds now.
02
Travels are listed at 600 mm (23.6 in) in X, 700 mm (27.6 in) in Y and 500 mm (19.7 in) in Z, with a maximum table load of 800 kg (1,764 lb). The table-size rows in the listed figures do not agree with each other, so confirm the table dimensions directly.
03
The listed rapid traverse is 15 m/min (591 ipm). The machine runs on hand-scraped box guideways, a sliding construction chosen for damping and long-term geometry and not for speed. For comparison the HS5A is listed at 40 m/min (1,575 ipm) on all axes.
04
A BT50 spindle at 6,000 rpm with a 15 kW (20 HP) continuous motor, and a 30-tool magazine. No torque figure is listed. The large taper suits boring bars; the speed and power suit finishing more than heavy stock removal.
Comparisons
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