Sekigahara Seisakusho Ltd.

Characteristics of Natural Stone (gabbro)

Only the most minor changes due to aging

Only the slightest levels of static electricity generated

Stone itself both dampens and prevents vibration

Only small amounts of heat transferred,resulting in stable surface precision

Prevents erosion caused by lapping with a hardness of 2 to 2.5 times that of iron

Surface precision maintained without any burrs even when scratched or scarred

No erosion, thus clean and maintenance-free

What's Unique about Sekigahara Seisakusho

What's Unique about Sekigahara Seisakusho

We only use select natural stone from India and South Africa.

We do all work in-house, from the cutting of the stone to its use in manufacture.

We have received a JIS Grade 0 rating, the highest standard, for our surface precision.

We also provide products with an ever higher rating Grade 00.
Upon request, we can provide customers with maximum rated,
Grade 000, materials.

We do repairs regardless of original manufacturer.
(certification and additional processing also available)

[ Data and Tips ] What is Grade 000 precision ?

In a surface area equal to one square kilometer (big enough to fit 20 Tokyo Domes) there will only be a height differential of two millimeters.

Product Introduction

Product Introduction

Granite Surface Plate

	A testing plate to accurately measure the height (parallelism) of precision components.
	A variety of standard itemsare available at low prices.
	Orders are accepted for non-standard sizes and high-precision equipment.
	Repair service is available on products, regardless of the original manufacturer. (certification and additional processing also available)

Machine Base

	Changing the precision equipment base from metal to stone greatly improves precision measurements.
	Sizes are available from 300mm to 2,500mm . (larger sizes are possible as well)
	Hole processing, screw hole processing and groove processing are also available.

XY Stage

Used in transport and measurement when precise location settings and long strokes are needed.

Controls are available to precisely set dimensions and positions.

Can run in long stroke or continuous high-speed modes.

The use of an air float reduces the places where contact or friction can occur, and therefore:
-few vibrations, less sound
-less dust, maintenance-free
-very little heat generated
-very little lost motion

Specifications Example

Stroke :	1,000mm
Straightness :	1μm in the vertical direction 1μm in the horizontal direction

Suction Board

	Used in manufacturing, testing, etc., of glass substrates used for LCDs, plasma displays, etc.
	Surface precision maintained without any burrs even when scratched or scarred.
	Used to create highly-precise large-scale equipment.
	Two suction methods are available: (1) grooved and (2) pored.

(1)groove-type

(2)pore-type

Plants and Facilities

Plants and Facilities

	All work is done in-house, from the cutting of the stone to its use in manufacture.
	A wealth of the latest equipment and testing facilities allows us to produce highly-precise products.
	Work is done in rooms where temperature and humidity are maintained at fixed levels.

Circular saw sectioning	Dual-head polisher	Double-housing surface grinding machine
Machining center	Finishing room	Strictest quality controls