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Grinding machine Product List

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Fully Automatic Internal Grinding Machine 'SIG02α II'

Fully Automatic Internal Grinding Machine 'SIG02α II'

Successfully achieved significant miniaturization of the main unit! It widely accommodates various spindle types with an outer diameter of up to φ62.

The "SIG02α II" is an evolved fully automatic internal grinding machine that inherits the SIG series, boasting a sales record of over 2,000 units. In addition to the well-established 2-roller 1-shoe spindle, a 2-shoe 1-magnet spindle is also available. It features a high-rigidity static pressure guide surface on the table guide. Moreover, it has successfully achieved significant miniaturization of the machine body, allowing it to accommodate workpiece outer diameters ranging from φ8mm to φ40mm and φ30mm to φ62mm, depending on the spindle type. 【Features】 ■ Centerless type for bearing processing ■ High-rigidity static pressure guide surface on the table guide ■ Capable of handling workpiece outer diameters from φ8mm to φ40mm and φ30mm to φ62mm ■ Significant miniaturization of the machine body achieved ■ Body dimensions: 1,240mm(W) × 1,220mm(D) × 1,800mm(H) *For more details, please refer to the PDF document or feel free to contact us.

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Internal Grinding Machine SIG03α

Internal Grinding Machine SIG03α

Bearing Grinding Machine Series

This is the introduction of a high-precision, high-efficiency internal grinding machine developed based on the tradition and experience since the founding of Seiko Instruments Inc.!

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Universal CNC Internal Grinding Machine STG-6N

Universal CNC Internal Grinding Machine STG-6N

Universal high-precision CNC internal grinding machine

A compact universal internal grinding machine that achieves precision and high-efficiency processing for a wide variety of products with an outer diameter of up to 160mm. ● Space-saving design Main body size: 1,600(W) × 1,615(D) × 1,320(H) mm ● Compact size design tailored to factories that prioritize equipment size and corresponding workpiece size ● Standard equipped with a high-output, high-rigidity in-house spindle (SSPG series) that contributes to improved productivity through high-precision and high-efficiency processing ● Chuck size: 6 inches

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Fully automatic high-precision internal grinding machine 'SIG-2S II/SIG-3S II'

Fully automatic high-precision internal grinding machine 'SIG-2S II/SIG-3S II'

A grinding machine that allows for versatile grinding with multiple grinding stone spindle axes, featuring a diaphragm chuck spindle.

The "SIG-2S II/SIG-3S II" is a high-precision internal grinding machine characterized by multiple grinding spindle axes. With 1 chuck and 2 spindles, it enables versatile grinding. The processing specification features a diaphragm chuck spindle. It can be used for machining automotive parts such as gasoline and diesel injection nozzles and pumps. 【Features】 ■ For automotive parts machining ■ Versatile grinding with 1 chuck and 2 spindles ■ Diaphragm chuck spindle ■ Main body dimensions ・SIG-2S II: 2,100mm(W)×1,600mm(D)×1,950mm(H) ・SIG-3S II: 2,900mm(W)×3,900mm(D)×2,300mm(H) *For more details, please refer to the PDF document or feel free to contact us.

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Improvement of production efficiency through reduced processing time - CNC internal grinding machine *Test processing available

Improvement of production efficiency through reduced processing time - CNC internal grinding machine *Test processing available

We will introduce a case where the introduction of our internal grinding machine has achieved a reduction in processing time and an improvement in accuracy!

The "STG-6N" is a CNC internal grinding machine equipped with a standard 6-inch scroll chuck. It features an easy-to-use human interface and a space-saving design. It is equipped with a proprietary low-vibration, high-precision high-frequency spindle. 【Examples of improved production efficiency through reduced processing time】 <Gear> ■Inner diameter size: φ40×37mm ■Material: SCM415 ■Processing time: 80% reduction ■Processing accuracy: Improved (Surface roughness Ra 0.1μm or less) <Ring Gauge> ■Inner diameter size: φ50×20mm ■Material: SKS31 ■Processing time: 56% reduction ■Processing accuracy: Improved (Roundness 0.3μm or less / Surface roughness Ra 0.1μm or less) <Collet> ■Inner diameter size: φ30×20mm ■Material: Carbide ■Processing time: 70% reduction ■Processing accuracy: Improved (Surface roughness Ra 0.1μm or less) *For more details on various examples, please contact us directly. *For more information on the internal grinding machine, please refer to the PDF document or feel free to contact us.

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New Product: Compact Universal Internal Grinding Machine 'STG-3NX'

New Product: Compact Universal Internal Grinding Machine 'STG-3NX'

Compact universal internal grinding machine 'STG-3NX' that achieves high precision and high productivity. *Test processing available.

The product, the compact universal internal grinding machine "STG-3NX," is a CNC internal grinding machine that enables high-precision and high-efficiency processing despite its compact size. Since its launch in 2009, the "STG-3NX" has received high praise as a successor model to the small internal grinding machine "STG-3N," which is equipped with a 3-inch/4-inch chuck. It retains the advantages of space-saving, high rigidity, and low center of gravity structure while expanding the internal space by extending the stroke of the spindle base table, thereby improving workpiece loading and unloading as well as in-machine measurement operations. Additionally, it is equipped with a high-output, high-rigidity self-developed high-frequency spindle "H Series," contributing to the improvement of customer productivity through high-precision and high-efficiency processing. 【Features】 ■ The stroke of the spindle base table is extended by 33%, expanding the internal space. ■ Achieves high-precision and high-efficiency processing. ■ Improved operability based on ergonomic layout. ■ Equipped with FANUC NC device (FIELD system compatible). *To evaluate the capabilities of the STG-3NX, we offer test processing of specified workpieces free of charge in principle. Please contact us through the site or form below.

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There is a demand for high-precision, high-efficiency, and space-saving grinding machines.

There is a demand for high-precision, high-efficiency, and space-saving grinding machines.

It is possible to alleviate anxiety! Development of grinding machines that meet your needs is underway.

There are various types of grinding machines. In recent years, as products have become more complex and compact, the components required have also needed to be smaller and more precise, leading to a demand for high precision and efficiency in the grinding machines used to process them. Additionally, from the perspective of environmental and space efficiency, it is necessary to reduce the footprint of the equipment itself without compromising performance. If you choose a domestic manufacturer that offers comprehensive support from before to after installation, you can easily consult them and alleviate any concerns. 【Types of Grinding Machines】 ■ Surface Grinding Machine ■ Internal Grinding Machine ■ Cylindrical Grinding Machine ■ Centerless Grinding Machine ■ Tool Grinding Machine *For more details, please refer to the related links or feel free to contact us.

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Features of Seiko Instruments' internal grinding machine

Features of Seiko Instruments' internal grinding machine

Achieve equipment sizes that match the size of the workpiece! It is highly versatile and has excellent scalability.

At Seiko Instruments, we offer a space-saving internal grinding machine with excellent machining accuracy. We have achieved a machine size that fits small workpieces without sacrificing the operability and usability for the operators using the equipment. The machining accuracy is realized by adopting a high-performance high-frequency spindle developed in-house. Additionally, the main body of the equipment is highly versatile and has excellent expandability. 【Features】 ■ Space-saving with excellent machining accuracy ■ Does not sacrifice the operability and usability for the operators using the equipment ■ Achieves a machine size that fits small workpieces ■ Adopts a high-performance high-frequency spindle developed in-house ■ Main body of the equipment: highly versatile and excellent expandability *For more details, please refer to the related links or feel free to contact us.

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[Case Study] Seiko Instruments' Internal Grinding Machine Solves Challenges for Small Components

[Case Study] Seiko Instruments' Internal Grinding Machine Solves Challenges for Small Components

Introducing a case where the adoption of a high-frequency spindle resolved difficulties in ensuring precision.

We would like to introduce a case where Seiko Instruments Inc. resolved challenges through test processing. For small parts, such as components for medical devices, where coaxiality between the inner and outer diameters is required, it is generally difficult to ensure precision using commonly employed tool clamping methods like air chucks, diaphragm chucks, and magnetic chucks. Our internal grinding machine addresses these challenges by adopting a roll spindle mechanism used in bearing processing and our self-developed high-frequency spindle. [Case Overview] ■ Issues - Difficulty in ensuring precision for small parts requiring coaxiality between the inner and outer diameters. ■ Results - Achieved automatic supply of parts via a parts feeder, automatic measurement of workpieces after processing, and automatic discharge. - Capable of responding to demands not only for processing precision and efficiency but also for overall productivity improvement. *For more details, please refer to the related links or feel free to contact us.

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[Case Study] Seiko Instruments' Internal Grinding Machine Solves Challenges of <Micro Holes>

[Case Study] Seiko Instruments' Internal Grinding Machine Solves Challenges of <Micro Holes>

Introducing examples of problem-solving achieved through high-speed spindles and machining know-how cultivated over many years of experience.

We would like to introduce a case where Seiko Instruments Inc. resolved challenges through test processing. When performing internal grinding of micro-holes, the rigidity of the quill supporting the grinding wheel becomes lower, resulting in greater deflection of the quill, making it very difficult to ensure dimensional and shape accuracy. With our internal grinding machine, we can perform high-efficiency internal grinding of extremely small diameters down to a minimum of 0.3mm, thanks to our self-developed high-speed spindle with high precision and the processing know-how cultivated over many years of experience. [Case Overview] ■Challenges - Ensuring dimensional and shape accuracy ■Results - High-efficiency internal grinding of extremely small diameters down to a minimum of 0.3mm is possible. *For more details, please refer to the related links or feel free to contact us.

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[Processing Example] Magnet General-purpose Grinding Machine CNC Internal Grinding Machine STG-3N

[Processing Example] Magnet General-purpose Grinding Machine CNC Internal Grinding Machine STG-3N

Shortening Cycle Time! Introducing Examples of Processing Neodymium Magnets

We would like to introduce a case study of "magnet" processing that we conducted. Our goal was to improve processing accuracy and achieve in-house production of workpieces that our customers had been outsourcing. Compared to before implementation, processing time was reduced by 65%, achieving a surface roughness of Ra 1.5μm or less and roundness of 1.5μm or less. 【Case Overview】 ■ Processing dimensions: φ4mm × 26.4mm ■ Material: Neodymium magnet ■ Features: Special material, long hole (L/D = 6.6) ■ Model: STG-3N ■ Spindle: M8H-T (Max 80,000rpm) *For more details, please refer to the related links or feel free to contact us.

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[Processing Example] Thin-Walled Workpiece CNC Internal Grinding Machine STG-6N

[Processing Example] Thin-Walled Workpiece CNC Internal Grinding Machine STG-6N

Applying the technology cultivated in mass production of precision parts to general-purpose internal grinding machines! Introducing our processing examples.

We would like to introduce our processing case that has achieved high-precision machining of thin-walled workpieces. Workpieces that require internal grinding often demand not only roundness and surface roughness but also runout (coaxiality) relative to the outer diameter. This is particularly challenging for thin-walled workpieces, where deformation due to gripping becomes an issue. To address this, we have equipped our CNC internal grinding machine STG-6N, which we manufacture and sell, with a newly developed 2-roll 1-shoe spindle, enabling high-precision machining of thin-walled workpieces. 【Case Overview】 ■Challenges - Susceptible to deformation due to gripping ■Results - Uniform wall thickness relative to the reference workpiece's outer diameter - Dramatic improvement in coaxiality of the inner diameter relative to the outer diameter after machining - Reduced deformation of the workpiece due to gripping, leading to expected improvements in roundness *For more details, please refer to the PDF document or feel free to contact us.

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[Processing Example] Guide Bush <Long Hole> CNC Internal Grinding Machine STG-6N

[Processing Example] Guide Bush <Long Hole> CNC Internal Grinding Machine STG-6N

Compared to before the introduction, processing time reduced by 35%! Introducing a case study of mold processing featuring long holes.

We would like to introduce a processing case of "guide bushes" that we conducted. As a background for the introduction, we proposed improving productivity by reducing processing time. The processing dimensions are φ24×67mm. The material is SUJ2, and the feature is a long hole. As a result of the introduction, we achieved a 35% reduction in processing time, a surface roughness of Ra0.4μm or less, and roundness of 1.5μm or less. 【Case Overview】 ■ Processing dimensions: φ24×67mm ■ Material: SUJ2 ■ Feature: Long hole ■ Model: STG-6N ■ Spindle: SSPG-045 T100 (Max 45,000rpm) *For more details, please refer to the related links or feel free to contact us.

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  • Processing Contract
  • Mold Design

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[Processing Example] Guide Bush <Flange on Outer Diameter> CNC Internal Grinding Machine

[Processing Example] Guide Bush <Flange on Outer Diameter> CNC Internal Grinding Machine

Surface roughness should be below Ra0.2μm! Here are examples of machining guide bushes made of SUJ2 material.

We would like to introduce a processing example of "guide bushes" that we conducted. The model used is STG-6N. The processing dimensions are φ13mm×25mm, and the material is SUJ2. The background for the introduction is the improvement of productivity through reduced processing time. As a result of the introduction, the surface roughness was achieved at Ra0.2μm or below, and the roundness was realized at 0.8μm or below. 【Case Overview】 ■ Processing dimensions: φ13mm×25mm ■ Material: SUJ2 ■ Features: Flange on the outer diameter ■ Model: STG-6N ■ Spindle: SSPG-045 T100 (Max 45,000rpm) *For more details, please refer to the related links or feel free to contact us.

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Seiko's internal grinding machine series

Seiko's internal grinding machine series

Inherit quality within.

Based on the technology cultivated in watch manufacturing, we propose various grinding machines that achieve precision and high-speed processing. With expert craftsmanship, we provide compact and energy-efficient internal grinding machines that are friendly to the factory environment.

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