Last Updated： Aggregation Period:Jan 28, 2026～Feb 24, 2026
This ranking is based on the number of page views on our site.
Last Updated： Aggregation Period:Jan 28, 2026～Feb 24, 2026
This ranking is based on the number of page views on our site.
Last Updated： Aggregation Period:Jan 28, 2026～Feb 24, 2026
This ranking is based on the number of page views on our site.
1～30 item / All 38 items
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.!
![[Case Study] Seiko Instruments' Internal Grinding Machine Solves Challenges for Small Components](https://image.mono.ipros.com/public/product/image/c9a/2000776660/IPROS60407941837899963467.png?w=280&h=280)
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.
![[Case Study] Seiko Instruments' Internal Grinding Machine Solves Challenges of <Micro Holes>](https://image.mono.ipros.com/public/default/object/noimage_l.gif?w=280&h=280)
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.
![[Processing Example] Magnet General-purpose Grinding Machine CNC Internal Grinding Machine STG-3N](https://image.mono.ipros.com/public/product/image/1c7/2001032934/IPROS35134524477834360420.png?w=280&h=280)
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.
![[Processing Example] Thin-Walled Workpiece CNC Internal Grinding Machine STG-6N](https://image.mono.ipros.com/public/product/image/f1f/2001044258/IPROS34561284441042999581.jpeg?w=280&h=280)
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.
![[Processing Example] Guide Bush <Long Hole> CNC Internal Grinding Machine STG-6N](https://image.mono.ipros.com/public/product/image/cde/2001060730/IPROS14609026953562446931.png?w=280&h=280)
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.
![[Processing Example] Guide Bush <Flange on Outer Diameter> CNC Internal Grinding Machine](https://image.mono.ipros.com/public/product/image/19b/2001060736/IPROS66700777615688642181.png?w=280&h=280)
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.
A cylindrical grinding machine equipped with three types of models to accommodate various processing applications.
This machine is a high-performance internal grinding machine with high precision, high rigidity, and excellent productivity, boasting a significant market share in the home appliance and automotive parts industries, and is available in three types of models. [T-11L19] Standard model among the three types with manual workpiece loading [T-11L59] Fully automatic machine equipped with a small loader for mass processing of small to medium-sized parts [T-11L57] Fully automatic machine equipped with a large loader for mass processing of medium to large-sized parts For more details, please download the catalog.
Large CNC internal grinding machine compatible with large diameter sizes up to an inner diameter of 610mm.
The internal grinding machine "T-135N, T-1354N CNC Internal Grinding Machine" is a large chuck-type CNC internal grinding machine that accommodates large diameter sizes up to an inner diameter of 610mm (φ560 for T-1354N). The T-1354N is equipped with an extended bridge that allows the spindle unit to move 1,100mm to the left and right, making it suitable for long workpieces and taper processing. For more details, please download the catalog.
Compatible with outer diameters up to 320mm, suitable for small to medium production processing of large bearings.
The internal grinding machines "T-137N, T-177N CNC" are large CNC internal grinders designed for processing large-diameter bearings with a workpiece outer diameter of up to 320mm, featuring improved changeover capability and precision adjustment. They promise stable high-precision processing with high machine rigidity and workpiece support using a 2-shoe magnet. For more details, please download the catalog.
A simple structure internal grinding machine that supports processing with an inner diameter of φ1.5 to 170mm.
This is a versatile internal grinding machine that allows grinding with a manual machine feel. The T-11JAS is an internal grinding machine equipped with a high-rigidity spindle and a high-rigidity rotary dresser, based on the T-11JA. It is suitable for the production of various types and medium volumes of mold parts, gears, and more. The T-11JAS-4S features a 4-axis wheel head (turret) configuration, which can be optionally equipped on the above model, enabling unmanned continuous operation for high-precision processing of multiple surfaces. 【Specifications】 ○ External diameter of workpieces that can be chucked: 12–200 φmm ○ Width of workpieces that can be chucked: 125 mm ○ Internal diameter of workpieces that can be ground: 1.5–170 φmm For more details, please contact us or download the catalog.
For mass production processing of bearings, automotive parts, and compressor parts.
The internal grinding machine (centerless type) "T-11LB" allows you to choose between a shoe & magnet chuck type (T-11LB88) and a 1 shoe & 2 roller type (T-11LB78) for optimal grinding processing. It also supports external diameter processing as an option. Instead of configuring the internal and external diameter processing with different models, it can be done with a single model, improving maintainability. 【Specifications】 ［T-11LB88］ ○ Work support method: 2 shoes & magnet ○ Applicable workpiece outer diameter: φ12–150mm ○ Width of workpieces that can be ground: 5–40mm ○ R groove dimensions that can be ground: up to 6mm (when equipped with optional rotary dresser) ［T-11LB78］ ○ Work support method: 1 shoe & 2 rollers ○ Applicable workpiece outer diameter: φ6–40mm ○ Width of workpieces that can be ground: 5–25mm ○ R groove dimensions that can be ground: up to 6mm (when equipped with optional rotary dresser) For more details, please contact us or download the catalog.
Shoe Centerless Type Fully Automatic Internal Grinding Machine
The "KN-113B" is an internal grinding machine designed for the automation of mass-produced workpieces. With its unique powerful magnetic chuck, it supports the workpiece with a shoe and rotates it based on the right angle surface that has been ground on the outer diameter and end face. It is particularly suitable for internal grinding of components such as pairing, bushes, and collars, and is an ideal processing method for ensuring the concentricity of the outer diameter relative to the inner diameter. 【Features】 ■ The loading method can be selected from options such as T-type loaders, carrier methods according to the shape of the workpiece, single-arm methods, and flow-type methods, allowing for a reduction in idle time. ■ Direct dimensional gauges are also available, similar to the 113A type. *For more details, please download the PDF or contact us.
We also accommodate grinding and polishing finishes! We have both large and small honing machines available.
We would like to introduce the polishing equipment owned by Fusang Steel Pipe Co., Ltd. We have various machines including the "Internal Grinding Machine," "Cylindrical Grinding Machine," and "Honing Machine." For components where surface roughness is critical, such as bushes, cylinders, and rods, we are equipped with various facilities to accommodate polishing finishes. 【Owned Polishing Equipment】 ■ Internal Grinding Machine: G1-20N ■ Cylindrical Grinding Machine: GP-47E 265 ■ Honing Machine: VA-14R・CVA-2000R *For more details, please refer to the PDF document or feel free to contact us.
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.
At Seiko Instruments, we have provided solutions by addressing our customers' needs.
Internal grinding is a type of grinding process that involves grinding the inner surface of cylindrical workpieces. In various industries such as automotive, home appliances, and information devices, where high functionality and complex internal structures are advancing, there is a demand for small, high-precision parts. In internal grinding used for processing these parts, a balance between high processing accuracy and productivity is desired. Additionally, beyond processing accuracy, the equipment itself for internal grinding machines must also meet various requirements. [Challenges] - Balancing high processing accuracy and productivity - The equipment for internal grinding machines must also respond to various demands - Space-saving and cost-effective equipment - Consideration for the environment - Improvement of processing accuracy and efficiency *For more details, please refer to the related links or feel free to contact us.
![[Processing Example] Alumina General-purpose Grinding Machine CNC Internal Grinding Machine STG-3N](https://image.mono.ipros.com/public/product/image/fca/2001032936/IPROS37202342486733079828.png?w=280&h=280)
Introduction of a machining case where processing time was reduced by 50% and cylindricity was improved.
We would like to introduce a case study of "alumina" processing conducted by our company. In the customer's equipment, the roundness was approximately 4μm with a processing time of 2400 seconds, so we proposed a processing method to improve the roundness in about half the processing time. Compared to before implementation, we achieved a 50% reduction in processing time, a surface roughness of Ra 0.5μm or less, and a roundness of 1.0μm or less. 【Case Overview】 ■Processing dimensions: φ3.1mm×22.5mm ■Material: Alumina ■Features: Special material, long hole (L/D=6.4) ■Model: STG-3N ■Spindle: M15H-T (Max 150,000rpm) *For more details, please refer to the related links or feel free to contact us.
![[Processing Example] Die General-purpose Grinding Machine CNC Internal Grinding Machine STG-6N](https://image.mono.ipros.com/public/product/image/d7d/2001032945/IPROS78753934376347986945.png?w=280&h=280)
Achieving roundness of 0.8μm or less! Here are examples of cases where we proposed our spindles.
We would like to introduce a case study of "dice" processing that we conducted. In the customer's equipment, increasing the spindle rotation speed led to unstable precision, creating distrust in the spindle. Therefore, we proposed that our spindle maintains stable precision even at maximum rotation speed. Compared to before implementation, we achieved a 50% reduction in processing time and roundness of less than 1.0μm. 【Case Overview】 ■Processing dimensions: φ7.8mm×7mm ■Material: Carbide ■Features: Special 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.
![[Processing Example] Die <Difficult-to-Cut Material> CNC Internal Grinding Machine STG-3N](https://image.mono.ipros.com/public/product/image/adc/2001060740/IPROS72373288977953842577.png?w=280&h=280)
As a result of the introduction, processing time reduced by 80%! Introducing a case study of die processing featuring difficult-to-cut materials.
We would like to introduce a case study of the processing of "dice" that we conducted. To shorten processing time, we introduced the "STG-3N." The processing dimensions are φ5mm×3mm, and the material used is carbide nib. As a result of the introduction, processing time was reduced by 80% compared to before, and the surface roughness was less than Ra0.2μm. 【Case Overview】 ■ Processing dimensions: φ5mm×3mm ■ Material: Carbide nib ■ Features: Difficult-to-cut material ■ Model: STG-3N ■ Spindle: M11H-TM (Max 110,000rpm) *For more details, please refer to the related links or feel free to contact us.
![[Processing Example] Sleeve <Difficult-to-Cut Material> CNC Internal Surface Grinding Machine STG-3N](https://image.mono.ipros.com/public/product/image/794/2001089824/IPROS28931679305268625192.png?w=280&h=280)
We will introduce examples of sleeve processing, which has reduced processing time by 80% compared to before implementation!
We would like to introduce a case study of machining sleeves (ceramic parts). The background for the introduction was the need to reduce processing time and improve shape accuracy and surface roughness. Compared to before the introduction, processing time was reduced by 80%, and the surface roughness is below Ra0.4μm, with roundness below 0.35μm. 【Case Overview】 ■ Machining dimensions: φ12mm×8mm ■ Material: Ceramics (SiC) ■ Features: Difficult-to-machine material ■ Model: STG-3N ■ Spindle: M11H-T (Max 110,000rpm) *For more details, please refer to the related links or feel free to contact us.
![[Processing Example] Gear CNC Internal Grinding Machine STG-6N](https://image.mono.ipros.com/public/product/image/59a/2001089830/IPROS39160207823877947006.png?w=280&h=280)
We will introduce a case study of gear processing that has reduced processing time by 80% compared to before implementation!
We would like to introduce a case study of machining gears (mechanical components). The background for the introduction was the need to reduce machining time. Compared to before the introduction, machining time has been reduced by 80%, and the surface roughness has achieved a result of Ra0.1μm or less. 【Case Overview】 ■ Machining dimensions: φ40mm × 37mm ■ Material: SCM415 ■ 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.
![[Processing Example] Ring Gauge CNC Internal Grinding Machine STG-6N](https://image.mono.ipros.com/public/product/image/7e1/2001127443/IPROS45411917330551645330.png?w=280&h=280)
Improvement of product shape accuracy and reduction of cycle time are the background for the introduction! We will also introduce the effects of the implementation.
We would like to introduce a case study of the processing of "ring gauges" that we conducted. The processing dimensions are φ50mm × 20mm, and the material is SKS31. The background for the introduction was to improve product shape accuracy and reduce cycle time. After implementation, the surface roughness was reduced to Ra 0.1μm or less, and the roundness was less than 0.3μm, resulting in a 60% reduction in processing time compared to before implementation. 【Case Overview (Partial)】 ■ Background: Improvement of product shape accuracy, reduction of cycle time ■ Effects of Implementation - Surface roughness Ra 0.1μm or less - Roundness 0.3μm or less - Processing time reduced by 60% (compared to before implementation) *For more details, please refer to the related links or feel free to contact us.
Achieving high-precision processing by utilizing submicron-level repetitive measurement technology!
◇In-machine measurement function This function uses a touch probe on the tool table to measure the dimensions of the workpiece's R, taper, and straight shapes after processing within the machine. By repeating processing and measurement, it achieves machining with strict tolerances. As a feature of Seibu Electric, the combination of the machine's high positioning accuracy and high-precision touch probe enables high-precision machining. The minimum command unit for the X and Z axes of the high-precision free-form internal grinding machine SFG is 0.01μm (fully closed control). Both the work spindle and grinding wheel spindle are equipped with high-precision ceramic bearings, achieving high rigidity and high rotational accuracy. A constant temperature device is standard equipment, and special thermal countermeasures have been applied to various parts such as slides and spindles to ensure thermal stability.
