10 Internal Grinder Manufacturers in 2024
This section provides an overview for internal grinders as well as their applications and principles. Also, please take a look at the list of 10 internal grinder manufacturers and their company rankings. Here are the top-ranked internal grinder companies as of April, 2024: 1.UNITED GRINDING North America, 2.Aerospace Manufacturing & Design, 3.JAINNHER MACHINE CO., LTD..
Table of Contents
What Is an Internal Grinder?
An internal grinder is a machine designed to grind the internal surfaces of primarily cylindrical workpieces.
Grinding is a machining process that utilizes grinding wheels.
Grinding wheels consist of tough abrasive grains, such as aluminum oxide and silicon carbide, bonded together with a bonding agent.
Grinding is not suitable for rough machining due to the shallow depth of cut compared to cutting processes.
However, it is highly effective for precision machining, delivering excellent dimensional accuracy and surface finish roughness.
Uses of Internal Grinders
Internal grinders employ a small-diameter internal grinding wheel attached to a spindle referred to as a wheelhead.
The workpiece is secured using an external jaw chuck or an electromagnetic chuck attached to the spindle.
Internal grinders are broadly categorized into two types based on the grinding method: rotary workpiece type and planetary type.
In the workpiece rotary type, the wheel spindle and the main axis rotate relative to each other, while the grinding wheel on the wheel spindle oscillates back and forth as it cuts into the workpiece mounted on the main axis.
The planetary grinding method is employed when the workpiece is large or challenging to balance during rotation.
While rotating the wheel spindle, the spindle itself is given a planetary motion to grind along the internal surface.
To maintain the sharpness, accuracy, and shape of the grinding wheel, dressing is necessary when changing the wheel or after each grinding cycle.
Grinding wheel dressing involves placing the rotating grinding wheel on the diamond dresser installed on the machine.
Principles of Internal Grinders
In basic workpiece-turned internal grinders, the wheel head with the grinding wheel attached has a sliding mechanism relative to the spindle, allowing the grinding wheel to enter the hole.
Internal grinders are used to grind the internal surface of cylindrical shapes, but by adjusting the slide position, they can also grind the end face perpendicular to the shaft center of the hole.
Simultaneous grinding in a single process enables high-precision machining.
The hole's diameter and length that can be ground depend on the grinding wheel's outside diameter and the machine's stroke.
Various bore diameters can be accommodated by selecting a grinding wheel that matches the bore diameter.
However, as bore deflection tends to be higher due to the wheel spindle's small size, it is advisable to choose a grinding wheel with the largest possible diameter for the bore and mount it on the wheel spindle head using a short-shafted wheel spindle.
The machine can also handle stepped bore diameters, and coaxiality of the bore diameter can be achieved in a single process, ensuring high precision. Taper grinding can also be performed by angling the spindle.
When grinding workpieces with a grinding wheel, a low peripheral speed can cause abrasive grains to detach along with the bonding agent.
Typically, the wheel spindle head rotates at 2000 to 3000 rpm under standard grinding conditions to achieve the desired peripheral velocity due to the grinding wheel's small diameter.
The spindle workpiece speed is set to maintain a peripheral speed of about 35 to 45 m/min for the grinding surface.
List of 10 Internal Grinder Manufacturers
*Including some distributors, etc.
Sort by Features
- Default
- Company Size: largest first
- Year Founded: oldest first
- Year Founded: earliest first
Sort by Area
- United States of America
- India
- Japan
- Taiwan
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JTET Machine System
KIH80Ⅱ
Manufacturer Overview
JTET Machine System, established in 1961 and headquartered in Osaka, Japan, is a manufacturer and supplier of machine tools, FA systems, and precision apparatuses. The company's product portfolio includes FA systems, drive shafts, machine tool grinders, precision mechanical equipment, and intermediate shafts for vehicles. These products find applications in various industries, including the automobile, information technology, home appliances, space technology, and medical devices. The company is ISO 14001 certified and has offices in South Korea, China, Thailand, and Mexico, establishing a global network.
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Toyo Advanced Technologies
Internal Grinding Machines
Manufacturer Overview
Toyo Advanced Technologies Co., Ltd., established in 1950, is a Japanese manufacturer and supplier headquartered in Minami-ku, Hiroshima, specializing in machinery and hard coating solutions. The company offers various computerized numerical control (CNC) internal and external grinding machines as well as gear and multi-profile grinding machines. Additionally, it provides CNC honing machines, cylinder block bore finishers, multi-wire saws for power semiconductors, and scroll cutting machines. These machines find applications in various industries, including automobile, bearing, and electric household appliance. The company also offers hard coating solutions such as chemical vapor deposition (CVD), physical vapor deposition (PVD), and diamond-like carbon (DLC) coatings.
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JAINNHER MACHINE CO., LTD.
Internal Grinding Machine
Manufacturer Overview
As a high-precision grinding machine manufacturer in Taiwan since 1982, Jainnher Machine owns more than 40 years of experience and has developed a complete machine series to fulfill various grinding requests. Our machine series including: Centerless, Cylindrical, Internal, Plunge, Angular, Center hole, Double spindle (ID & OD), Vertical and Thread grinding machine. Grinding machines are widely used in precision aerospace and other transportation industries, cutting tools, medical parts, mold & machining parts, consumer goods. We have successful cases of customized solutions with different industries. The company holds ISO 9001:2015 certification and CE/UKCA certifications , not only to meet customer requirements for quality assurance but also to enhance customer confidence and satisfaction in our grinding machine products Jainnher has global service net to conquer the language and time zone difference. And we’re able to provide the fully technical support, field training which can benefit our dealers communicate with their customers.
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Okamoto Machine Tool Works,Ltd.
Internal Grinding Machine
Manufacturer Overview
Okamoto has been a manufacturer of Total Abrasive Process Machine in Japan since 1926. The company offers a range of Griding machines, including Precision Cylindrical, Double Column Type, Specialized, Ultra Precision Form, and CNC Precision Surface Grinding Machines, as well as Semiconductor equipment devices such as polishing, lapping, and slicing machines, along with special consumer-designed devices. These products provide abrasive processing for the automotive, IT, digital consumer electronics, and semiconductor industries.
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PALMARY MACHINERY CO., LTD.
INTERNAL GRINDER
Manufacturer Overview
Palmary Machinery Co., Ltd., established in 1998 and based in Taichung, Taiwan, is a manufacturer of precision grinding machines. Its product range encompasses centerless grinders, cylindrical grinders, internal grinders, vertical grinders, and surface grinders, serving a diverse array of industries such as automotive, aerospace, mechanical components, and more. The company holds CE certification and ISO9001:2015 certification, highlighting its adherence to quality standards. The company has also achieved several accolades, including the Gold Medal Award at the 89th Poland Mach-Tool Show 2017 and the 14th National Brand Yushan Award 2017.
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Okuma Corporation
Internal Grinder
Manufacturer Overview
Okuma Corporation is a Japanese machine tool manufacturer that was founded in 1898 as the Okuma Noodle Machine Company before rebranding in 1918. Based in Oguchi, Aichi Prefecture, the company produces a wide selection of machines including CNC lathes, multi-axis machining centers, grinders, and multitasking machines. It also offers software and automation solutions that can be customized to improve the performance and functionality of its products. Okuma Corp. maintains a global support network via 28 subsidiaries located throughout Asia, the Americas, Europe, and the Pacific regions.
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I Machine Tools Corp.
Internal Grinding Machines
Manufacturer Overview
I Machine Tools Corp. is a manufacturer and exporter of various kinds of CNC machines and machine tools based in Taichung City, Taiwan. The company specializes in the production of metal cutting machines, CNC milling machines, grinding machines, and machining centers. I Machine Tools Corp. also offers various Vertical and Horizontal CNC Turning Lathe such as High-Speed Turning Lathe and CNC Swiss Type Turning Lathe designed for hard materials machining.
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PITRODA UTILITY INDUSTRIES
Internal Grinding Machine
Company Overview
Pitroda Utility Industries, established in 1960 and headquartered in Wadhwan, India, is a manufacturer and supplier specializing in the field of grinding technologies. The company offers a wide range of grinding machines catering to various industrial needs, which include hydraulic cylindrical grinding machines, internal bore grinding machines, SPM cylindrical grinding machines, CNC/PLC cylindrical grinding machines, and more. Its products are applicable in various industries, including metal product manufacturing, automotive, defense, pharmaceutical, agriculture, and more.
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Internal Grinder Manufacturer Ranking
*Including some distributors, etc.Ranking as of April 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | UNITED GRINDING North America |
25.0%
|
| 2 | Aerospace Manufacturing & Design |
25.0%
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| 3 | JAINNHER MACHINE CO., LTD. |
25.0%
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| 4 | PALMARY MACHINERY CO., LTD. |
25.0%
|
Derivation Method
The ranking is calculated based on the click share within the internal grinder page as of April 2024. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
- Okuma Corporation: 3,802
- JTET Machine System: 2,547
- Toyo Advanced Technologies: 679
Newly Established Company
- JAINNHER MACHINE CO., LTD.: 1982 (42 years ago)
- JTET Machine System: 1961 (63 years ago)
- PITRODA UTILITY INDUSTRIES: 1960 (64 years ago)
Company with a History
- Okamoto Machine Tool Works,Ltd.: 1926 (98 years ago)
- PITRODA UTILITY INDUSTRIES: 1960 (64 years ago)
- JTET Machine System: 1961 (63 years ago)
Internal Grinder Manufacturers in United States
*Including some distributors, etc.
Global Distribution of Internal Grinder Manufacturers by Country
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
Japan
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4 | 44.4% |
United States of America
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2 | 22.2% |
Taiwan
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2 | 22.2% |
India
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1 | 11.1% |
List of Internal Grinder Products
1 product is listed.
JTET Machine System
Internal grinder
"High -precision, high -speed grinding, and mechanical miniaturization" required for the inner grinding of bearings are realized. The workhead is "...
