ID or OD Grinding Process

Grinding Services

ID and OD grinding are frequently discussed as though they were two different types of grinding services. However, both have different concepts and applications. You will learn everything you need to know about the ID and OD grinding services in this article.

Grinding process

Grinding is a process of removing metals using abrasives bonded together, forming a rotating wheel. When abrasive particles that are moving come into contact with the workpiece, it acts as small cutting tools, cutting a small chip off the workpiece with each particle. Abrasive grinding wheels are expected to remove material through rubbing, yet, the procedure is just a

cutting action like lathe turning, milling, and drilling. All these machining processes could be performed at precision machine shops.

ID Grinding 

Grinding Services

ID grinding is also called inner diameter grinding, inside diameter grinding, bore grinding, or internal grinding. It is the technique of precisely removing material from the inner diameter of any conical or cylindrical workpiece.


ID Grinder

An ID grinder is also known as an “internal grinding machine.” It can grind cutting tools, gear parts, bearings, hydraulic components, and non-round discs.


ID Grinder is used in the following applications:

  • Military tank parts
  • In automotive engines, hydraulic tappets are used.
  • roller rocker arms
  • Bearings

OD Grinding

Grinding ServicesIt’s not simply about shaping OD, the outside diameter of a piece when it comes to OD grinding services. It is a kind of cylindrical grinding and necessitates the presence of a central rotational axis in the piece being ground. OD grinding takes place on the workpiece’s exterior surface between both the centers — and this is a crucial difference.

OD Grinder

An OD grinder performs precisely as its name suggests; it grinds a cylindrical workpiece’s outer diameter.


OD Grinder is used in the following applications:

  • Hydraulic components
  • Transmission components
  • Axles
  • Crankshafts
  • Camshafts

The Advantages of OD Grinding

OD grinding is a simple procedure unless you require varied diameters over a length or need an incredibly high material removal rate; in such a case, you’ll need a creep-feed grinder. It’s comparable to through-feed centerless grinding as both are designed to improve an object’s outside.

However, OD grinding has a significant benefit in that it requires you to locate the true center of a circular item. Users could make something flawless out of something that’s not round. Of course, there’s a caveat; the grinding process removes material so that the piece will become smaller.

OD grinding, unlike centerless grinding, allows you to eliminate undesirable geometry and restore precise circularity to a part. That implies the procedure could be utilized to create or restore roundness, resolving difficulties like concentricity, ovalness, and various circular defects.

Cylindrical Grinder

A centered OD grinder is also known as a cylindrical grinder because the workpiece is fixed between cone-shaped centers and rotated by a drive system. Although our understanding of a cylindrical grinder is confined to centered grinding, there are several different cylindrical grinder types, such as a system with a single set of the spindle to grind various diameters.

Universal Grinder

ID and OD precision grinding are done with a universal grinder. These systems are programmed to carry out each set of actions sequentially. Universal grinders are typically used in tool rooms and are best suited for low-volume pieces. For high-volume applications, separate OD and ID grinders are required.

It is one thing to understand how various types of grinders work, but it’s quite another to be equipped to design a precision grinding procedure that satisfies customers’ specific requirements.

ID/OD Grinding Applications

The ID/OD grinding procedure can ensure a fine and high-quality finishing on the following applications.

  • Automobile bushings
  • Shives
  • Gear bores
  • Cams

Elements involved in the Designing of ID or OD Grinding Process

To design the best grinding process, many critical factors must be considered. One of the very first factors to be considered is project capacity. An application used to grind ten pieces annually at precision machine shops requires a different approach than one used to grind thousands of components per hour.

Another essential factor to consider is the material; hardened steel must be treated differently than soft brass.

These considerations influence the stiffness and rigidity of the workpiece by determining the fixturing to use. The faster a part could be ground, the harder it is kept in place.

Part tolerances also influence process design. Specific sensitive applications may have ID tolerances between +/- 60 millionths of an inch, necessitating extreme precision.

The level of automation against the quantity of labor involved should be considered. The procedure for a project of 10-piece annually can easily handle hand feeding, whereas the project processing thousands of pieces per hour necessitates a higher automation level, such as:

  • Infeed conveyors
  • Loading and unloading systems in the gantry style
  • Robotics
  • Post-process gages

Designing a precision grinding process is complex and necessitates a thorough understanding of both precision or centerless grinding and the part being ground.

Do I Need OD or ID Grinding?

There are various factors influencing the results you obtain when you perform OD or ID grinding at precision machine shops, just as there are with other centerless grinding procedures. For example, the surface produced will be influenced by:

  • The material hardness of the workpiece
  • Grain fineness and wheel type
  • The wheel’s condition (e.g., minimal clogging, properly dressed)
  • Machine rigidity
  • Feed rate
  • Lubricant quality

The right supplier can help you understand your piece requirements and decide if OD or ID grinding is a perfect fit for your project. Both ID or OD grinding can be done at precision machine shops.

Contact Us For Best Grinding Services

With 30 years of experience and professional expertise in the manufacturing industry, O’Hare Precision Metals, LLC has established itself as a leading company. We believe in our ability to handle your precision grinding needs. Our goal isn’t just to supply grinding services that fit a customer’s needs; we want to assist customers to boost productivity, dependability, and precision while improving efficiency.

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Contact Info

O’hare Precision Metals specializes in centerless grinding services and provide precision ground bar materials, focusing high tolerance and offering essential machining services.
O’hare Precision Metals, LLC
2404 W. Hamilton Rd. Arlington Heights, IL 60005
Tel.No. (847) 640-6050
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