Advantages of OD Grinding
Outside diameter (OD) grinding is a highly effective and often-used process for metalworking jobs — and for many reasons. If a project you're working on requires strict precision and near-perfect part roundness, you can achieve this easily with an OD grinder. Learn more about this grinding technique, including common OD grinding applications and the main benefits of OD grinding.
What Is OD Grinding?
OD grinding is a subset of cylindrical grinding that finishes a part's outside diameter. Cylindrical grinding is a process typically used at the end of a project that forms a finished surface on a cylindrical part's interior, exterior or both. With cylindrical grinding, the object and grinding wheel continually rotate with respect to each other.
During OD grinding, the part being finished spins on a central rotational axis. OD grinding uses two end pieces to hold the part steady, with it rotating around its true center axis. The grinding wheel also rotates, often while traveling the length of the component.
Both the part and wheel move in the same direction, but when they make contact, the direction is reversed, and they begin moving opposite to each other. This technique lessens the chance of a jam, helps both objects travel smoothly and prevents the grinding wheel from making any significant cuts within the material being ground.
Various components of an OD grinder can be offset during the process to ensure different results, such as:
- The grinding wheel: Offsetting the grinding wheel lets you grind certain angles onto a part.
- The headstock: If you're looking to create a more pronounced taper on a part, offsetting the grinder's headstock will help you achieve this.
- The upper table: Offsetting the upper table facilitates extremely accurate and gradual taper grinding, where one end of the part becomes smaller than the other end.
What Is an OD Grinder Used For?
OD grinders are used for finishing the exteriors of objects like crankshafts, bearings, axles and hydraulic and transmission components. OD grinding is a go-to choice when metalworking jobs require close attention to detail, accuracy and precision. You can perform numerous grinding jobs using an OD grinder. Here are the three most common uses:
- Transverse cylindrical grinding: Transverse grinding adds transverse motion across the part being finished, which is relative to the grinding wheel and moves perpendicular to the plane of wheel rotation. This type is essentially the opposite of plunge grinding, described below.
- Plunge grinding: During plunge grinding, the wheel continuously makes contact with one section of the part instead of traveling up and down its length.
- Form grinding: The wheel is the same shape as the finished part with this type of grinding, allowing you to grind non-standard forms.
Benefits and Advantages of OD Grinding
While OD grinding has numerous benefits, one significant advantage is that you can find an object's true center using this process, which allows you to create a perfectly circular shape. This ability is especially crucial for industries and applications that call for precise parts.
OD grinding can also remove existing geometric issues on a part and bring it back to the level of accuracy and roundness you need. This feature makes it an excellent option for addressing metal component defects so you can spend less time creating entirely new parts.
OD grinders come in several configurations to best match your project needs. For example, you could use a computer-numerical control (CNC) model or a manual machine. Manual grinders are often better for accomplishing custom material cuts, while automated models let you complete more work with less labor.
You can easily complete large, complex projects with a suitable grinding machine and metalworking partner to take care of the process. At Hard Chrome Specialists, our cylindrical grinding machine can take on projects as big as 25 inches in diameter and 159 inches long. Our machine can also handle a weight capacity of up to 8,000 pounds. With these capabilities, you can be confident your projects will turn out just as intended, whether small or large.
What Industries Is OD Grinding Used For?
Precise engineering and adherence to strict measurements are essential aspects of many different industries and their machine production processes. Here are some common industries and applications that use OD grinding to meet these standards:
- Aerospace: Aerospace components must withstand extreme environments, including significant vibration, very high and low temperatures and high altitudes. They also have small tolerances and must have precise finishes. OD grinding is the preferred way to produce elements like turbine shafts and rings, tensile specimens, valves and spools that meet these requirements. Precision grinding ensures components used in aerospace engineering meet the required specifications for temperature stability, safety, flexibility and rigidity.
- Machine tooling: Manufacturers use OD grinders to make parts like pistons, roller bearings, spindles and ball screws. OD grinding is also used to create components such as drill points, ring gages, profile inserts and reamers for the machine tooling and die and mold sectors.
- Automotive: Within the automotive industry, manufacturers use OD grinding to shape parts like brake cylinders and pistons, gear shafts, connecting rods and steering pistons. The precise finishes they can achieve with this method offer a perfect fit for mated automotive components like gears. Part concentricity is crucial for many vehicle elements, and OD grinders are ideal for accomplishing the required concentricity level.
- Defense: Like the aerospace sector, components used for the military and defense industries must meet precise specifications and hold up to rigorous use and harsh settings. Some elements that benefit from OD grinding are missile shells, gun tripods and bolt carrier groups.
- Energy: Machines in the energy industry — such as wind turbines and hydroelectric parts — require micron-level precision to generate power and get it safely to users. OD grinding can help create perfect parts such as rotor shafts, compressor parts and motor components.
Contact Hard Chrome Specialists Today for OD Grinding Services
When you're looking for expert OD cylindrical grinding services for parts of all sizes, trust Hard Chrome Specialists to handle your project. We are a family-owned and -operated business specializing in hard chrome plating, electroless nickel plating and cylindrical grinding solutions. Our in-house metalworking capabilities enable us to offer quick turnaround times, and we are ISO 9001:2015 certified to ensure the highest quality results on every job.
Contact us today to begin your next OD grinding project and get the precision, fast response times and quality workmanship you need.
How Can You Use Cylindrical Grinders?
Do you manufacture metal parts? If your business produces metal objects with a central axis of rotation, you can use cylindrical grinding to ensure they have a smooth finish on the exterior and interior. This process is an effective way to smooth down several of the same types of objects.
Below, you’ll find more information about what cylindrical grinding is used for so you can determine whether it’s an effective process for your company’s metalworking needs.
What Is Cylindrical Grinding?
When you want to achieve a fine finish on a metallic surface, you can use cylindrical grinding. Most commonly, cylindrical grinding is used for grinding pieces with a central axis of rotation, like rods and cylinders. This process involves using a cylindrical grinder, which is a type of machinery categorized by rotation style and wheel device.
There are several kinds of cylindrical grinders, each one serving different purposes. However, all of them accomplish a similar goal — to remove tiny bits of excess metal from aluminum, steel and other metal objects as the final step in a project. As a result, you have a smooth piece of metal for your specific application.
How the Cylindrical Grinding Process Works
During the cylindrical grinding process, the machinist sets the piece of metal between two centers, called head and tail stocks. When the machinist operates the machine, the cylinder rotates in one direction. Then, the grinding wheel moves in the opposite direction at a different speed to start grinding.
While that’s happening, the wheelhead, which is attached to the grinding wheel, moves the wheel in varying motions toward and away from the metal piece to achieve the smoothest finish. Sometimes, the table beneath the object shifts back and forth laterally at the same time. As each part works, they’ll move along the surface of the object to create a perfect finish free of any crevices or scrapes.
Keep in mind that because various types of cylindrical grinding exist, the above process may look slightly different based on what style you use to smooth your metal products.
Most Common Types of Cylindrical Grinding
Depending on the nature of your application, you may need to use different kinds of cylindrical grinding machines. This equipment can accomplish numerous styles of grinding — outside diameter (OD) grinding, inside diameter (ID) grinding, plunge grinding, centerless grinding and creep feed grinding.
Here’s a closer look at each cylindrical grinding type to help you narrow down which one suits your business’s needs best:
- OD grinding: An OD grinding machine uses centers to rotate the object as it moves through the grinding wheel. As previously described, OD grinding involves the metal piece moving in the opposite direction of the grinding wheel. This type of grinding is strictly for exterior grinding purposes.
- ID grinding: ID grinding is the opposite of OD grinding, as it aims to finish an object’s interior. Therefore, the grinding wheel goes inside of the object. A collet, a kind of chuck, keeps the metal piece in place while simultaneously rotating it in the opposite direction to perform the grinding.
- Plunge grinding: A plunge grinding machine is used for a subset of OD grinding. Plunge cylindrical grinding concentrates on one part of the metal piece, as the grinding wheel continuously makes contact with a single area, rather than moving back and forth or up and down.
- Centerless grinding: When performing centerless grinding, machinists don’t need to secure the metal piece with a pair of centers or a collet. A centerless grinding machine uses a regulating wheel across from the grinding wheel. The object is set at an angle against the regulating wheel.
- Creep feed grinding: Instead of creating a seamless finish across the entire object, creep feed grinding removes a piece of the metal in one pass. This style uses a grinding wheel below a diamond dressing roller, which both operate in different directions. A creep feed grinding machine is best to use when you need to cut down your manufacturing time.
As you can see, choosing the appropriate cylindrical grinding style will depend on your application.
Typically, OD grinding is the guide style for cylindrical grinding, which you can use with other types when necessary. If you need to smooth the interior of a rod, you’ll likely need to use ID grinding in combination with OD grinding to get a completely smooth object inside and out. However, other uses may call for centerless grinding only.
With the knowledge of the basics of each grinding process, you’re better equipped to make the correct decision for your metalworking needs.
Common Industrial Uses for Cylindrical Grinders
While cylindrical grinding can work wonders for cylindrical objects, you can also use it to grind metal pieces in other shapes. So long as the object has a central axis of rotation, you can use cylindrical grinding to achieve a flawless finish. The main goal of cylindrical grinders is to create a surface with little to no roughness.
There’s a broad range of industrial applications for cylindrical grinding. Whether you need a smooth finish on rods, pistons, shafts, bearings or other kinds of objects, you can likely use cylindrical grinding to accomplish your goals. The most common industries that use cylindrical grinders are aircraft, plumbing, electrical and automotive.
Mainly, numerous industries use cylindrical grinder machines because they’re accurate, work 24/7 and allow for repeatability. In other words, you can create large batches of metal objects with smooth finishes around the clock. If you produce many of the same kinds of objects, you can ensure each one is as alike as possible when you use cylindrical grinding. This ease of production explains why cylindrical grinding is so popular.
Contact Hard Chrome Specialists for Reliable Outside Diameter Grinding Today
At Hard Chrome Specialists, we have decades of experience in the metalwork industry. From welding services to custom fabrication to cylindrical grinding services, we can help you achieve your metal manufacturing needs. Let us help you tackle your company’s metalworking needs with our quality services.
When it comes to cylindrical grinding, we exclusively use OD grinding to ensure the most precise finishes for various applications. Currently, we use an OD grinder that can accommodate shafts up to 25 inches in diameter and 159 inches long. The machine’s weight capacity is 8,000 pounds, so we can create a seamless finish for nearly any kind of metal you need us to process.
To learn more about our OD grinding process, contact us through our online contact form and our team will reach out as soon as possible.