Centerless grinder is a kind of grinding process which utilizes abrasive contact cutting to eliminate material from a work piece without contacting surface in the process. The grinding wheel includes a rotating diamond and two or more work edges, attached with spindles on the opposite sides of the diamond. The grinding wheel passes the work piece through the center diamond and grinds away the work piece until the diamond stops abruptly. This sudden stop results in a radial grind, the only type of grinding that utilizes contact force. There are several types of grinding wheels in use; however, the most familiar of them all is the one with the flat surface and the end portion having a rounded surface. In other words, all kinds of grinding wheels are stationary and most of the time, they are attached to the lathe along with the work piece for grinding.
In any event, a centerless grinder is a self-contained machine. It does not require any external support like stand and supports to work. There are two kinds of this kind of machine: the rotary wheel type and the grinding wheel type. The rotary type is generally a bigger and bulkier machine compared to the other type. This type is attached to the lathe and is often referred to as the ‘punching machine’ since the grinding operation is accompanied by the action of punching.
On the other hand, the centerless grinder is smaller in size and there is no need for any external support to work. Typically, these machines are used for producing fine pieces of metal jewelry, gears, shanks, screws, pins, and such other small components. The design of this machine features a part selection screen and a cut tool for producing the desired finish, surface roughness, and cutting direction. Most units have their own bench and workrest platform so that the operator may work at his preferred workstation.
To get a better understanding of the working process, it is important to know how the centerless grinder works. First of all, the machine setup consists of four to six mandrels, or centers, that will hold the workpieces for cutting. Next, a number of flat disks are placed between the centers, and these are used for grinding. These discs spin around at different speeds, due to centrifugal force, and thus, grind the material to the intended standards and specifications.
Although most centerless grinders are similar in design, the quality of the finished product may vary depending on the type of materials being worked on and the type and amount of workpieces being used. For instance, large-scale production of jewelries usually requires customized flat disks that are sized and cut according to the specifications of the client. Large flat disks, along with other special CNC grinders that are manufactured and designed for this type of operation, can even create a cross-section of material that resembles an egg.
On the other hand, with the use of a centerless grinder, small to medium-sized workpieces can also be grinded. Typically, small to mid-sized machining parts are used in this type of operation, such as wire, nylon, copper and brass alloys and stainless steel. In addition to using flat disks for the rotation of material, they can also be used with the use of rotating tools, such as rotation saws, which are often used in applications where intricate designs need to be generated. The rotary tool is used to cut away unwanted material and then the material is polished to create the final product. Overall, through-feed grinding machines are ideal for providing consistent and reliable performance during the fabrication, design and production of precision products that meet specific customer requirements.