A Centerless Grinder is a machine tool which grinds cylindrical parts with one or many diameters, with a variety of sizes to precision tolerances, low micro finishes, and accurate straightness. A Centerless Grinder can create new accurate part profiles. There are two different styles of centerless grinding, In Feed and Thru Feed.
A centerless grinder is made of three main components, a Work Wheel, sometimes called the Grinding Wheel, a Regulating Wheel, and a Work Rest Blade. A description of each component in as follows:
This is the machine component that does the actual removal of stock from the part to be ground, it determines the surface finish, and the shape of the part. The wheels come in many different grits, sizes, and bonds, depending on application.
The Regulating Wheel is the component that directs, guides and drives the part to be ground. It too comes in different grits, sizes, and bonds. It is tailored to fit the specific application.
Work Rest Blade
This machine component provides support for the part being ground. The part will rotate on the blade while grinding is taking place. The work rest blade may be straight or stepped depending on the part configuration.
In Feed Grinding
In Feed Grinding occurs when the material is placed on the work rest blade, between the work wheel, and the regulating wheel. With the part location remaining fixed, the regulating wheel advances, and the diameter of the part contacts the face of the grinding wheel. The part is positioned by means of a positive stop and removed from the wheels by means of an ejector at the completion of the cycle. In feed grinding is used to grind headed or tapered parts which require grinding on a surface other than the major diameter or parts which have more than one step which requires grinding.
Thru Feed Grinding
Thru feed grinding occurs when long material is placed on a work rest blade. The material travels between the grinding wheel and regulating wheel, and the ground material exits out the opposite side of the wheels. There are two types of parts which can be ground using the thru feed method. They are material with one diameter such as gage pins or roller bearings or multi-diameter pieces such as hydraulic valve spools. In multi-diameter thru feed applications the major diameter to be ground has to have adequate length to hold the piece level as it passes between the grinding wheel and the regulating wheel.