To modify the outside diameter (OD) of a precision machined component, there are two types of cylindrical surface grinding operations that can be used: centerless and centered. Grinding the OD of a CNC Swiss turned component offers several benefits: a smoother surface finish (Ra), a tighter OD tolerance (up to +/.0001”) and elimination of the distortion that can happen during heat treatment.
- In Centered grinding, the part is held stationary and the grinding wheel moves up and down the part to remove material. To do this, there are using small indentations on the ends of the part (called centers) to aid the grinding machine in holding the part stationary
- In Centerless grinding, the grinding wheel is stationary. The part moves through the machine and past the grinding wheel, which removes the material from the part. This process is used when the part can not have centers added to the ends of the component.
Pioneer Service has in-house capabilities for centerless grinding. In addition, depending on the project requirements, lead time and capacity, we also use several highly qualified outside grinding service providers for components. Outside grinding partners are often used when the component requires the combination of OD and ID (Internal Diameter) grinding.
The work center blade supports the component (workpiece) as it moves through the machine. The grinding wheel, regulating wheel and work center blade are all stationary. The component (workpiece) moves through the machine at a regulated speed to achieve the specified surface finish and size.
When grinding a component (workpiece) that has centers (see image right), the part is held stationary and the grinding wheel moves along the component to remove material to reach the specified tolerance and surface finish.