Pyörähionta

Pyörähionta, also known as rotational grinding or orbital grinding, is a finishing process used to create a smooth, uniform surface on a workpiece. It involves using an abrasive material that moves in a circular or orbital pattern against the surface being worked. This type of grinding is distinct from centerless grinding, where the workpiece rotates between two grinding wheels, or surface grinding, which typically involves a reciprocating motion.

The primary goal of pyörähionta is to remove material and achieve a desired surface finish, often to prepare for subsequent processes like plating or painting, or to meet specific dimensional tolerances. The abrasive can be in the form of a grinding wheel, a belt, or a pad, depending on the application and the material being ground. The workpiece itself may or may not be rotating during the process.

Common applications for pyörähionta include finishing machine parts, tools, and decorative elements. It is particularly effective for achieving a high degree of surface smoothness and can be used on a variety of materials, including metals, plastics, and ceramics. The control over the abrasive's motion and pressure is crucial for achieving consistent results and avoiding surface defects. The specific type of abrasive, grit size, and rotational speed are all parameters that are adjusted to suit the material and the desired outcome.