Between Centres

Here, we must differentiate between two methods. In external cylindrical periph­eral plunge grinding (infeed grinding), the grinding wheel is arranged normally to the workpiece rotation axis, while in external cylindrical peripheral longitudinal grinding the grinding tool is moved equidistantly to this axis. Both grinding meth­ods generally work with up grinding. In up grinding, the vectors of grinding wheel
peripheral speed vs and workpiece peripheral speed vw are directed in opposition of each other in the grinding contact zone. Up grinding is advantageous here be­cause, due to the flatter grain engagement trajectories (see Chapter 2.2), improved surface finish can be achieved. Furthermore, in up grinding, the area of the contact zone is better supplied with cooling lubricant, in which the surface is generated. Yet this effect is in this case not as pronounced as in flat grinding and diminishes with decreasing depths of cut ae.