For centerless plunge grinding, the workpiece is ground using a plunge method, whereby the grinding wheel is fed along the workpiece. For this reason, the grinding and regulating wheel have a negative profile of the workpiece, provided with the help of a dressing tool.
Even if its has varying diameters, bevels and radii, a workpiece can nevertheless be ground in one single plunge. If the grinding zone is wide enough, several workpieces can even be processed at the same time. This is referred to as doubled or mass production.
By inclining the workpiece and grinding spindle axis it becomes possible to undertake angular machining on the workpiece axis using the plunge grinding process. This in turn allows for machining or face or shoulder surfaces.
During centerless plunge grinding, also known as cross grinding, the regulating wheel is only slightly angled (such as by 0.1 … 0.2°). The rotation of the regulating wheel creates an axial force on the workpiece. The workpiece then moves against an axial stopper which keeps it precisely positioned.
The workpieces are fed into the grinding zone from the top or side. The insertion axis is thus located along the workpiece change position. Once completed, the grinding zone is closed by the movement of the feed slide and the workpiece is ground. After grinding, the grinding zone opens and the workpiece can be output.
The grinding cycle consists of several consecutive steps, which is why you also talk about the multi-stage grinding process. For multi-stage grinding, the challenge is to reduce the grinding allowance on a workpiece in the shortest possible time, i.e. economically while still adhering to the required workpiece roughness specifications. This can be achieved by dividing the grinding process into several stages (e.g. rough grinding, finishing and spark-out).
Illustration:  Initial Position,  Grinding,  Initial Position