Centerless grinding method can generally be divided into three types: through-feed grinding (vertical grinding), cut-in grinding (horizontal grinding) and end-feed grinding.

1. Through-feed grinding
The so-called through-feed grinding means that the workpiece can continuously pass the entire grinding area during grinding. According to the shapes of the grinding surface, the grinding zones that the workpieces are fed through are also varied.
2. Cut-in grinding
In the work process, the grinding method in which the workpieces are fed only in the radial direction of the grinding wheel is called cut-in grinding.
3. End-feed grinding
End-feed grinding is a type of through-feed grinding. The workpieces make “passing-through” movement during grinding, but they do not completely pass through the grinding zone; rather, a stopper is used for limiting the end position of the axial movement of the workpieces.

The main characteristics of these three grinding methods are shown in the following table: