In both internal cylindrical grinding and external cylindrical grinding, differentiation is made between cross grinding and traverse grinding. The process is mainly used to process cylindrical or tapered bores. During internal cylindrical longitudinal grinding, the longitudinal infeed motion is typically carried out by the grinding wheel. The radial infeed motion during internal cylindrical traverse grinding is handled by the wheelhead or the workhead, depending on the design of the machine. In general, the same kinematic relationships are in place as found in external cylindrical grinding. However, the contact arc between grinding wheel and workpiece is significantly larger than in similar external cylindrical grinding operations, making it more difficult to remove swarf and supply coolant lubricant.
When selecting the grinding wheel diameter, a ratio as close as possible to 0.65< ds/dw < 0.75 should be used. (ds = diameter grinding wheel, dw = diameter workpiece). Due to the relatively small spindle resilience (deflection of the grinding wheel adaptor shaft), the parameters for the machining task must be carefully defined. Especially for thin-walled components, the workpiece clamping in the chuck is relevant, as elastic deformations during clamping and grinding can affect the roundness of the machined surfaces.
Source: Conrad, Klaus-Jörg (eds.): Taschenbuch der Werkzeugmaschinen, 3. Auflage, München: Hanser Verlag, 2015. P. 645-647