The grinding wheel rotates in the spindle head and is also adjustable for height by any of the methods described previously Modern surface grinders are semiautomated depth of cut and sparkout may be preset as to the number of passes and once set up the machining process requires very little operator intervention The grinding wheel rotates in the spindle head and is also adjustable for height by any of the methods described previously Modern surface grinders are semiautomated depth of cut and sparkout may be preset as to the number of passes and once set up the machining process requires very little operator intervention