The example of snag grinding is
* trimming the surface left by sprues and risers on castings
* grinding the parting line left on castings
* removing flash on forgings
Surface grinding is used to produce a smooth finish on flat surfaces. It is a widely used abrasive machining process in which a spinning wheel covered in rough particles (grinding wheel) cuts chips of metallic or nonmetallic substance from a workpiece, making a face of it flat or smooth.