Surface grinding The completion of a workpiece to a very high standard of surface finish and flatness to close tolerance.Tool grinding: The profiling and sharpening of tool bits for metal turning and shaping operations and the sharpening of twist drills.

Tool grinding: The profiling and sharpening of tool bits for metal turning and shaping operations and the sharpening of drills.Surface grinding: The completion of a workpiece to a very high standard of surface finish and flatness to close tolerance.

The creation of a joint using a filler of similar composition to the metal being joined gives rise to fumes from the electrode coatings, metallic oxides, any paint or surface contaminant and possibly to ozone and nitrogen oxides.

Milling: The removal of material to provide a finished form of close tolerance and good surface finish. Milling may be used to form flat surfaces, grooves or recesses.