Cleaving refers to a process for preparing the end faces of glass fibers by controlled breaking.
A collimator is an optical device for parallelizing light beams, such as converging lenses or concave mirrors.
Corundum blasting is an abrasive process for surface treatment in which corundum is used as the blasting medium. This process is suitable for removing layers of rust, scale, and paint.
In the case of cutting tools, cutting edge roughness refers to the non-uniformity along the cutting edge. It is a measure of micro deviations between the nominal and actual geometry of the cutting edge.