Heat buildup in cutting will speed the erosion mechanisms in
tools, and will cause deformations in the workpiece, which may increase
scrap rates. Thermal cycling, that is, rapid heating and cooling, is a
concern with interrupted cutting. This effect may cause great harm to tools,
the machine tool, and the workpiece. Heat generation can also cause cutting
fluids to increase their evaporation and breakdown rates, and to actually
cause fires with flammable and semi-flammable cutting fluids.