Selection guide Insert geometry Select the proper geometry based on material type, cutting conditions and component feature. The geometry is an important decision because it affects many parameters from stability to surface finish. Light (-L) Best suited for light-cutting operations. • Sharp positive cutting edge • Low cutting forces and minimized tool deflection • Generates a good surface finish • Low feed rates Medium (-M) First choice for general-purpose machining and mixed production. Heavy (-H) Ideal for unstable conditions such as interrupted cuts and abrasive materials. • Strong, reinforced cutting edge • High edge security • Requires good stability • High feed rates 8