In accelerated tool life tests, the three main types of quick and less costly tool life testing are
(a) extrapolation on the basis of steady wear; conventional measurement of flank and crater wear; comparative performance against tool chipping
(b) measurement of abrasive wear; multi-pass turning; conventional measurement of diffusion wear
(c) extrapolation on the basis of steady wear; multi-pass turning; taper turning
(d) comparative performance against tool chipping; taper turning; measurement of abrasive wear