The worn end mills with a collet
were fitted in a special holder for measurement. The accuracy of measurement
was ±5 microns. End mills were coated by suppliers to provide
the coatings used for testing. The coatings were pre-examined for
surface irregularities using optical and scanning electron microscopy.
Wear behaviour of worn tools was analyzed using SEM/EDS. EDS analysis
was employed as well for studying chemical composition of the
coatings.