3.Experimental method
The workpieces were ductile steel (AISI1041), and the specification of cutter, the insert, and other devices are listed in table 1. The stylus surface profiler was used to measure the surface roughness, where the tracing velocity and the cutoff length were fixed at 18 mm/min and 0.8 mm, respectively. The measured data were amplified, and then sampled through the computer with an A/D converter. The face-milling cutter having six nominally equally spaced inserts was set into the tool presetter, and runouts of each insert were measured using an indicator. Table 2 shows the measured runout values of a tested face cutter. In specifying the axial and radial runout errors, normally an arbitrary datum would be chosen and the errors measured relative to that. That is, one insert position would be chosen as the datum and the others related to that.