Test report no. PLBO/13: VTn curves for tools of grade SIP, RD107 and RD110 when machining EN9

Summary Tools of SIP, RD107 and RD110 were tested at 300, 420 and 600 fpm cutting speed with .10 in depth of cut and .010 in/rev feed on EN9 to .030 in flankwear in order to find the constants in the expression VTn = C for the three grades. The values of ‘n’ were found to be .51, .53 and .46 and the values of C to be 4550, 4720 and 3620 for SIP, RD107 and RD110 respectively. It was found that at 600 fpm the crater wear of SIP was about a third of the wear of the other two grades.