4140 w/cutter info

Iscar flash solid/eci-7-vf. 3/8"(9.52mm) 5 flute. 500sfm, .0011fpt. So 5000 rpm and 28 I'm. .918" deep and a max of .25" step over. 65% spindle load on a 20 hp motor. If you go to the 6 or 7 flute they want 650 sfm and 120 ipm with a .036" step over. This cut is quicker. Had a tool guy drop off these for us to try. 6 and 7 lasted 100 ish parts. See how this 5 holds up.