Aborning, often can encounter the taper hole with all sorts of different taper, without appropriate taper hole reamer, be in especially odd or when small lot is produced, machine the special reamer that taper hole place uses to decrease, and the technological process that reduces place to use and time, usable and common twist drill will change reamer of wear taper hole, via be being used for many times, the effect is very good. Change the method that formulate: standard twist drill, on grinder wear place requires the cone measure of reamer, grind with the tool next (or grind by hand) grind the horn after going out, stay reasonable first flank can be used. When using, use first be less than taper hole small end diametical broach gets a bottom outlet, reamer of reuse taper hole has opening of bore with a reamer. In the course that cuts in bore with a reamer, but the workpiece material with different basis, choose corresponding cutting fluid, with lengthening cutting tool life is mixed improve quality of aperture of bore with a reamer. CNC Milling