Countersinking. A countersink Device enters the workpiece axially and enlarges the highest of an present bore into a tapered opening. Straddle milling uses two conclude mills mounted on two different sides of a similar arbor. This offers the ability to work on two different workpiece surfaces at the same time. https://myleszmvho.kylieblog.com/27237067/not-known-facts-about-cnc-milling-machines