The quick changing tool post is a major spare part of the ordinary lathes.It is composed of te cutter-cartridge body and the toolhoder for various cutting tools which can replace the square tools table for processing works like cylindrical facing,end facing,cutting,knurling,drilling,enlarge,boring and reaming,etc.The height of tools can be regulated and positioned relative to the center line of machinespindle.It features external tool-matching,tool-matching,quick tool-changing(with 3 to 5 seconds),great precision in positioning and great hardness etc.