This model is designed to meet the special requirements of users in the petroleum, geological, mining and chemical ndustries, and in agricultural irrigation and dranage. It is able to cut various straght and taper pipe threads of union joints, drill rods, casting pipes, drain pipes, well castings and water pump pipes more economically and efficiently as compared with the engine lathe. However, it may serve as an engine lathe to cut various metric, Whitworth and module threads, shafts and disks. After all it is an ideal machine for the petroleum, mining geological, chemical and agricultural industries.