Increase frock of numerical control plano -boring and milling machine range of work

The utility model relates to an increase frock of numerical control plano -boring and milling machine range of work belongs to the numerical control plano -boring and milling machine and assists the utensil. The utility model discloses a: the extension bar, the extension bar axial is opened has the through -hole, installs the dabber in the through -hole, and through -hole one end is the inner cone, the outside outer cone parts that is in extension bar upper end, the outer cone parts bottom is connected with the boss. The utility model discloses a lathe main shaft passes through the extension bar with the handle of a knife is connected, the extension bar length that the lathe extends the head that has extended, and the processing that makes the large sized part deep trouth reliable and simple that becomes, the processingquality of part improves to some extent, has improved work efficiency greatly, has reduced the processing charges of part.