在实践中革新了一种新型镗刀杆(附图)。这种镗刀杆结构简单,应用可靠,由于是双刃切削,因此能消除单刃镗刀的某些弊病。新型镗刀刀杆的结构新颖。由于刀尖不在同一圆周,并且又不位于同一平面上,所以,进刀时两刃一前一后进入切削,效率约为单刃 In practice, a new type of boring bar was developed (with photos). This boring bar structure is simple, reliable application, because it is double-edged cutting, so you can eliminate some of the drawbacks of single-edge boring tool. New boring knife arbor structure of the new. As the tip is not the same circumference, and are not located in the same plane, so the two blades into the cutting knife into the next one, the efficiency of about a single blade