With the helical cone sharpening method not only the straight major cutting edge and the better distribution of the clearance angle can be obtained,but also the problems,that the strength of the drill's core is not strong enough when sharpened with the variable lead helic.

In this paper,the change of peeling clearance angle was researched,and the optimum change was given.

At the same time, it set up an assistant side and a plane to solve the back angle of the main edge in any spot.

The paper explores an analysis on the working and mechanical conditions of milling and cutting bifunctional tools on soil stabilizer rotor,and thus advances setting principles for the milling tool s anterior angle,relief angle and installation angle.

According features of woodworking cutting tool and grinding machine,the installing of woodworking cutting tool,factors effect of tool\'s relief angle,considered issues during programming and an example of grinding were introduced.

Objective: To provide anatomical basis for endoscopic transoccipital horn lateral ventricular surgery.

[Objective]:To design a safe、perfect operating approach and provide anatomical basis for neuroendoscopes surgery from occipital horn in lateral ventricle by simulating endoscopic surgery so as to decrease the neopathy and extend the indications.