According to the shaping principle of the hob machining evolvent gear,that only when best front rake positive angle of indexing circle is adopted,the shaping error is minimum is given by calculating.

Aiming to slove the problems of manufacturing error detecting on worm, a new method of testing manufacturing errors on enveloping worm based on space domain is developed.

The stress of casing pipe with manufacturing error is analysed by using finite element method,and the stress of the linking part between casing pipes is also analysed.

Taking consideration of the existence of manufacturing errors of aerostatic journal bearing, the paper deals with the calculation and theoretical analysis of the static characteristics of aerostatic journal bearing with orifices by Galerkin Finite Element Method (FEM).

The proposed model was then used to analyze the effect of the location of temporary pier on the manufacture error of the girder and to reveal the relationship between the location and the corners at the ends of the incremental segments during the in.

The manufactur errors of flexure hinge will influence the performances,so for reducing the flexible hinge on the performance of the sensitivity of manufacturing errors,the relation among design parameters of corner-filleted flexure hinge and manufacture error was founded by using multi-variable function of Taylor series expansion.

Aiming at solving the matter of fact of manufacture errors on worm, the worm test apparatus is studied by the tool research department in Chengdu.

It is concluded from the analysis of main parameters influencing the modeling error that 1 ) Machining efficiency and accuracy can be obviously improved by adjusting the install.