The method of determining the size of fitting ring in time of reaching assembly precision with fitting assembly method has been studied, two formulae for calculation of the size of fitting ring have been gotten.

On the basis of constructure character of universal_joint cross couping,This paper analyses assembly method of universal_joint and axial socket hole,designs a kind of assist technological equipment to improve assembly method and raise assembly precision.

This technique forecasts the products assembly precision and assistants designers to get corresponding optimum assembly process to pre-control the products quality before the actual assembly.

By accuracy of foil mill is meant the control accuracy of systems,manufactory accuracy and installation accuracy of mill.

Base on the in-situ measurement and control of the assembling accuracy of chain -drawingoil machine, the measuring method of these physical parameters including relative plane, parallel of the plane, line, parallel of the line,and coplane of the line is studied, and a set of laser measuring system with high accuracy, wide-range application, easy operation is developed.

The relation between filling time and filling accuracy was described The probabilistic model to filling time of the filler fixed quantity by container with long pipe was established,which considered the influenee for some random variables upon filling tim

The relation between filling time and filling accuracy was described, and the formula of actual filling time was established.

Analysis of mostly measure to raise installation precision of roadster railway;