This article analyze the main reason of which outside diameter micrometer's radial swing and plane degree and parallel degree was in low veracity, and introduced the basic method of resolving the above problems.

Taking into account assembly tolerance and geometric tolerance, with the maximum and minimum method, a parallel degree calculating method for the missile launcher is put forward.

By means of a pair of parallel-symmetry steel assembled frame designing and through the selection of modified epoxy resin adhesive and bonding technology,finally solved the problems about the deformation and the parallel degree of the wave-guide units,the thickness of the adhesive layer controlling and the bond strength of the wave-guide lens.

The key issue in large tower device fabrication is to guarantee the linearity, rectangularity and parallel.

1 750m\+3 BF hoist at intermediate relining, then the effect of level, center space and axes line parallel on the noises of big gear pairs produced by vibration is summarized, and the adjusting measures are put forward as well.

Precision Measurement of Parallelism Error Between Machine Guideway and the Axis of Spindle;

Design of the Light Parallelism Detector;

A New Method for Measuring Work Piece Parallelism Based on Digital Image Processing;