After inputting the precision rank and symbol of deviation of width of teeth of internal gear pair,the biggest center distance after reducing width of teeth can be determined.

This paper introduces a method and some corresponding software for calculating tooth thickness allowance in involute cylindrical gears,based on ISO1328 1990 s International Standards for Gear Accuracy.

The effect of thickness deviation on the reflection spectra and phase shift of VCSELs has been analysed using optical transfer matrix method.

For researching thickness deviation of wide heavy plate caused by bilateral stiffness difference of plate mill,rolling force distribution is analyzed by using the principle of forces and torques equilibrium and the effects of the stiffness difference of plate mill on plate thickness deviation under a variety of roll length,plate width and rolling force is studied too.

For researching thickness deviation of wide heavy plate caused by bilateral stiffness difference of plate mill, rolling force distribution is analyzed by using the principle of forces and torques equilibrium and the effects of the stiffness difference of plate mill on plate thickness deviation under a varity of roll length, plate width and rolling force is studied too.

Through analyzing the demand of thickness deviation, a new monitoring method basing on ultrasonic measurement technique and computer control technique was put forwared.