THE BIRD-CAGE METHOD USED FOR MEASURING CYLINDRICITY. A PROBLEM OF OPTIMAL PROFILE MATCHING.
The bird-cage method used for measuring cylindricity is reported to be the most effective, as it pro- vides the most detailed information about an analyz ed ob- ject. The average values of profiles measured with the cross- section and the generatrix methods may differ sligh tly, yet this may result from some design imperfections of t he measurement instruments used. In this study, the pr oblem of optimal profile matching is formulated and solved. As a result, the differences between the values of the r egistered profiles at the points of intersection of the scann ing trajecto- ries can be minimized.
The characteristics of pneumatic piston drive
The article presents a study on the rodless pneumatic piston actuator. Mathematical model of the pneumatic actuator, static and dynamic characteristics are obtained and compared with the real drive characteristics.
A new power measuring circuit using a bridge-connected magnetic circuit and another magnetic core
The authors describe the operating characteristics of an oscillating circuit using a bridge-connected magnetic circuit and another magnetic core. A square-shape output voltage is obtained in the oscillating circuit. The pulsewidth in positive and negative half cycles of output voltage changes with the current of the U-form core windings and with the signal voltage applied to the exciting windings. The mean value of the output voltage varies in proportion to the product of the current and the signal voltage. Utilizing this feature, an application of the oscillating circuit to a novel power measuring circuit of simple construction is presented. >