Trial Design and Manufacture of Double Spiral Grooved Vacuum Pump.

Spiral length design

On the circular curve, lateral acceleration affects comfort. On the spiral, both lateral acceleration and jerk affect comfort.  The determination of maximum curving speed on the basis of lateral acceleration only is not critical because the lateral acceleration is proportional to the square of speed whereas jerk is proportional to cubic power of speed. The maximum speed on a curve is thus signi...

Design and Manufacture of Spiral Bevel Gears with Reduced Transmission Errors

A method for the determination of the optimal polynomial functions for the conduction of machine-tool setting variations in pinion teeth finishing in order to reduce the transmission errors in spiral bevel gears is presented. Polynomial functions of order up to five are applied to conduct the variation of the cradle radial setting and of the cutting ratio in the process for pinion teeth generat...

Vacuum Gauge to Vacuum Pump Valve

Design for Manufacture and Assembly

Design for Manufacture and Assembly (DFMA) technique has been utilized extensively in industry field these days. This paper is a detailed review which will discuss the development history of DFMA, compare some other “DFMA-like” theories, and good stories about the successful implementations of DFMA in real-word product design. 1. DFMA and its development history 1.1 Traditional design paradigm ...

An Intelligent Non-Trial-and-Error Design Method for Double Screen Frequency Selective Surfaces

An intelligent design method of double screen frequency selective surfaces (FSSs) is addressed in this paper. The employed unit cell is composed of two metallic screens, which are printed on both sides of a substrate. The presented non-trial-and-error approach is investigated based on the separate design of each screen. With the help of some physical intuition and an equivalent circuit model, i...