Based on the coordinate system of the NC machine,the correoation beteen machine origin,the workpiece origin and the mechanical origin is elucidated emphatically,and the attention for utilizing is also demonstrated.

Analysis of operation principle for the cascaded multilevel inverter;

Waste solidification equipment is made for environmental protection,based on the introduction and the analysis of the equipment about function,operation principle,market prospect and design & fabrication,providing beneficial reference for the same equipment.

In this paper, the structure characteristic, operation principle and operation process of drum pressure filter were introduced as well as its application in chemical engineering industry, and the drum pressure filter was compared with traditional centrifuge.

The structure and working principle of lead style production motor;

TLL type centrifugal collector working principle and improvement;

Working Principle and Maintenance of Pulse Tachometer Generator;