A head turning model for computer-aided character animation is presented in this paper.

This paper contains a detailed experiment analysis on the fracture section characteristic,metallographic organization,chemical consists and mechanics property of the drill-stem subs,and performs a set of analysis calculation on the mutative load which putting on the drill-stem subs.

Study and Develop on the High-speed Multi-channels Rotary Joint;

Orthogonal test was performed to determine the laser phase-transformation hardening process suitable for a rotary joint made of 35CrMo alloy,which was aiming at increasing the wear-resistance of the rotary joint.

The self-designed plug indexing mechanism has been installed on type B50505 slotting machine,which is easy to machine the inner foursquare parts.

Through analyzing interior structure of the rotating joint of HK-250 drilling machine, the causes of mud leakage and main shaft departure from center line were investigated, and the improvement measure was provided that is replacing the rotating joint of HK-250 by the rotating joint of DD-14OB drilling machine.