Spiral bevel gear is widely used in various mechanical transmission systems, such as tractor system. Because it mainly the heavy-load conditions, would most likely resonate within rated speed, resulting tooth fatigue damage. In this paper, based on principle of meshing and machining, spherically involute profile equation spiral deduced precise modeling method CATIA studied. The natural frequenc...

Intravenous (IV) access is a common medical procedure in pediatrics. During pediatric IV insertion, a small size needle (22-24 gauge, 0.71-0.56 mm OD) with lancet tip is usually used to pierce into the vessel of the pediatric patient [1-3]. Because the veins of children are very thin, IV insertion is usually difficult. If the patient is very young or with other medical complex conditions, for e...