A method of machining the internal double-arc spiral bevel gear with a finger milling cutter was presented. The mathematical model tooth profile established considering principle by generating method, and three-dimensional (3D) graph developed. Subsequently, applying meshing theory, 3D alignment curve for established. Based on surface equation crown gear, intercept derived. divided into four cu...

The present study examined whether school-age children show risk compensation and engage in greater risk taking when wearing safety gear compared to when not doing so when running an obstacle course containing hazards that could lead to physical injury. Because sensation seeking has been shown to influence risk taking, this child attribute was also assessed and related to risk compensation. Chi...

Targeting an accurate and realistic simulation of the gear hobbing process, we present an effective and factual approximation based on three-dimensional computer-aided design. Hobbing kinematics is directly applied in one gear gap. Each generating position formulates a spatial surface path which bounds its penetrating volume into the workpiece. The three-dimensional surface paths generated from...

To ensure the gear precision, industries need a coherent model to express, to analyse and to check geometrical specifications. Most gear tolerance representations are directly driven by the convenience of dimensional metrology and not by the convenience of the set of activities of the tolerancing process. Therefore, to ensure the coherence of all tolerancing process activities, there is a neces...

In this study, a 42-degree-of-freedom (42-DOF) translation–torsion coupling dynamic model of the wind turbine’s compound gear transmission system considering time-varying meshing friction, stiffness, damping, error and backlash is proposed. Considering different between internal external teeth planetary gear, stiffness calculated by using cantilever beam theory. An improved friction takes into ...

For 300 years, the models and metaphors of Newtonian physics have dominated the world of science. Newton offered an image of the universe as a machine, a clockwork mechanism. Newton's universe is ruled by linear cause and effect--one gear turns, which makes a second gear turn, which makes a third gear turn, and so on. This cause-effect relationship is captured in Newton's F=ma formula: force gi...

A cycloidal planetary reducer, which fulfils both high reduction ratio and low vibration in a thin small body, had been proposed to cope with the further downsizing of DC motors. The mechanism is inspired by intellectual toy ‘Spirograph’ structurally based on reducer. Instead internal gear output plate skid epitrochoid groove introduced. sun connected input shaft carrier works as stator. has pi...

In order to study the dynamic meshing characteristics of the elliptic cylinder gear and obtain the meshing error of the gear transmission system, the two-dimensional static contact analysis of the gear tooth surface is carried out by using ANSYS software, and the key parts of the contact area of the tooth surface are determined. Then, the dynamic meshing model of the elliptic cylinder gear is e...