Abstract: In this paper, a new mechanism was developed as a gearbox for power transmission between concentric shafts. With this approach, reduction ratios range from 10:1 to millions to one is possible for single-stage. This mechanism is very cheaper than planetary gears. The mechanism consists of one drive shaft and one driven shaft, conical gears which one of them is fixed and the others are ...

AIM This in vitro study compared the effect of a concave with a straight-bevelled cavity margin on the microleakage of Class V composite resin restorations in primary teeth. MATERIALS AND METHODS Standardised Class V cavity preparations were made in vitro on the buccal (all margins placed in enamel) and on the lingual (margins placed in enamel and cementum) surfaces of 20 sound primary molars...

In the present paper non-linear dynamics of a spiral bevel gear pair with backlash are investigated in order to clarify internal excitations major importance from vibration point view: manufacturing errors teeth profile, spacing errors, and elastic deformation teeth. some conditions, like case backside contact, destructive effect can be intensified leading complex dynamics; for such reasons her...

The tip asymmetry of a bevel-tip needle results in the needle naturally bending when it is inserted into soft tissue. This enables robotic needle steering, which can be used in medical procedures to reach subsurface targets inaccessible by straight-line trajectories. However, accurate path planning and control of needle steering requires models of needle-tissue interaction. Previous kinematic m...

The precision forging process of straight bevel gear are simulated by using finite element software DEFORM-3D. key parameters (heating temperature, upper die movement velocity, friction factor, web thickness and the height) forming optimized orthogonal test. Taking minimum load good corner filling as goals, technological for obtained, that is, heating temperature is 1200 degrees Celsius, veloci...