Crank And Connecting Rod Apparatus
This apparatus is designed to study the working and characteristics of slider crank mechanism. Connecting rod and crankshaft are used in engines to convert linear motion of piston into rotational motion of crankshaft etc.
Four Bar Chain Apparatus
Four-bar linkages are used to convert a uniform continuous rotation into a non-uniform rotation or oscillation. The apparatus has a disc with angular scale which is used to measure the exact input angle. The crank pin can be located at different radii on the disc.
An Oldham coupling has three discs, one coupled to the input, one coupled to the output, and a middle disc that is joined to the first two by tongue and groove. The tongue and groove on one side is perpendicular to the tongue and groove on the other. The middle disc rotates around its center at the same speed as the input and output shafts. Its center traces a circular orbit, twice per rotation, around the midpoint between input and output shafts. Often springs are used to reduce backlash of the mechanism. An advantage to this type of coupling, as compared to two universal joints, is its compact size.