Tandem Roller. Monday , June 04th , 2018 - 15:04:23 PM
The final wear course of asphalt concrete (a.k.a. asphalt or blacktop in North America or macadam in England) is laid using a paver and compacted using a tandem smooth drum roller a three-point roller or a pneumatic tyre roller. Three point rollers on asphalt were very common once and are still used but tandem vibrating rollers are the usual choice now with the pneumatic tyre roller s kneading action being the last roller to seal off the surface.
In a sequence of gears chained together the ratio depends only on the number of teeth on the first and last gear. The intermediate gears regardless of their size do not alter the overall gear ratio of the chain. However the addition of each intermediate gear reverses the direction of rotation of the final gear.
Idler gears can also transmit rotation among distant shafts in situations where it would be impractical to simply make the distant gears larger to bring them together. Not only do larger gears occupy more space the mass and rotational inertia (moment of inertia) of a gear is proportional to the square of its radius. Instead of idler gears a toothed belt or chain can be used to transmit torque over distance.
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