Tandem Roller. Monday , June 04th , 2018 - 15:06:53 PM
Road rollers use the weight of the vehicle to compress the surface being rolled (static) or use mechanical advantage (vibrating). Initial compaction of the substrate on a road project is done using a padfoot drum roller which achieves higher compaction density due to the pads having less surface area. On large freeways a four wheel compactor with padfoot drum and a blade such as a Caterpillar 815/825 series machine would be used due to its high weight speed and the powerful pushing force to spread bulk material. On regional roads a smaller single padfoot drum machine may be used.
Rollers are also used in landfill compaction. Such compactors typically have padfoot or "sheep s-foot" drums and do not achieve a smooth surface. The pads aid in compression due to the smaller area contacting the ground.
The transmission of rotation between contacting toothed wheels can be traced back to the Antikythera mechanism of Greece and the south-pointing chariot of China. Illustrations by the Renaissance scientist Georgius Agricola show gear trains with cylindrical teeth. The implementation of the involute tooth yielded a standard gear design that provides a constant speed ratio.
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