Tandem Roller. Monday , June 04th , 2018 - 15:09:34 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.
Steam rollers were often dedicated to a task by their gearing as the slower engines were for base compaction whereas the higher geared models were often referred to as chip chasers which followed behind the hot tar and chipping laying machines. Some road companies in the United States used steamrollers through the 1950s and in the UK some remained in commercial service until the early 1970s.
The input gear in this gear train has 13 teeth and the idler gear has 21 teeth. Considering only these gears the gear ratio between the idler and the input gear can be calculated as if the idler gear was the output gear. Therefore the gear ratio
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