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A plating mill receives 6-8 ft. wide coiled steel and chemically treats it with a process similar to galvanizing.  The rolls have about a 4-6 ft. OD and are unraveled like paper towels.  The loose end of a sheet is fed into a pair of pinch rolls that direct the steel through several stations that wash, rinse, dry, and heat it.  After it is coated and treated, the steel is then rolled back into 4-6 ft. coils and shipped to automotive stamping plants.  An impressive mill like thid can be a city block long.

 

Feeding a new sheet into the pinch rolls and subsequent stations is time consuming.  To reduce this bottleneck, plant pe...

An automotive company built an assembly plant on land that had a limestone base. Research found that if the limestone was removed, crushed and re-laid, the plant stability and harmonics would be improved to a point that would offset the cost of crushing the limestone.

 

They used a large rock crusher that had a fairly simple hydraulic circuit.  Two Caterpillar front end loaders would dump large chunks of broken limestone into a chute from either side of the rock crusher.  A mechanical vibrator would move the limestone down to a large rotating drum with 50 to 60 swinging hammers that would pulverize the limestone into stones no larger than...

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