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Explain the uses of a steel rule .

   
Steelrule
When dimensions are given in a drawing without any indication about the tolerance , it has to be assumed that measurements are to be made with a steel rule .


         Steel rules are made of spring steel or stainless steel . the edges are accurately ground to form straight edges .

The surface of the steel rule is stain-  chrome  finished to reduce glare , and to prevent  rusting .

Sizes of steel rules 

Steel rules are available in different lengths, the common sizes being 150 mm , 300mm and 600mm.

The engineer's steel rule is graduated in 10mm , 5mm ,1mm and 0.5 mm .

The reading accuracy of the steel rule is 0.5mm .


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