Engineering steel rule

  The uses of a engineer's steel rule 

Steel rule

When dimensions are given in a drawing with out any indication about the tolerance. It has to be assumed that measurements are to be made with a steel rule. Steel rule are made of spring steel or stainless steel. The edges are accurately ground to form straight edges.The surface of the steel rule is satin chrome finished to reduce glare and to prevent rusting. SIZES OF STEEL RULE:Steel rules are available in different lengths, the common sizes being 150mmm, 300mm, 600mm. The engineers steel rule is graduated in 10mm, 5mm, 1mm and 0.5mm. The reading accuracy of the steel rule is 0.5mm. For accurate reading, it is necessary to read vertically and avoid errors arising out of parallax. An experienced person can transfer measurements from a steel rule very accurately. The steel rule graduations are accurately engraved with the line thickness ranging form 0.12 to0.18mm.for maintaining the accuracy of a steel rule, it is important to see to it that its edges and surfaces are protected from damage and rust. Do not place a steel rule with any cutting tools. Apply a thin layer of oil when not in use