Steel rule least count

Steel Rules, General Information Steel rules, also called rulers, are essential in any shop when accuracy matters. Steel rules are inherently more accurate than folding rules because they are made in one piece and so avoid the inaccuracies, however small, which are inherent in folding rules because of the to play in their hinges. The requirements for accuracy in steel rules vary greatly, however, and the range of products varies likewise. Steel rules come in rigid and flexible versions. While their primary purpose is accurate measurement, they can also be used as guides for laying out lines, and if rigid enough, for cutting. The thinner, more flexible rules can also be used to measure rounded or cambered work. The differences in the prices of rules result from the various production methods, which also determine accuracy and legibility. Most rules are made by cutting the required length from a roll of band spring steel, with etched graduations. Rules made by this method are adequate for most applications and reasonably priced. Higher-priced rules are cut, not stamped, from plate steel (stamping would cause the material to warp), and the edges are ground. Graduations are machined, much deeper than etched graduations, longer-lasting, and easier to read in poor light.

The steel rule is a very common measuring tool. According to the Encyclopedia of Alternative Energy, flat steels rule are generally 6 or 12 inches long. These steel rules can either be flexible or rigid; their widths determine the accuracy of measurement. Thin rules are more accurate for measurements because division marks are closer to the object of measurement. A steel rule is used in geometry, technical drawing, engineering and building to measure distances and rule straight lines.