(ii) R.F.( representative fraction) of the scale What Are The Requirements For The Construction Of A Scale?Īnswer : (i) Maximum distance to be measured To draw an object on a full, reduced and enlarged scale.Saya scale is in em, then a Vernier can measure very accurately up to 1/100 of a cmĪns- Scales can be used for the following purposes: Normally its least count is 1/100 of the scale unit.
Vernier calliper is an instrument to measure a dimension very precisely.
Vernier scale: It is a scale that is extremely accurate for measurement. These scales can be plain scales or diagonal scales. These can be placed side by side or placed over one and another, For example in alles and kilometres Comparative or Corresponding scale: These are two different scales having the same R.F. For example, a scale in m, dm and em is a diagonal scale, dm, and cm and mun is another diagonal scale. Diagonal scale: In which one can measure certain units, its one-tenth value as well as its one-hundredth value. For example, a scale in cm and mm is a plain scale, and dm is another plain scale. Plain scale: In which, one can measure certain units and their one-tenth value. Engineering drawing has its own grammar in terms of projections, conventional representations, types of lines, abbreviations, symbols and various geometric constructions.Īns – Drawing board, drawing sheet, mini-drafter, scale, pencil and sandpaper block, cello-tape, eraser and compass 
It is spoken, read, and written in its own way.So Engineering drawing is a starting point of all engineering branches such as Mechanical, Production, Civil, Electrical, Electronics, Computer science, Chemical etc.Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed.Why Drawing is called the Universal Language of Engineers?
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