Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (a): Geometrical Construction
In practice an engineer come across a number of geometrical constructions such as construction of plane figures, solid figures, finding mid point of an arc, drawing a tangent to the circle and so on.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit 0 (c): Lines, Lettering and Dimensioning
Following are the rules of dimensioning generally followed while dimensioning a drawing.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit 0 (c): Lines, Lettering and Dimensioning
Circles : A circle may be dimensioned by its diameter represented by the symbol ϕ or by its Radius represented by the letter R.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit 0 (c): Lines, Lettering and Dimensioning
The systems of dimensioning are explained in the previous section, but the dimensions can be arranged in any one of the following ways when the dimensions are in series.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit 0 (c): Lines, Lettering and Dimensioning
Two different systems of dimensioning are recommended by Bureau of Indian Standards as i) Aligned system and ii) Unidirectional system
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit 0 (c): Lines, Lettering and Dimensioning
Elements of dimensioning are listed as below.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit 0 (c): Lines, Lettering and Dimensioning
The main objective of engineering drawing is to represent the correct shape and size of the object in an understandable manner.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit 0 (c): Lines, Lettering and Dimensioning
Characteristics of lettering in A and B types of lettering are summarised below.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit 0 (c): Lines, Lettering and Dimensioning
Vertical Capital Letters, Vertical Lower case Letters
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit 0 (c): Lines, Lettering and Dimensioning
Draw the guide lines as two horizontal parallel lines spacing at size of letters / numerals to be written.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit 0 (c): Lines, Lettering and Dimensioning
The Bureau of Indian Standards Code IS 9609 (Parts 0 & 1) - 2001 Specifies lettering. Specifications of letters and the rules of lettering recommended by BIS are summarised below.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit 0 (c): Lines, Lettering and Dimensioning
The art of writing the alphabets A, B, C etc. and the numbers such as 1, 2, 3, etc. is known as lettering.