Page 81 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

Pictorial drawing (Isometric drawing)

Draw the isometric figures

Procedure

Exercise 5.1
Draw the isometric drawing of a rectangular prism of base 30 mm x 40 mm and the height 60 mm. (Fig 1)

Fig 1

• Draw the three isometric axes through point `A'.
• Mark AB = 15 mm, AD = 30 mm and AH = 50 mm representing the three sides of prism.
• Draw two vertical lines parallel to the line AH through points B and D.
• Similarly draw two more lines parallel to AB and AD through point H.
• Mark G and E the intersecting points.
• Draw lines parallel to GH and HE through points G and E intersecting point is F.
• Draw lines parallel to AB & AD through points D and B respectively intersecting at C.
• Join CB & CD with dash lines.
• Join F and C also with dash lines.
• Rub off the construction lines and complete the prism.
Exercise 5.2
Draw the isometric view of the stepped block given in Fig 2.

Fig 2

• Draw the isometric view of a rectangular prism of dimensions equal to the overall size of the block 45 x 25 x
30 mm.
• Draw the lines JD, DE, EF, FH, HI and IJ using the measurements given in the figure.
• Rub off SR, RD, SJ, SH and RF.

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CITS : Engineering Drawing (Mechanical) - Exercise 5