Page 86 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

• Draw the isometric circles for the bottom and top face of the cylinder inside the square prism using offset method.
• Draw common tangents to top and bottom of isometric circles.

• Complete the view by drawing visible lines thick and invisible lines thin. (Fig 18c)

Fig 18

Exercise 5.19
Draw the isometric view of a cylinder of φ 50 and height 70 mm by four centre arc method. (Fig 19)
Four centre arc method
• Draw the front and top position of cylinder. (Fig 19a)
• Draw the isometric projection of a square of side equals to the dia of cylinder. (Fig 19b)
• Draw the isometric drawing of a square prism of height 70 mm on the square drawn. (Fig 19c)
• Draw the bisectors RD and RA from R and PC and PB from P.
• Draw arcs with O and O as centres and radius O D or O A.
2
1
2
1
• Draw arcs with P and R as centres and radius PC or RD.
• Draw vertical lines from the end of the ellipse.
• Complete the isometric view of the prism. (Fig 19c)
• Fig 19d shows the cylinder in horizontal position.
• Follow the procedure of the cylinder in vertical position and complete the prism.

Fig 19

73

CITS : Engineering Drawing (Mechanical) - Exercise 5