Construction, Steps, Figure diagram, Example Problems | Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (b): Development of Surfaces
Note: For uniformity always name the corners in topview in anticlockwise direction. After cutting the vertical edge always unfold in clockwise direction.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (b): Development of Surfaces
Suitability: This method is suitable for the solids having uniform cross section for their full length (Example: Prism and Cylinder)
Surfaces | Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (b): Development of Surfaces
Development methods are classified into four methods as below:
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (b): Development of Surfaces
Surfaces of various geometrical objects are :-
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (b): Development of Surfaces
Consider a square prism, side of base 'a' and height 'h' as shown in Fig. 16.1. The square prism has 4 rectangular surfaces (a x h) and two bases, top and bottom bases of size (a x a).
Development of Surfaces | Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (b): Development of Surfaces
`Development of surface' of a solid may be defined as the process of opening out all the surfaces of a three dimensional body onto a flat plane.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (b): Development of Surfaces
In engineering practice a large number of objects like funnel, tray, box, chimney, drum, storage tanks, ducts of airconditioner etc. are made of metal sheets.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (b): Development of Surfaces
The procedure of obtaining orthographic projections of different solids with various types of cutting planes were presented in the previous chapter.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (a): Sections of Solids
1. A square prism having a base with 40 mm side and 60 mm long axis is on HP with an edge of the base perpendicular to VP. It is cut by a horizontal section plane bisecting the axis. Draw the front view and sectional top view.
Construction, Steps, Example Problems | Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (a): Sections of Solids
When a sphere is cut by a horizontal plane the section will be a circle.
Construction, Steps, Example Problems | Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (a): Sections of Solids
Note that the circumference of 2, circle in top view is not divided into 8 (or) 12 equal parts as it is not required for either 11 apparent section (or) true section.
Construction, Steps, Example Problems | Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit IV (a): Sections of Solids
The cylinder is resting on its base on HP. ie., axis is perpendicular to HP. Hence true shape can be seen on top view. Top view to be drawn first.