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Pentagonal Prism Projections in Engineering Drawing, Schemes and Mind Maps of Engineering Drawing and Graphics

University of Engineering and Technology Peshawar (UETP)Engineering Drawing and Graphics

A step-by-step guide to drawing projections of pentagonal prisms in engineering drawing. It includes examples illustrating different scenarios, such as prisms with axes parallel to both planes, prisms with bases in the horizontal plane, and prisms with inclined axes. Useful for students learning the fundamentals of engineering drawing and understanding the principles of projection.

Typology: Schemes and Mind Maps

2022/2023

Available from 03/26/2025

mohaiman-khan
mohaiman-khan 🇵🇰

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PROJECTIONS OF SOLIDS
1. TYPES OF SOLIDS
I. POLYHEDRA
A solid that has all faces as flat surfaces and are polygons.
A. Regular Polyhedra
All faces shall be regular polygons of the same size and
shape, and the solid itself shall be symmetrical all around.
•Tetrahedron has 4 equilateral triangles of the same size
•Hexahedron (cube) has 6 equal sqares
•Octahedron has 8 equilateral triangles of the same size
•Dodecahedron has 12 regular pentagons of the same size
•Icosahedron has 20 equilateral triangles of the same size
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PROJECTIONS OF SOLIDS

1. TYPES OF SOLIDS

I. POLYHEDRA

A solid that has all faces as flat surfaces and are polygons.

A. Regular Polyhedra

All faces shall be regular polygons of the same size and

shape, and the solid itself shall be symmetrical all around.

  • (^) Tetrahedron has 4 equilateral triangles of the same size
  • (^) Hexahedron (cube) has 6 equal sqares
  • (^) Octahedron has 8 equilateral triangles of the same size
  • (^) Dodecahedron has 12 regular pentagons of the same size
  • (^) Icosahedron has 20 equilateral triangles of the same size

A. Irregular Polyhedra

At least one face is either an irregular polygon or a different shaped

polygon than the other faces.

a) Prisms

Has two similar polygons of the same size and parallel to one

another as bases, the corresponding sides of which are

connected by means of parallelograms.

A regular prism is the one that has regular polygons as bases.

An irregular prism is the one that has irregular polygons as

bases.

A right prism is the one that has the axis perpendicular to the

bases.

An oblique prism is the one that has the axis inclined to the

bases.

II. SOLIDS OF REVOLUTION

Solid that are generated by rotating a plane about a line for one revolution.

A. Cylinder

Generated by rotating a rectangle about one of its side for one complete

revolution. Has two flat and one single curved surface.

B. Cone

Generated by rotating a right angled triangle about one of its

perpendicular arms for one complete revolution. Has one flat and one

single curved surface.

C. Sphere

Generated by rotating a semi-circle about its diameter for one complete

revolution. Has a double curved surface only.

2. POSSIBLE POSITIONS

A. Position of Axis w.r.t. H.P.

  • (^) Parallel to the H.P.
  • (^) Perpendicular to the H.P.
  • (^) Inclined to the H.P.

B. Position of Axis w.r.t. V.P.

  • (^) Parallel to the V.P.
  • (^) Perpendicular to the V.P.
  • (^) Inclined to the V.P.

ALWAYS DRAW THE VIEW IN

WHICH THE TRUE SIZE AND

SHAPE OF THE BASE IS SEEN

Example 1:

A pentagonal prism of 25 mm side of base and axis 50 mm long, has its axis parallel to both

the planes. One rectangular face of the prism makes an angle of 30o^ with the V.P. Draw its

projections.

x y

Example 1:

A pentagonal prism of 25 mm side of base and axis 50 mm long, has its axis parallel to both

the planes. One rectangular face of the prism makes an angle of 30o^ with the V.P. Draw its

projections.

x y x y

Example 1:

A pentagonal prism of 25 mm side of base and axis 50 mm long, has its axis parallel to both

the planes. One rectangular face of the prism makes an angle of 30o^ with the V.P. Draw its

projections.

x y x y

Example 1:

A pentagonal prism of 25 mm side of base and axis 50 mm long, has its axis parallel to both

the planes. One rectangular face of the prism makes an angle of 30o^ with the V.P. Draw its

projections.

x y x y

a " b" c " d" e" f" g" h" i" j"

Example 1:

A pentagonal prism of 25 mm side of base and axis 50 mm long, has its axis parallel to both

the planes. One rectangular face of the prism makes an angle of 30o^ with the V.P. Draw its

projections.

x y x y

a " b" c " d" e" f" g" h" i" j"

Example 1:

A pentagonal prism of 25 mm side of base and axis 50 mm long, has its axis parallel to both

the planes. One rectangular face of the prism makes an angle of 30o^ with the V.P. Draw its

projections.

x y x y

a " b" c " d" e" a ' d' e' c ' b' f" g" h" i" j"

Example 1:

A pentagonal prism of 25 mm side of base and axis 50 mm long, has its axis parallel to both

the planes. One rectangular face of the prism makes an angle of 30o^ with the V.P. Draw its

projections.

x y x y

a " b" c " d" e" a ' d' e' c ' b' g' h' j' i' f' f" g" h" i" j"

Example 1:

A pentagonal prism of 25 mm side of base and axis 50 mm long, has its axis parallel to both

the planes. One rectangular face of the prism makes an angle of 30o^ with the V.P. Draw its

projections.

x y x y

a " b" c " d" e" a ' d' e' c ' b' g' h' j' i' f' f" g" h" i" j"

Example 1:

A pentagonal prism of 25 mm side of base and axis 50 mm long, has its axis parallel to both

the planes. One rectangular face of the prism makes an angle of 30o^ with the V.P. Draw its

projections.

x y x y

a " b" c " d" e" a ' d' e' c ' b' g' h' j' i' f' f" g" h" i" j"