Engineering Drawing Part III

"Mastering Engineering Drawing & Graphics: Sectioning and Development of Solids, Isometric and Perspective Projection"

Created byManas Patnaik

Last updated 7/2023

English

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What you'll learn

After the end of this course, you guys will be able to interpret & comprehend technical drawings from the perspective of an Engineer.
Section of Solids to visualize internal features.
Learn Developing Surface of Standard Hollow Solids
Learn Isometric Drawings via excellent examples.
Explore Perspective Projection through animations and examples

Course content

4 sections • 30 lectures • 5h 47m total length

Idea of Sectioning12:08
Master sectioning by using a cutting plane to reveal the cross section, hatch details, and front, top, and side views while reducing hidden lines for engineering drawings.
Example 1 on Cylinder17:09
Shows drawing a vertical cylinder of 40 mm diameter and 60 mm length, with a 45-degree inclined cutting plane to hp, producing top, front, side views, and true section.
Example 2 on Square Prism11:56
Examine a 40 by 40 square prism of height 80 resting on hp with faces inclined to vp, using a 60-degree cutting plane to generate sectional views.
Example 3 on Square Pyramid12:40
Construct a square pyramid with base on the hp, using top view, sectional views, and true shape of the section from a plane inclined 45 degrees and bisecting the axis.
Example 4 on Hexagonal Prism17:56
Position a hexagonal prism on the HP with 30 mm base edges and 75 mm height, and cut at 45 degrees to HP to obtain sectional top and side views.
Example 5 on Hexagonal Pyramid16:19
Explore hexagonal pyramid with a 30 mm base and 65 mm axis resting on hp with edges parallel to vp; learn top, front, and side views and 45-degree cutting plane.

Understanding the Development of Surfaces in Hollow Solids27:38
Explore the development of hollow solids by flattening prisms, cylinders, pyramids, cones, and tetrahedrons, using radial line or parallel line methods, with practical examples like boxes and boiler shells.
Development of Cone_Example 112:26
Develop the cone as a sector of a circle with radius 25 and theta 130.85 degrees. The cutting plane is 60 degrees to HP and perpendicular to VP, bisecting axis.
Development of Cone_Example 26:55
Learn to develop a hollow cone: compute the sector angle from a 60 mm base and 70 mm axis, then create the true-length development with eight divisions.
Development of Cylinder_Example 17:42
Develop the lateral surface of a cylinder from a chopped front view using eight cutting points, line division, and parallel line development to a pi d by 60 mm development.
Development of Cylinder_Example 26:43
Develop cylinder: draw top and front views of a 50 mm diameter, 60 mm high cylinder on hp, apply a 45-degree cutting plane perpendicular to vp, and construct the development.
Development of Prism_Example 19:33
Develop the lateral surfaces of a pentagonal prism using the parallel line method, including top view setup, a 45-degree cutting plane to hp, and a 100 by 40 development.
Development of Prism_Example 211:22
Develop the development of a hexagonal prism with two cutting planes, predicting the top view from the front view. Use parallel lines to construct the development and extract true dimensions.
Development of Pyramid_Example 111:36
Develop the pentagonal pyramid with a 30 mm base and 60 mm axis by selecting the top view, using an auxiliary inclined plane, and constructing the development with true lengths.
Development of Pyramid_Example 18:44
Develop hollow pyramids from a square prism by a 45-degree cutting plane, predicting front and top views and constructing the complete development with true lengths and cutting points.

Complete Concept of Isometric Drawings52:20
Explore the complete concept of isometric drawings, including isometric projection, axis and lines, isometric planes, and using the 0.82 reduction factor to convert true lengths into isometric lengths.
Example 1_Isometric View of Cylinder with base oh HP and VP8:49
Explore isometric construction of primitive solids, starting with a cylinder resting on HP and VP, using the four-center method to inscribe an ellipse and generate two isometric views.
Example 2_Isometric View of Cone with base oh HP and VP3:19
Learn to construct isometric views of a cone with base diameter 50 mm and height 100 mm from orthographic projection, inscribe ellipses using four center method for hp and vp.
Example 3_Isometric View of Pentagonal Pyramid with base oh HP and VP3:44
Create an isometric view of a pentagonal pyramid from top and front views, inscribe pentagon in a rectangle, draw arcs and centers, and project to isometric with 70 mm offsets.
Example 4_Isometric View of Frustum of a Hexagonal Pyramid5:25
Construct the isometric view of a hexagonal pyramid frustum by creating base and top hexagons with arcs at 100 mm height, then use orthographic front and top views.
Example 5 on Metal Castings10:14
Learn to create isometric views from orthographic projections of metal castings, using the isometric axis and planes, first angle projection, and a freestyle top-down construction approach.
Example 6 on Metal Castings10:30
Demonstrates third-angle projection in metal castings, guiding front and top view construction, semicircular profiles, and isometric detailing using the four-center technique and hidden edges.
Example 7 on Metal Castings4:28
Explore constructing circular and semicircular profiles for metal castings using isometric projection, the four-centers technique for ellipses, and concentric circles with a cylindrical hole at 18 mm.

Getting a Feel of Perspective Projection7:12
Explore perspective projection through demonstrations that reveal vanishing points and one point, two point, and three point perspectives, explaining the principles and elements behind this realistic drawing technique.
Principle of Perspective Projection4:33
Explore the principle of perspective projection using a plane of projection and a station point to generate a perspective image. Move the station point to see how the perspective changes.
Elements of Perspective Projection3:54
Learn the elements of perspective projection, including the crown, station point, and picture plane, plus horizon, auxiliary ground plane, ground line, and central plane for 3D and 2D construction.
Example 1 on One Point Perspective16:23
Explore one point (parallel) perspective where edges converge at a single station point, and learn how different station point placements alter front and top views in third-angle projection.
Example 2 on One Point Perspective3:23
Recreate a block in one-point perspective from a third angle projection at 1:1 scale, label corners, and draw lines from the station point to reveal front, back, and hidden edges.
Example 1 on Two Point Perspective13:12
Explore two-point perspective for a 20 by 20 by 40 block inclined to the picture plane, using two vanishing points, a station point, horizon lines, and third-angle projection.
Example 2 on Two Point Perspective9:03
Explore two-point perspective through a pentagonal prism, establishing vanishing points, horizon line, and a station point to create accurate projection with visible and hidden edges.

Requirements

Proper knowledge of Projection and its application to Point, Line, Plane and Solids.
It would be beneficial if you also enroll to the preceding course "Master Engineering Drawing Part I & 2"
Fundamentals of Geometry as in using compass, protractor to make two dimensional shapes.
Set of Pencils (H,2H,3H and 4H), a minidrafter, protractor, compass or a rounder and good number of drawing sheets is all you need.
Well Patience, Hard Work and hunger towards learning is what i expect the most from you all.

Description

This course is all about learning the elements of Technical / Engineering Drawing. A picture is worth a thousand words and an animation is worth a thousand pictures. And by the end of this course, you will realize how easy it gets to learn stuff from animations. This is not merely a subject to consume, but it's a language which allows engineers across various disciplines to communicate. This course is relevant across all disciplines of Engineering be it Mechanical, Civil, Electrical or Computer Science. This is a mandatory first year course in most of the universities globally.

In Part III of Engineering Drawing, we will be covering the following topics in depth:

1. Section of Solids: A section of a solid is a two-dimensional representation obtained by cutting or slicing the solid along a specific plane. It provides a clear and detailed view of the internal features, dimensions, and relationships within the solid, which may not be readily apparent from external views alone. Sections are particularly useful in illustrating complex shapes, hidden features, and assemblies, enabling engineers to analyze, evaluate, and communicate design intent effectively.

2. Development of Surfaces of Hollow Solids: Hollow solids, such as cylinders, cones, pyramids, and spheres, often possess curved surfaces that are challenging to represent accurately in two-dimensional drawings. By developing the surfaces of these objects, engineers can obtain a flat representation that can be easily measured, manufactured, and assembled. This technique plays a crucial role in industries such as sheet metal fabrication, carpentry, plastic molding, and pipe manufacturing.

3. Isometric Drawings: Isometric projection is a form of axonometric projection, which means that all three dimensions of an object are represented at the same scale and with equal angles. In isometric projection, the object is rotated at specific angles (usually 30 degrees) around two perpendicular axes, resulting in a 3D representation that shows all three dimensions—length, width, and height—equally and clearly.

4. Perspective Projection: Unlike isometric projection, which maintains equal scales and angles for all three dimensions, perspective projection mimics the way the human eye perceives objects in real life. It takes into account the concept of perspective, where objects appear smaller and closer together as they recede into the distance. By replicating this effect in engineering drawings, perspective projection provides a more accurate representation of the visual experience.

Who this course is for:

Students who are about to enter into their First Year of Bachelor of Engineering regardless of their branch.
This course will also prove beneficial for school going students who have opted for Engineering Graphics or Engineering Drawing in their 11th and 12th Grade.
Students of Diploma and Polytechnic can also enroll to this course as Engineering Drawing is a mandatory subject.

Engineering Drawing Part III

What you'll learn

Explore related topics

Course content

Section of Solids6 lectures • 1hr 28min

Development of Hollow Surface of Solids9 lectures • 1hr 43min

Isometric Drawings8 lectures • 1hr 39min

Perspective Projection7 lectures • 58min

Requirements

Description

Who this course is for: