1. Front, Top, Side Holes & Curves Isometric
Engineering Drawing
Front, Top, Side
Holes & Curves
Isometric

2. Why do we need to learn to draw?
Technical Drawing:
the practice or skill of portraying objects in a precise way using certain techniques.
Technical Drawings tell us the following:
Shape
Size of Objects
Types of material that object is constructed of
Finish of Objects
Assembly
Engineers are confronted with the task of communicating the design, development and structures of machines to manufacturers and builders. The shape and size of various parts of a machine and its structure must be recorded on plane sheets in a systematic way for communication. The pictorial view of the object does not carry all the details, especially the inner details and correct shape of complicated parts. Different methods, therefore, are implied for describing the exact shape based on the ‘projectors’ drawn by engineers.   

3. Types of Drawings We’ll Cover
Orthographic/Multiview
Pictorial
Orthographic
Shows objects “true” shape
Does not look like a “picture”
Two Dimensional
Pictorial
Looks like a picture
3-D
Realistic

4. Orthographic Generating Multi-view Drawings
6 Views of an Object

5. Eliminate the Unnecessary
When we draw objects, we should only include the views that are needed to fully describe the object
Shape of the object
Shape of features
When we draw, convention is to use the right side view over the left side view if they both show the object equally well
Likewise, the top view is preferred to the bottom view if they both show the object equally well
Showing only the necessary views saves time, makes the drawing less cluttered, and makes the drawing easier to interpret

6. Multi-view Setup Primary Views: top, front, right side
Secondary Views: Left side, rear, bottom
There is always one dimension in common between adjacent views
4 angles of projection. Third angle projection is the multi-view setup used by the U.S.A. First angle projection is used in Europe.

7. Let Us Practice Creating a Three-view sketch:
Step 1: Block in the front, top, and right side views. Sketch the front view first using construction lines to project dimensions
Step 2: Lightly block the major features in views
Step 3: Use construction lines to project the location and size of features between views
Step 4: Finish adding the final lines
Let Us Practice
Step-by-step

8. LINES!

9. Hidden Lines Lines with short, evenly spaced, dashes
Indicate edges that you cannot see in a view

10. Center Lines Thin lines of alternating, long and short, dashes
Show centers of holes and axes of symmetry

11. Dimension Lines

12. Extension Lines

13. Order of Precedence
Visible Lines Hidden Lines Center Lines
Practice!

14. Creating an Isometric Drawing