Engineering Sketching
(not in your book)
ENGR Graphics Fundamentals
Orthographic Drawings – 3 views
Isometric Drawings -- easy 3D view
Line types and weights – show centers,
and hidden lines
Dimensioning -- showing lengths
Describing an Angle Bracket
Orthographic Projection
Orthographic drawings
represent three
dimensional objects in
three separate views
arranged in a standard
manner.
Orthographic Views
You can adequately describe most objects
with three orthographic views.



Front
Top
Right
Converting to Orthographic
Construction of Views
Must align orthographic views
Width appears in Top and Front
Height appears in Front and Side
Depth appears in Side and Top
Height and width project directly
Depth must be projected via a 45°
angle
Step 1 - Lightly Block Three Views
Use very
light lines
for drawing
in the
construction
lines
Step 2 - Lightly Block Major Features
Step 3 - Add Features, Use Miter Line
Steps in Creating the Three-View Sketch
Step 4 - Add Final Lines
Steps in Creating the Three-View Sketch
Completed Sketch
Think-Pair-Share
In the next 1 minute as an Individual
if you could ask a question . . . specifically what don’t
you understand about today’s topic what would it be.
[at least 3 items should be listed]
Now take 2 minutes
to merge your list with the person sitting next to you
AND add 1 new item to the list
In the next 5 minutes
share the results with the other half of your team,
delete questions that you can answer for each other,
AND prioritize the remaining questions your list
Team Exercise
Complete three orthographic views of
the object shown on the next slide.
Include visible, hidden, and center lines
where appropriate.
Use the grid paper in the back of your
book or your engineering sketch pad.
You will be given 7 minutes.
Object for exercise
ISOMETRIC DRAWINGS
Isometric Drawings
Isometric is the easiest way to create a
fairly realistic 3D sketch of an object
• lengths are preserved on each plane
Making an Isometric Sketch
- Defining The Axis (use iso-grid paper)
60o
60o
30o
30o
Isometric Axis
Making an Isometric Sketch
- Axis Convention
Height
Width
Depth
Isometric Axis Convention
Object for Practice
How would you
sketch this object?
Blocking in the Object
– Begin with Front Face
Front Face
Height
Start with
Isometric Axis
Width
Blocking in the Object
– Add Side Face
Side Face
Height
Depth
Blocking in the Object
Top Face
– Add Top Face
Adding Detail – Cut Outs
– Part 1
Adding Detail – Cut Outs
– Part 2
Adding Detail – Cut Outs
– Part 3
Darken Final Lines
Draw an Isometric View of this object
Step 1: Front Face
Step 2: Right Face
Step 3: Top Face
Step 4: Remove material
Step 5: Darken lines
Dimensioning
It is important that all persons reading
a drawing interpret it exactly the same
way.
Parts are dimensioned based on two
criteria:


Basic size and locations of the features
Details of construction for manufacturing
Standards from ANSI (American
National Standards Institute)
Dimensioning Shows:
Size
Location & Orientation
Scaling vs. Dimensioning
Drawings can be a different scales, but
dimensions are ALWAYS at full scale.