# Engineering Drawing - Mr. Tanaka`s Website

```Mr. Tanaka
I
have the blocks
that arranged on
weekend.
in the way that is
drawn.
 You won’t be able
to make the one I
have!
 There
are six sides on the drawing below
 If
an object is too large or too small to
draw on a piece of paper, a drawing can
be scaled down or up.
 The
scale for the L-shaped box is 1/2 or
1:2.
 It means that the drawing is a half of
actual size.
 Question: How long should 3” side of the
object be in this drawing?
 What would the scale on the drawing be
if you wanted to make it three times
bigger than the actual object.
What is the scale if a 4-inch length on the
drawing corresponds to a 4-foot length on
the actual objects?
Scale: ___ in.: ___in. or ___: ___.
A
building has a wall of windows that is
12 feet across. If a scale of 1:24 is used,
how wide is the wall of windows on the
drawing, in inches?
 Car
designers build models of new
designs because, unlike a drawing, a
model can be seen from all sides. If you
built a 1:10 scale model of a car that is 15
feet long, how long would the model be?
 In
you are a carpenter following a 1: 20
blueprint for a house and you measure on
wall on the blueprint to be 8 inches long,
how long should you build the wall for
 If
you discovered that the architect who
the scale should really have been 1:25,
how would you need to change the length
of the wall of the house?
 Orthographic
drawing
 Oblique drawing
 Isometric drawing
 Perspective drawing
 Orthographic
drawings show the top,
sides, and the bottom of an object.
Isometric drawings show the front, top, and right-side
vies.
 Depth is shown by slanting the edges up at a 30
degree angle from the horizon.
 This is especially useful to engineers because it
shows depth, and each line is drawn to scale.

show the front, top,
and one side of an
object.
 The front face of the
object is drawn as
though you are
looking at it from the
front.
 Horizontal edges are
drawn back from the
front at a 45 degree
angle.
 Lines are NOT drawn
to scale.

 Show
objects as they
would appear to the
naked eye or in a
photograph.
 Lines showing depth
converge toward an
imaginary
“vanishing points.”
 This creates the
appearance of
distance
 Like
oblique and perspective drawings
because they make it easy to picture
what buildings and other threedimensional objects look like in the real
world.
 Engineers don’t like them. Why do you
think that they prefer isometric and
orthographic, but not perspective??
 Isometric
and orthographic drawings are
used for manufacturing drawings.
 Why do you think that is?
 Step
1: Front View
 Step 2: Top View
 Step 3: Right-side View
 Step 4: Confirm Measurements
 Step 5: Erase the construction lines
 Step 6: Dimensions and labels
 To
Do’s
• Make something with blocks
• Make the isometric drawing of the blocks
• Make the orthographic drawing of the blocks
• Completion: 60%
• Complexity: 20%
• Neatness: 20%
 Complete
all steps
• Step 1: Front View
• Step 2: Top View
• Step 3: Right-side View
• Step 4: Confirm Measurements
• Step 5: Erase the construction lines
• Step 6: Dimensions and labels
 Make
it as complicated as you can
• Very complicated: 20%
• Complicated: 15%
• Kind of complicated: 10%
• Not very complicated: 5%
 Draw
all lines with rulers!
• Very neat: 20%
• Neat: 15%
• Kind of neat: 10%
• Not very neat: 5%
```