Pictorial Drawings Pictorials Isometrics Pictorial Drawings Shows an object

Document Sample

```					Pictorials: Isometrics
Pictorial Drawings

Shows an object like you would see in a
photograph
Give a three dimensional view of a room or
structure
Three common types
Axonometric
Oblique
Perspective
Pictorial Sketch of Kitchen
Tips for Pictorial Views
In pictorial views, hidden lines are not shown
unless absolutely required for clarity
Non-visible bottom of a blind hole
Important feature of object not in direct view

In pictorial views, holes or notches without
bottom/end visible should be assumed to go
completely through the object.
Centerlines are to be shown on all isometric
pictorials.
Isometric Drawings

The most common pictorials
Constructed with the two faces 30 degrees
above the horizontal
The axes are 120 degrees between each axis
Lines that are horizontal are drawn at 30
degrees
Vertical lines remain vertical
Introduction to Isometric Projection

CUBE

• Isometric means equal measure
• All planes are equally or proportionately shortened and
tilted
• All the major axes (X, Y, Z) are 120 degrees apart
AU 2005                                             4
Isometric of a Cube
Making an Isometric Sketch
• Defining Axis

60o          60o

30o                      30o

Isometric Axis
Making an Isometric Sketch
•   Axis Convention

Height
Choose the longest
dimension to be
the width (or the
depth) for optical
Width
Depth          stability

Front view           Isometric Axis Convention
Making an Isometric Sketch
• Axis Convention

Height

Choose the
longest dimension
to be the width or
Depth
Width              the depth for

iew
optical stability
v
Isometric Axis Convention        ro nt
F
Usage of the Grid Paper

Correct orientation      Incorrect orientation

Note the alignment of the axes
Going From Isometric to Rectilinear
Object for Practice
Blocking in the Object
Begin with Front Face

Front Face

Height

Width
Blocking in the Object: Add Side
Face

Side Face

Height

Depth
Blocking in the Object: Add Top Face

Top Face
Adding Detail Cut Outs – Part 1
Adding Detail Cut Outs – Part 2
Adding Detail Cut Outs – Part 3
Darken Final Lines - Part 4

Note:
All visible edges
will be darkened
Draw the Isometric

• Use Isometric Grid Paper
• Block is 6 x 3 x 3
Isometric View
Sketching a Circle
• Draw a square whose
sides are the diameter
of the circle.
• At the center of each
side define the point
of tangency for the
circle.
• Draw the diagonals of
the square.
• Orient the paper so
you can draw equal
arcs to construct the
circle
Isometric ellipses

In an isometric drawing, the object is
viewed at an angle, which makes circles
appear as ellipses.

Holes

Cylinders
Ellipses Can be in Any of Three
Planes
Ellipses still touch their quadrants to the midpoint of each
side of an isometric pictorial box. The easy rule is to
always align the major diameter of the ellipse with the
longest body diagonal of the construction box.
Sketching an Isometric of a Hollow
Pipe
Step 1 – Creating the Base Box

Diameter

Diameter          Length
Step 2 – Ellipse on Front Face
- Corner to corner to get center
- Lines to tangent points

Tangent Points
Lines to Tangent
Points
Step 3 – Ellipse on Front Face

Sketch in Arcs

Tangent Points
Step 3 – Ellipse on Back Face and Profile
Repeat for ellipse on rear face
Draw Tangent Lines for Profile
Complete Visible Part of Back
Ellipse
Step 4 – Ellipse for Hole on Front
Face
Create Box for Hole

Sketch Ellipse
Isometric of Hollow Pipe
Isometric Dimensioning

Dimension lines are parallel to the isometric
axes
Extension lines are extended in line with
these axes
Isometric Dimensioning
Review Questions
1. _______ sketches present the object in a single
view, with all three dimensions represented
2. _______ sketches present the object in a series
of projections, each one showing only two of
the objects’ three dimensions
3. Which among the following is NOT an isometric
axes (Hint: Use the Isometric Grid paper for
reference)?
a)                     b)         c)           d)
120°
60°    60°
90°
60°
120°          120°
240°

```
DOCUMENT INFO
Shared By:
Categories:
Stats:
 views: 444 posted: 9/24/2009 language: English pages: 39
How are you planning on using Docstoc?