Transcript Pictorials - Foundation Coalition

Pictorials in AutoCAD
Class 8.2 : Using AutoCAD to Create
Pictorial Drawings
Readiness Assessment Test 8.2.1
Individually take 3 minutes and respond to
the following question:
 What dimensions are contained on each of
the principal projection planes?
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Learning Objectives
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Use AutoCAD to draw an oblique of an object
given orthographic views of the object
Select the best orientation of an object in pictorial
Define what makes a drawing a: cavalier oblique,
cabinet oblique, general oblique, isometric,
axonometric, perspective, or orthographic views
Sketch pictorials of an object (either oblique or
isometric) given orthographic views of the object
Use AutoCAD to generate Isometric Drawings of
objects given the orthographic views of the object.
Types
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Obliques
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Axonometrics
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Cavalier
Cabinet
Isometrics
Others
Perspectives
Cavalier Oblique
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Front view true size
Receding Axis Angle
(Normally 30°, 45° or
60°) is Variable
Depth dimension
(receding axis) true
size
Cabinet Oblique
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Front view true size
Receding Axis Angle
(Normally 30°, 45° or
60°) is Variable
Depth dimension
(receding axis) half
size
General Oblique
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Front view true size
Receding Axis Angle
(Normally 30°, 45° or
60°) is Variable
Depth dimension
(receding axis)
between half and full
size
Angles in Oblique
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Angles in front view are drawn true size
Other angles must be located using coordinates
Appearance of angles may be distorted
Obliques
Obliques are theoretical drawings. In
reality, you can not actually view an object
as an Oblique
 Thin parts look very good as Obliques
 Parts with angular features on multiple
planes are difficult to draw as Obliques
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Circles in Oblique
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Drawn true size in front view
Drawn as ellipses on receding planes
Layout using a Rhombus
Today’s AutoCAD commands
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Drawing setup
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Drawing Aids
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ZOOM
General Concepts
Keyboard Coordinates
Editing and inquiry
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Display control
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MOVE
COPY
TRIM
Object Snap
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ENDPoint
TANgent
NEArest
Drawing Obliques in AutoCAD
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Initially you should make a rough sketch of the object to
get an idea of what your drawing should look like
Draw the front view as a flat orthographic view
Use the COPY command along with keyboard coordinates
to place the front view along the receding axis to represent
all frontal surfaces in the object
Connect the copies with lines representing the depth of the
object. Remember to use OSNAP to assist in this process
Use ERASE and TRIM as appropriate to remove unwanted
lines/arcs
Example
Example
Construction of an oblique
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Draw the front view
using normal
AutoCAD commands
and techniques
Construction of an oblique
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Use the COPY command to
replicate the front view to
depict the depth
Command: COPYE
Select objects: [Other corner:[ 11 found
Select objects:E
<Base point or displacement>/Multiple:
E
Base point: [
m
Second point of displacement:
@.8<40
E
Second point of displacement:
E
@1.8<40
Second point of displacement:
E
Construction of an oblique
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ERASE the portions
of the depth profiles
which will not be
seen.
Command: eraseE
Select objects:[
Select objects:[
…
Select objects: [
Select objects: E
Construction of an oblique
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Add receding lines
using OSNAP and the
LINE command.
Command: lineE
From Point: endpE of[
To Point: endpE of[
To Point:E
…
Construction of an oblique
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TRIM and ERASE the
remaining lines which
would not be visible.
E
Command: TRIM
Select cutting edges: (Projmode = UCS,
Edgemode = No extend)
[1 found
Select objects:E
Select objects:
<Select object to Trim>/Project/Edge/Undo:
<Select object to
trim>/Project/Edge/Undo:
E
[
Exercise 8.2.1
Isometrics
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Axes equally
separated (120°)
H, W, and D
measurements are true
size along iso. axes
Angles must be
located by coordinates
Circles appear as
ellipses on all surfaces
Drawing Isometrics in AutoCAD
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Initially you should do a rough sketch of the object by hand
to get an idea of what your drawing should look like
Switch the crosshairs to isometric mode
Draw the object using the LINE and ELLIPSE commands
Use F5 to toggle the current isometric plane
Use OTRHO and OSNAP to assist you in the drawing
TRIM or ERASE any portions which are not visible
Using isometric snap
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If the crosshairs
are not set in
isometric mode,
use the Drafting
Settings dialog
box.
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Right click on
snap button and
choose settings
Drawing Ellipses
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In isometrics, circular
features which lie on
the principal planes
are shown as ellipses
These MUST be
drawn using the
ELLIPSE command
Command: ellipseE
with the Isocircle
Arc/Center/Isocircle/<Axis endpoint 1>: iE
option
Center of circle:[
<Circle radius>/Diameter:[
Pair Exercise
Draw an Isometric pictorial of the object
shown on the next slide using AutoCAD.
 The grid is a .2” grid
 Use template E38c.dwt
 Erase the “Robot Foot”
 Include centerlines at the discretion of your
instructor
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Isometric Example
Think-Pair-Share
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In the next 1 minute as an Individual
if I only answer one question . . . specifically what don’t
you understand about pictorials [at least 3 things]
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
Paired Homework