presentationprintTemp.ppt auto cad presentation

VIKRAM CHANDRA CHOUDHARY
Department:- Mechanical Engineering
Registration no :-
AutoCAD
Katihar Engineering
College
(Department of science and Technology . Govt of Bihar )

OUTLIN
E
 Introduction
 History
 Giving commands
 Object snap
 Zooming and panning
 Drawing 2D shapes
 Drawing 3D shapes
 Editing
 UCS
 Assignment
 The AutoCAD Advantage
 The Disadvantages of AutoCAD
 References

Introduction
 AutoCAD is a commercial software application for 2D
and 3D computer-aided design (CAD) and drafting —
available since 1982 as a desktop application and
since 2010 as a mobile web- and cloud-based app
marketed as AutoCAD 360.

History
 AutoCAD was derived from a program begun in 1977
and released in 1979 called Interact CAD, also
referred to in early Autodesk documents as MicroCAD,
which was written prior to Autodesk's (then Marinchip
Software Partners) formation by Autodesk cofounder
Mike Riddle.
 The ﬁrst version by the AutoDesk Company was
demonstrated at the 1982 Comdex and released that
December.
 The 2016 release marked the 30th major release for
the AutoCAD for Windows. The 2014 release
marked the fourth consecutive year for AutoCAD for
Mac.

How do we give a command?
 Command line
 Toolbars
(view/Toolbars)
 Drop-down menus
You can pick any one(s) that you are comfortable with.

What is
OSNAP?
 Osnap (Object Snap) settings make it easier to select
a 2d object’s points
 Endpoint
 Midpoint
 Perpendicular
 Center
 İntersection
Osnap will be active when
AutoCAD is expecting you to
pick a point on the working area
Type osnap on your
command window:

Zooming...
1.
2.
 You will need to zoom in and out while drawing with
AutoCAD. This doesnt change your objects or UCS,
only the way you see your working space. This can be
done in many ways:
Scroll bars
Typing z or zoom in your command window.
 All
 Center
 Dynamic
 Extents
 Previous
 Scale
 Window

Lets draw a
LINE:
 remember that AutoCAD recognizes an object by
its coordinates. You will need two given points to
draw a line.
(x2,y2,z2)
(x1,y1,z1)
 You can start at a random point on your WCS for
your FIRST POINT, but you should specify the
coordinates of your SECOND POINT.

1.




Give the command
 Type “line” on the command window, OR
Click on the line icon on the Draw toolbar,
OR Select Line on the Draw menu
2. Specify the ﬁrst point (a)
 Click on a random point on your working area (black
space)
3. Specify the second point in relation to the ﬁrst
point
@distance<degree
s @5<30
30
a
Lets draw a LINE
(1):
b

Lets draw a LINE
(2):


1. Hit F8 (ortho on)
2. Give the command
3. Specify the ﬁrst point
4. Specify the second point in relation to the ﬁrst
point
Point the cursor to the left hand side. You will see that
the cursor snaps only to 0o-90o-180o-270o
Type 7 and hit enter
a b
7 units

Lets draw a LINE
(3):
If we know the coordinates of the line we want to
draw, we can simply type them into the command
line. (However, this mostly is not the case.)
1. Give the command
2. Specify the ﬁrst point (4,8,11)
3. Specify the second point (5,11,23)
b
a
(4,8,11
)
(5,22,13
)

What
else?
 Rectangle: two diagonal lines
(pick ﬁrst point, select the second one with
relation to the ﬁrst. @5<-33)
 Circle/Arc: center and radius
 Polygon: specify the number of edges and
length of a side
A small tip: you can use the EXPLODE command for the tool to
split the object into its components or lines
a
b
a
d
d

Editing
…
 COPY
 MOVE
 MIRRO
R

ARRAY

SCALE

STRETCH

 STRETC
H
 EXPLOD
E
More
editing…
 OFFSET

ROTATE

ERASE

Polyline (pline)
 The PLINE command creates a chain line with
multiple vertexes and straight or circular
segments between the vertexes
 Draw a closed shape with the pline command:
 Then type PEDIT (polyline edit) on the command
line and see what you can do with it:
Enter an option [Close/Join/Width/Edit vertex/Fit/Spline/Decurve/
Ltype gen/Undo]:
Try Width and Spline

Hatching
 Hatching is used to add shaded patterns to objects and shapes
within an Autocad drawing. Hatch patterns can be used to
indicate a material to be used, such as a concrete hatch.
Alternatively it could be used to make an area of a drawing stand
out.
 You will pick:
 Pattern
 Scale
 Angle
 points

Drawing
SOLIDS
 Solids contain the “mass properties” of 3D objects.
 You can use the Solids toolbar for readily
accessible objects
 Box
 Cylinder
 Wedg
e
 Torus
 Con
e
 You can use the BooleanSoppheerreationsof more
complicated shapes.
 Union (join two solids)
 Subtract (carve out the second solid from the ﬁrst)
 Intersection (only the common area)

To increase the number of faces
 Tools > Options > Display tab >

We can create solids by extruding as well
 If you “extrude” a surface into the third dimension,
you simply add a thickness in section. This
basically is same as creating a “solid” object
Extrude 5
units 5 units
Extrude -4
units
4 units

UCS and
WCS
 The AutoCAD world is 3 dimensional. However, if we want to draw
a 2d object, such as a plan or a section, we will use only 2
dimensions (x and y).
 WCS (world coordinate system) is the imaginary plane that is
parallel to the ground. It is the default coordinate system.
 Modiﬁcations made to the World Coordinate System (WCS) result
in a User Coordinate System (UCS). It is the plane that you work
on. It enables the user to draw 3 dimensional objects.
 To create a new UCS, type ucs on the command window, then
say New and specify 3 points on your new UCS plane.

Lets change the
UCS
 —Prompt: Command: Type ucs and press Enter.
 —Prompt: Enter and option [New/Move/ orthoGraphic /Prev/
Restore/Save/Del/ Apply/?/World] <World>: Type in n for the New
option and press Enter. —Prompt: Specify origin of new UCS or
[Zaxis/ 3point/ OBject/ Face/ View/X/Y/Z <0,0,0>: Type 3 to select
the 3point option and press Enter.
 —Prompt: Specify a new origin point <0,0,0>:Use an Osnap or
coordinate to select the position for a new 0,0,0 point (this selects
the junction of the X, Y,and Z axes). NOTE: The intersection Osnap
will NOT work with solid models.
 —Prompt: Specify point on positive portion of X-axis <1.000,0.000,
0.000>:Use an Osnap or coordinate to select the direction of the
desired X-axis. NOTE: The numbers inside the brackets< > will not
necessarily be the same as those shown in this example.
 —Prompt: Specify point on positive-y portion of the UCS XY plane
<1.000,0.000,0.000>: Use an Osnap or coordinate to select the
direction of the Y-axis. The UCS icon should change position to
indicate the new UCS orientation.

Homework Assignment
 Your perspective assignments are due next week
(March 16, 2006, 5pm)
 You will submit your *.dwg ﬁles by email.
 Late submission will be accepted subject to a
mark penalty of 20% per day, up to two days. No
late submission will be accepted after March 18,
2006.
 You can email me with your questions, or stop by
my oﬃce anytime (A301)

AutoCAD
Advantage
 Removal of Data Translations
 SolidWorks / Solid Edge / Inventor Compatibility
 Industry Standard Translators
 Reduced Training Time/Cost
 Rapid Product Advancements

Disadvantages of AutoCAD
 Line
 Limited File Formats
 Color, Fill and Texture
 Non-Parametric

presentationprintTemp.ppt auto cad presentation

presentationprintTemp.ppt auto cad presentation

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