How To Setup AUTO CAD on Your Desktop:
·
In
the Start Menu, select Programs > Auto desk > Auto CAD 2007 > Auto CAD 2007.
·
If
a green dialogue box appears, select Auto CAD
Default or Auto CAD Classic and
click OK. If it then asks to show you new features, select
No and click OK.
·
In
the pull-down menu at the upper left, select Auto CAD Classic (not 3D
Modeling).
·
Under
the Views menu, select 3D Views / Top. Then select Visual Style
/ 2D Wire frame
·
Under
the Tools menu, select Drafting Settings. Select the Snap and Grid tab. Check Snap On and Grid On. Set Grid Spacing
to 1.0 and Snap Spacing to 0.5. Under
Grid Behavior check Display Grid Beyond Limits and unchecked Adaptive Grid. Next s`elect the Object Snap tab. Check that Object Snap On is not selected. Click OK.
·
In the horizontal
menu bar at the upper right of the screen there are three tabs labeled By Layer. Select the left tab (line color=red) and the right tab (line weight=0.05). Note that lines having
the wrong weight or color will not cut properly on the laser cutter.
Measuring Commands:-
GRID: Displays a grid of dots at a desired spacing on the screen Command: GRID (enter)
On/Off/Tick
spacing(x)/Aspect: (enter value) (enter)
SNAP:-
Specifies a "round off" interval so that points entered with
the mouse can be locked into alignment
with the grid spacing.
Command: SNAP (enter)
On/Off/Value/Aspect/Rotate/Style: (enter value) (enter)
Basic Draw
Commands:-
CIRCLE:- Draws circles of any size.
Command: Circle (enter)
3P/2P/TTR/<center
point>: (pick a center point)
Diameter
or <Radius>: (Pick a point on the
circle)
Command: L (enter)
From
Point: (pick a point using the mouse)
from starting point and connect to the second point and then enter)
from starting point and connect to the second point and then enter)
command:- Polyline (PL)
Polyline is a command which can be used for more than 2 points.
Command:- Boundary (BO)
B enter
select the boundary
enter
enter
ARC:- Draws
an arc (any part of a circle or curve) through three known points.Polyline is a command which can be used for more than 2 points.
Command:- Boundary (BO)
B enter
select the boundary
enter
enter
Command: ARC (enter)
Center/
< Start point > : (pick the first
point on the arc)
Center/End/
< Second point > : C
Center: (pick the arc's center point)
Angle/Length
of chord/ <End point > : (pick the
arc endpoint)
Display Commands
Display Commands
LIMITS:-Sets the size of the drawing
paper. For size "A" drawing
paper the limits should be set for 10.5
x 8.
Command: LIMITS (enter)
On/Off/Lower
left corner <0.0000> (enter)
Upper
right corner: 10.5,8 (enter)
ZOOM: Enlarges
or reduces the display of a drawing.
Command: ZOOM (enter)
All/Center/Dynamic/Extents/Left/Previous/Vmax/Window/<Scale(x/XP)>:
(pick a
point to define one corner of a rectangular viewing window then pick a point to
define the second point to define
the opposite diagonal corner of the viewing window)
Note:
To return the picture to its
original viewing size enter ALL and press the enter key when prompted instead
of defining a window.
PAN: Allows you to move your view point around
the drawing without changing the magnification factor.
Command: PAN (enter)
Editing Commands
CHANGE:-Alters properties of selected
objects
Command: CHANGE (enter)
Select
objects or window or Last (select objects to be changed)
Properties/<Change
point>: (type P)
Change
what property (Color/Elev/LAyer/LType/Thickness)? (type Layer)
New
Layer: (enter new layer name and press
enter)
ERASE:-Erases entities from the drawing… Command:
ERASE (enter)
Select
objects or Window or Last: (Select objects to be erased and press enter when
finished)
EXTEND:-Lengthens a line to end
precisely at a boundary edge.
Command: Extend (enter)
Select
boundary edge(s)...
Select
Objects (pick the line which represents
the boundary edge which lines will be extended to)
(press
enter when finished selecting cutting edges)
<Select
object to extend>/Undo: (pick the
line(s) that need to be extended
TRIM:- Trims
a line to end precisely at a cutting edge.
Command: Trim (enter)
Select
cutting edge(s)...
Select
Objects (pick the line which represents
the cutting edge of line in which objects will be trimmed to)
(press
enter when finished selecting cutting edges)
<Select
object to trim>/Undo: (pick the
line(s) that need to be trimmed)
Grips
You can edit selected objects by manipulating grips
that appear at defining points on the object.
Grips is not a command. To
activate grips simply pick the object.
Small squares will appear at various entity-specific positions. By selecting an end grip you can stretch the
entity to change its size. By selecting
the center grip you can move the entity to a new location. To remove grips press CTL-C twice. You can perform the following using grips:
Copy, Multiple Copy, Stretch, Move, Rotate, Scale, and Mirror.
Creating Layers
LAYER: -Creates named drawing layers
and assigns color and linetype properties to those layers.
Command: LAYER (enter)
A Layer
& Linetype Properties dialog box will be displayed. To add a new layer, pick the New button. A new layer listing appears, using a default
name of Layer1. the layer name can be
changed by highlighting the layer name.
Colors and Linetypes can be assigned to each new layer by picking the
color box to assign a color and picking the linetype box to assign a line type.
Standard
AutoCAD colors
1
= Red 2 = Yellow 3 = Green 4
= Cyan
5
= Blue 6 = Magenta 7 = White
Standard
AutoCAD linetypes
Hidden2
= hidden lines
Center2
= center lines
Phantom2
= phantom or cutting-plane lines
Construction Commands
ARRAY:-Makes multiple copies of
selected objects in a rectangular or circular pattern
Command: ARRAY (enter)
Select
objects or Window or Last: (select
object to array)
Rectangular
or Polar array (R/P) <current>: (P)
Center
point of array: (pick the point around
which to form the array)
Angle
to fill (+=CCW, -=Cw) <360>:
(enter)
COPY:- Draws
a copy of selected objects.
Command: COPY (enter)
Select
objects or Window or Last: (select objects to be copied)
Base
point or displacement: (pick a point on
the object to be use as a reference point)
Second
point of displacement: (pick a point
which represents the new location of the copied object)
MIRROR:-Makes mirror images of existing
objects.
Command: MIRROR (enter)
Select
objects or Window or Last: (select objects to be mirrored)
First
point of mirror line: (pick a point on
top of the mirror line)
Second
point: (pick a point on the bottom of the mirror line)
Delete
old objects? <N> y or n (enter)
MOVE: -Moves designated entities to another location.
Command: MOVE (enter)
Select
objects or Window or Last: (select objects to move)
Base
point or displacement: (pick a point on
the object to be use as a reference point)
Second
point of displacement: (pick a point
which represents the new location of the object)
OFFSET:-Constructs an entity parallel
to another entity at a specified distance.
Offset can be used with lines,
circles, arcs, and polylines.
Command: OFFSET (enter)
Offset
distance or Through <last>: (enter
a distance value)
Select
object to offset: (select object to
offset)
Side
to offset: (Pick any point on the side
of the object you wish to offset)
FILLET:- Changes any corner to a rounded
corner.
Command: FILLET
Polyline/Radius/Angle/Trim/Method/
<Select first line > : (pick the
first line)
Select
second line: (pick the second line)
CHAMFER:-Changes any corner to an
angled corner.
Command: CHAMFER
Polyline/Distance/Angle/Trim/Method/
< Select first line > : (pick the
first line)
Select
second line: (pick the second line)
OSNAP:- Instantly locates exact points relative to existing objects
(points).
Object Snap Modes:
Endpoint, Midpoint, Center, Quadrant, Intersection, Insertion,
Perpendicular, Tangent,
Nearest, Node, and None.
Placing lettering
on a drawing
TEXT:- Draws
text characters of any size.
Command: TEXT (enter)
Justify/Style/<Start
point>: (pick a starting point or
enter a justification letter)
Height
(0) (enter the height of the lettering)
Rotation
Angle (0) (enter)
Text: (enter the desired lettering) (enter)
Summary of
Options
<Start
Point> Left-Justifies text along
its baseline
Justify Justifies text according to the alignment
options
Style Enters a new text style
Null
reply Enters a new line of
text below the previous text.
(space
or Enter key will give a Null reply)
Text Alignment Options
Alignment Abbreviation Orientation
Aligned A Aligns text between two points. Text height will adjust automatically
Fit F Fits
text between two points. Text height will
not change
Centered
C Centers text at the baseline of a
specified point
Middle M Centers
text horizontally and vertically at the baseline of a specified point
Right R Right
Justify text at the baseline of a specified point
Alignment Abbreviation Orientation
Top Left TL Left Justifies text
at the top of text
Top
Center TC Centers text at the
top of text
Top
Right TR Right justifies text
at the top to text
Middle
Left ML Left justifies text at the middle of text
Middle
Center MC Centers text both horizontally and
vertically at
the middle of the text
Middle
Right MR Right justifies text at the middle of text
Bottom
Left BL Left justifies text at the bottom of text
Bottom
Center BC Centers text a the bottom of text
Bottom
Right BR Right justifies text at the bottom of text
The SPELL command will check the spelling
of a group of text.
Crosshatching a
drawing
BHATCH:-Allows the user to crosshatch
areas of a section view.
Command: BHATCH
(enter)
The Boundary Hatch
dialogue Box will be displayed. Select
the Hatch Options box.
The Hatch Options box
will be displayed. Select the Patterns
box.
The Choose Hatch
Pattern box will be displayed. Select
the desired hatch pattern.
The Hatch Options box
will be displayed again. You can select
a scale and rotation angle for the crosshatch pattern. Select the OK box when finished.
The Boundary Hatch
dialogue box will be displayed again.
Select the Pick Points box. When
prompted select the internal point of the are to be crosshatched. Press the enter key when finished.
The Boundary Hatch
dialog box will be displayed again. Select the Apply box to add the
crosshatching to the drawing.
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