CAD 1-3
world coordinates
(2.5, 3) coordinate system used by auto cad as the basis for defining all object and other coordinate system defined by the users
files of type
(DWG) standard autoCAD
startup system
0: start a drawing defined settings 1: displays the create new drawing dialog box can be used 2: displays a new tab with options, a custom dialog box can be used 3: displays a new tab with options (default)
startup dialog box options
1 open a drawing 2 start from scratch 3 use a template 4 use a setup wizard
rectangular coordinates entry
@0,2.5
relative polar coordinates entry method
@3<90
cartesian coordinate system
CAD systems the world space is defined using a three-dimensional
what is CAD measured in
UNITS
middle mouse button/wheel
allows quick pan and Zoom
tan tan radius
allows us to create a circle that is tangent to two objects
snap to endpoint
allows us to snap to the closest endpoint of objects such as lines or arcs
snap to tangent
allows us to snap to the point on a circle or arc that when connected to the last point forms a line tangent to that object
trim command
an object so that is ends precisely at a selected boundary
construction line
are lines that extend to infinity, usually used as references for creating other objects
absolute coordinate values
are measured from the current coordinate system's origin point
relative coordinate values
are specified in relation to previous coordinates
draw and modify toolbar panels
are the two main panels for creating drawings, the toolbars contain icons for basic draw and modify commands
QUICKCALC
autocad calculator, which can be used to perform a full range of mathematical, scientific, and geometric calculation
polyline
autocad is a 2D line of adjustable width composed of line and arc segment
zoom all command
be as large as possible. if no objects are constructed, the drawing limits are used to adjust the current viewport
explode command
breaks a compound object into its component objects
right mouse button
brings up additional available options. also used to accept the default option of a command, or end a process
center start end arc requires
center point, start point and end point location, in that order
to exit autocad
click the application choose exit autocad from the pull down menu or type QUIT
dynamic input
command interface near the cursor the help the user focus in the graphics area (the advantage is to keep our attention near the cursor
trim
command shortens an object so that is ends precisely at a selected boundary (it cut out an area where it not needed)
OTHO
constrains cursor movement to the horizontal or vertical direction
drawing limits
controls the extents of the display of the grid
offset command
creates a new object at a specified distance from an existing object or through a specified point
to save
ctrl s
world space
designs and drawings created in a CAD system are usually defined and stored using sets of points
autocad 2016
developed by Autodesk Inc, tool used design and drafting activities,
enclosed window selection
direction is form top left to bottom right
2 points
draw a circle based on 2 endpoints of the diameter
center, diameter
draws a circle based on a center point and a diameter
center, radius
draws a circle based on a center point and a radius
3 points
draws a circle based on three points on the circumference
TTT tangent, tangent, tangent
draws a circle tangent to three objects
TTR tangent, tangent, radius
draws a circle with a specified radius tangent to two objects
direct distance entry technique
entering 6.5
fillet
fillets the edges of 2 arcs, circles, elliptical arcs, or lines with an arc of a specified radius
inscribed in circle/ circumscribed about circle
flat to flat or corner to corner
CAD DESIGNS AND DRAWINGS IS THAT THEY SHOULD BE CREATED:
full size - using real world units
pan - realtime
function acts as if you are using a video
where do you find units
in the menu bar under - format
origin
intersection of the three coordinate axes forms a point
quick access toolbar
is located at the top of the autocad window allows us quick access to commands such Qnew, Open, Save, undo
drawing area
is the area where models and drawing are displayed
user coordinate system
is the default of autoCAD, is aligned to world coordinate system
computer aided design
is the process of doing designs with the aid of computers. this includes the generation of computer models, analysis of design data, and the creation of drawings
autocad menu bar
is the pull down menu where all operations of AutoCAD can be accessed
application menu location
is the top of the main window contains commonly used file operations
extend command
lengthens an object so that is ends precisely at a selected boundary
viewport/view/display controls
located at the upper left corner of the graphics area and it can be used to quickly access viewing related commands such as viewport and display style
esc (canceling commands)
located near the top left corner of the keyboard, esc X2 = to cancel a command, esc will exit a command
local coordinate systems (LCS) or user coordinate systems UCS
measured relative to the world coordinate system
when length type to decimal
measurement to the default english units, inches
grid and snap mode
options can be used to get a visual reference as to the size of objects and learn to restrict the movement of the cursor to a set increment on the screen
left mouse button
picks icons, menus, and graphic entities
autocad 2016 measuring angles
positive angular values as counterclockwise form the positive X axis
autodesk exchange
provides a user for help, learning aids, tips and tricks, videos and downloadable apps (displayed at startup)
command prompt area
provides status information for an operation and is is also the area for data input (located below the drawing area)
object snap
quickly draw a line to the center of a circle, the midpoint of a line segment, or intersection of two lines
object snap
quickly draw a line to the center of the circle, the midpoint of a line segment or the intersection of two lines
computer aided engineering
reducing design time, producing prototypes faster, and achieving higher product quality closer to a reality
to close the object
right mouse click and click close
Graphics Cursor or Crosshairs
shows the location of the pointing device in the drawing area, the coordinates are at the bottom of the screen layout
direct distance entry technique:
specify a second point by first moving the cursor to indicate direction and then entering a distance
layout tabs
the model/layout tabs allow us to switch/create between different model space and paper space
status toolbar
the status of many commonly used display and construction options
Ttr tan tan radius
this option allows us to create a circle that is tangent to two objects
cursor coordinates
to switch on the autoCAD coordinates display, located in the bottom right corner
layers control toolbar panel
toolbar panel contains tools to help manipulate the properties of graphical objects
ribbon tabs and panels
top section of the screen layout contains customizable icon panels, which contain of buttons that allow us to pick commands commands quickly
relative polar coordinates (format: @Distance<angle):
type a distance and angle relative to the last point
relative rectangular coordinates (format: @X,Y)
type the X and Y coordinates relative to the last point
absolute coordinates (format: X,Y)
type the X, Y coordinates to locate the point on the current coordinate system relative to the origin
every object we construct in a CAD system is measured in
units
interactive method
use the cursor to select on the screen
world space
usually a 3D cartesian coordinate system that the user cannot change or manipulate
Zoom all command
will adjust the display so that all objects in the drawing are displayed to be as large as possible
repeat circle
will repeat the last command
geometric modelers object are located and defined in what is usually called
world space or global space
