Week 9: CAD Flashcards
CAD stands for
Computer Aided Design
Definition of CAD
The use of computer software for visualising, designing and creating technical drawings of 2 dimensional and 3 dimensional objects or plans
CADD stands for
Computer aided design and drafting
Approach to creating a paper drawing
- Draw out title block
- Layout drawings
- Construction lines to build
- Create drawing at a specific scale
- Add dimensions
- Add annotations
- Populate title block
Applications of CAD include
- Product design (allows collaboration and quicker cycles of redesign than on paper)
- Fashion design - shoes
- 3D printing design - prototyping products
- 3D printed prosthetics
- CNC manufacturing
- Building inventory management - 3D project design
When was CAD software released
Early 1980s
CNC manufacturing stands for
Computer network control
Abilities of CNC
Create designs for manufacturing such as printed circuit boards and rapid prototyping for design
Digital manufacturing requires high levels of
Precision (3D printing)
Examples of CAD software packages
- Autodesk
- Bricscad
- Tinker Cad
- Sketch up
- Blender
CAD file formats
- DWG - Drawing file
- DXF - Data exchange file
- DWT - Drawing template file
- STL - Stereolithography
Layers are an organization method for managing
Drawing elements / turn on or off layers to change visualization
Common attributes such as _____ can be set for all entities on layer
Color, line type and line weight
Snaps are a series of tools which allow
The selection of specific parts of a drawing element i.e end of line, centre of circle, intersection
Snaps allow you to click on drawing elements when
The cursor gets close (magnetic interface pulls mouse to snap)
The two different windows for drawing, each having their own scales and rules
Model space and Paper space
Model space attributes
- Real world scale 1:1 and typically in units of metres
- The area where the drawing elements are created
- Can draw in either 2D or 3D
- Can have an absolute real world coordinate system or an arbitrary relative coordinate system
Paper space attributes
- Paper scale, typical scale of 1:1000 in units of millimetres
- Drawing in 2D only
- Set the paper size of the drawing
- Location of title block and annotations
- Where you layout your drawing and decide what scale to display it at based on the properties of the view points created
You can enter _____ space from _____ space but not the other way around
Model, Paper
A GUI interface contains
Toolbars, settings, background color, project units
Selection boxes dragged to the left selects
Everything it touches
Selection boxes dragged to the right select
Everything that is fully enclosed
A single line only has
2 nodes
A polyline has
2 or more nodes
If a polyline closes back on itself, it will create
A polygon
Polygons denote
Dimensions - rectangle
Circles and arcs specify
Center and radius
Constructions are ______ elements
Temporary
Construction lines help by
- Assisting with placing drawing elements
- Create on a separate layer and turned off for final print
Dimensioning is
Specifying an element vs point to point
Dimstyle
Setting up/modifying text and dimension defaults/configurations
Differences between paper space and model space
- Setting up a layout/viewport
- Scaling differences
- Plan annotations
- Printing options (layout window, defined extents, print to PDF)
The purpose of plotting watermarks is for
Education and business
Other scaling objects or components
- Measuring tape (construction lines)
- Move (point to distort, object movement)
- Textures (paint bucket, images)
- Visualization effects (shadows, fog, styles)
