CAD – Computer Aided Design CNC – Computer Numerical Control CAM – Computer Aided Manufacture.. CAD Computer Aided Design CAD is used in the design phase to create plans, test plans and
Trang 1CAD – Computer Aided Design CNC – Computer Numerical Control CAM – Computer Aided Manufacture.
CAD Computer Aided Design
CAD is used in the design phase to create plans, test plans and to generate 3D models CAD is used for many purposes from designing towns to
kitchens.
CAD systems require a:
8 computer with fast processor and large memory
8 graphics tablet
8 plotter
8 CAD software package.
Advantages of CAD
1. Alterations to plans don’t require redrawing.
2. 3D virtual reality models of CAD plans can be computer generated, so allowing designers to view plans.
3. The software automatically checks the design meets any rules eg all parts must fit together without gaps.
Highly Skilled Technical Drawer 2D CAD Package Design 3D CAD Package Design
Accurate drawings take:
· a great deal of skill
· a long time to create plans
· many drawings have to be created to
see the object from different angles
· time to get perfect, each change
requires redrawing.
Accurate drawings are less difficult:
· lines can be shortened, lengthened, deleted or rotated at the click of a mouse button.
· so changes to designs can be tried out very quickly to see the effect
· designs can be rotated and viewed from different angles.
3D CAD designs give non specialists a better idea of the final design.
Trang 2CAM is the use of computers to control the production process. Equipment
in CAM systems is controlled using CNC ( Computer Numerical Control)
Equipment controlled CNC will be perfect to a fraction of a millimetre, unlike humans.
CAM Process
Advantages of CAM
1. Production is faster than older methods.
2. Consistent quality of output.
3. Waste can be minimised.
4. Fewer workers are required so associated costs are reduced.
CAD Design is created into a control program.
CAM process is setup with equipment etc.
CNC controls equipment.
Trang 3Take your time to read over the notes.
Answer the following questions.
1. What do the initials CAD, CNC and CAM stand for?
2. Is CAD software or hardware?
3. Explain 2 advantages of using CAD
4. What do you think might be a disadvantage of using CAD?
5. Explain the difference between a plotter and a graphics tablet.
6. Explain what CAM can be used for.
7. Explain 2 advantages of using CAM rather than a person?
8. What do you think is a disadvantage of using CAM?
9. Explain what is CNC.
10. Explain an advantage of using CNC rather than a person?
11. Use the Internet to research CAD and CAM. Write down two extra
facts about each that you have discovered.
8 CAD
8 CAM
8 CNC
Fun Things To Do
Use the IKEA kitchen CAD package to design a kitchen.
You will find the executable file in the folder:
P:\Computing\Secondary\CAD \
Try the tutorials on http://www.arcad.com/