CAD (Computer Aided Drawing/Drafting) and CAM (Computer Aided Manufacturing) are computer technologies used for mainly product designing and manufacturing purposes where former is used in designing of the product through some designing software while latter involves software for controlling the machines in the industries such as CNC machines.
CAD and CAM are the steps included in the manufacturing of a product. Let us understand the difference between CAD and CAM through the given comparison chart.
Content: CAD Vs CAM
|Basis for comparison||CAD||CAM|
|Basic||CAD is the implementation of digital computers in engineering design and production.||CAM is the implementation of computers in converting engineering designs into finished products.|
|Involved processes||Definition of a geometric model, definition translator, geometric model, interface algorithm, design and analysis algorithms, drafting and detailing, documentation.||Geometric model, interface algorithm, process planning, NC programs, inspection, assembly and packaging.|
|Requires||Design conceptualization and analysis.||Control and coordination of the necessary physical processes, equipment, materials, and labour.|
|Softwares||AutoCAD, Autodesk Inventor, CATIA, SolidWorks||Siemens NX, Power MILL, WorkNC, SolidCAM|
Definition of CAD
CAD (Computer Aided Design) system create accurately, scaled mathematical models based on user input. Individual models are then integrated as components of an assembly to create the final product through which exact fit of the parts can be checked. Fully rendered 3D models of parts and whole assemblies for designs can be created using 3-Dimensional CAD software. Even the created designs can be tested virtually from any angle before manufacturing the product.
Definition of CAM
CAM (Computer Aided Manufacturing) is evolving as a central element in many productions. It includes a broad range of process to be carried out automatically such as cutting, milling, turning, routing, engraving, heat cutting and even printing of solid materials. After designing and analysing a product, it is manufactured where computers are involved in manufacturing like to checking whether the product can be made or made by which process, and how much time it is going take. In simple words computer system used in planning, managing and control the operation of manufacturing plant is called CAM. It reduces material waste by careful positioning of the components.
Key Differences Between CAD and CAM
- Computer-aided design (CAD) involves the use of computers for converting the initial idea of product into a detailed engineering
design. The evolution includes the creation of product’s geometric models, which can further be manipulated, analyzed and
refined. On the other hand, Computer-aided manufacturing (CAM) involves the use of computers for assisting managers, manufacturing
engineers, and production workers by automating production tasks and it also controls machines and systems.
- CAD comprise of processes such as defining the geometric model and translating the definition, interface, design, and analysis
algorithm, drafting, detailing and at last documentation. As against, CAM involves processes such as geometric modelling,
interface algorithms, process planning, numerical control programs, inspection, assembly and packaging.
- The CAM system requires control and coordination of the physical process, equipment, material, and labour whereas CAD requires
product design conceptualization and analysis.
- There is numerous CAD software, for example, AutoCAD, Autodesk Inventor, CATIA etcetera. In contrast, Siemens NX, Power
MILL, WorkNC, SolidCAM are some the examples for CAM software.
Advantages of CAD
- Reduces the need for large numbers of expensive draftsman in designing of a product.
- It can be used directly in order to generate cutting data for CNC machines.
- Scaling, re-scaling modification in drawings and models is easier and automatic and accurate.
- Storage and retrieval of models is easier.
- Design data can be shared in computerised manufacturing management systems.
- Accurate 3D models can be tested before making costly materials.
- It increases the speed of production and requires less labour.
- Multiple copies can be stored, printed and shared electronically, which eliminates the need for storing large paper drawings.
Advantages of CAM
- Manufacturing requires minimum supervision and can be accomplished during unsocial work hours.
- Manufacture is less labour intensive and saves labour cost.
- Machines are accurate, and manufacturing can be repeated consistently with large batches.
- Error occurrence is negligible, and machines can run continuously.
- Prototype models can be made very quickly for detailed inspection before finalising designs for manufacture.
- Machining routines and outcomes can be evaluated with virtual machining on screen.
Disadvantages of CAD
- Power cuts and viruses can be problematic for the computerised system.
- Industrial versions of the software could be very expensive to buy especially for the startup costs.
- Traditional drafting skills will be lost as they become unnecessary.
- Expensive training would be required to use the software, which can be time-consuming and costly.
Disadvantages of CAM
- It requires high initial investment and start-up cost.
- Machine maintenance is also costly.
- May result in loss of a workforce with high-level manual skill.
- To ensure correct tooling and set up procedures it needs highly trained operatives and technicians.
Computer aided designing/drafting (CAD) and Computer-aided manufacturing (CAM) are closely related terms used where computers are involved in the design and manufacturing processes of a product in CNC industries.