Computer Aided Design is generating drawings for manufacture in a Computer environment. This has certain advantages not least the acceleration of drawing production especially when a copy of a component, assembly or modification is required.

One of the neatest features about CAD is the ability to make changes on one component then this is automatically updated through the system revising all associated drawings using this element.

• Components can be machined straight from the files created by these systems.
• Visualisation of components in 3D space and or in realistic surroundings.
• Table driven components e.g. A component can be associated to an Excel spread sheet then, by changing the spread sheet, the component will redraw itself creating an output drawing correctly on a company drawing sheet in a matter of seconds.
• A potential product can be tested for its stress, strain, thermal, vibration, fluid dynamic and Hydrostatic properties without any actual manufacture e.g. 223d can tell you how your boat will float and at what LCB (Longitudinal Centre of Buoyancy) and LCG (Longitudinal Centre of Gravity). We can also simulate extreme conditions and show where there is likely to be a problem or a potential weakness.

• Initial cost of set up equipment, Software, and training.
• High employee costs
• High maintenance for software. 3D software is one of the fastest developing industries and it is not unheard of for systems to be updated on a 3 monthly basis.
• Problems with compatibility. Many major software systems create standard files that are illegible by other systems (there is an old saying "standards are great because every one can have one").

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