Computer-aided design (CAD) is the use of computers (or workstations) to aid in the creation, modification, analysis, or optimization of a design. This software is used to increase the productivity of the designer, improve the quality of design, improve communications through documentation, and to create a database for manufacturing. Designs made through CAD software are helpful in protecting products and inventions when used in patent applications. CAD output is often in the form of electronic files for print, machining, or other manufacturing operations. The terms computer-aided drafting (CAD) and computer aided design and drafting (CADD) is also used.
Its use in designing electronic systems is known as electronic design automation (EDA). In mechanical design it is known as mechanical design automation (MDA), which includes the process of creating a technical drawing with the use of computer software.
CAD software for mechanical design uses either vector-based graphics to depict the objects of traditional drafting, or may also produce raster graphics showing the overall appearance of designed objects. However, it involves more than just shapes. As in the manual drafting of technical and engineering drawings, the output of CAD must convey information, such as materials, processes, dimensions, and tolerances, according to application-specific conventions.
CAD may be used to design curves and figures in two-dimensional (2D) space; or curves, surfaces, and solids in three-dimensional (3D) space.: 71, 106
CAD is an important industrial art extensively used in many applications, including automotive, shipbuilding, and aerospace industries, industrial and architectural design, prosthetics, and many more. CAD is also widely used to produce computer animation for special effects in movies, advertising and technical manuals, often called DCC digital content creation. The modern ubiquity and power of computers means that even perfume bottles and shampoo dispensers are designed using techniques unheard of by engineers of the 1960s. Because of its enormous economic importance, CAD has been a major driving force for research in computational geometry, computer graphics (both hardware and software), and discrete differential geometry.
The design of geometric models for object shapes, in particular, is occasionally called computer-aided geometric design (CAGD).
Market Harborough is a market town within the Harborough district of Leicestershire, England. It is situated in the far southeast of the county, forming part of the border with Northamptonshire.
Harborough District has a population of 91,461 (2017) and Market Harborough is the district's administrative headquarters. It sits on the Northamptonshire-Leicestershire border. The town was formerly at a crossroads for both road and rail; however the A6 now bypasses the town to the east and the A14 which carries east-west traffic is 6 miles (9.7 km) to the south. Market Harborough railway station is served by East Midlands Railway services on the Midland Main Line with direct services north to Leicester, Nottingham, Derby and Sheffield and south to London St Pancras. Rail services to Rugby and Peterborough ended in 1966.
Market Harborough is located in an area which was formerly a part of the Rockingham Forest, a royal hunting forest used by the medieval monarchs starting with William I. Rockingham Road takes its name from the forest. The forest's original boundaries stretched from Market Harborough through to Stamford and included the settlements at Corby, Kettering, Desborough, Rothwell, Thrapston and Oundle.
The steeple of St Dionysius' Church rises directly from the street, as there is no churchyard. It was constructed in grey stone in 1300 with the church itself a later building of about 1470. Next to the church stands the Old Grammar School, a small timber building dating from 1614. The ground floor is open, creating a covered market area and there is a single room on the first floor. It has become a symbol of the town. The nearby square is largely pedestrianised and surrounded by buildings of varying styles. The upper end of the High Street is wide and contains mostly unspoiled Georgian buildings.
Market Harborough has two villages within its confines: Great Bowden lies over a hill about a mile from the town centre; Little Bowden is less than half a mile from the town centre. The three centres have largely coalesced through ribbon development and infill, although Great Bowden continues to retain a strong village identity.