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Overview of Computer Aided Design (CAD) | Advantages | Co‐ordinate systems | drawing commands

December 27, 2020 by imBooz Leave a Comment

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  • Four drawing commands are :

 Line: A line is specified by giving its two endpoints. Line command can be used to draw a single line or a series of lines with the endpoint of one being the start point of the next. When a series of such lines is created each line is treated as a separate entity.

 Syntax: LINE or L

 P line: Polylines are interesting drawing entities. Polyline can include both lines and arcs connected at an endpoint. A polyline is a single entity with multiple segments. The polyline can be straight or curved, can be wide or tapered. Curve fittings and hatching can easily be performed on a polyline.

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Syntax: PLINE

  1. Polygon: A polygon is also a polyline with an equal length of sides. The regular polygon can either be inscribed in a circle or circumscribed about the circle. The polygon may also be constructed by specifying the length of one side and the number of sides of the polygon called edges.

 Syntax: POLYGON

  1. Arc: This command is used to draw an arc accurately.

 Syntax: ARC

 There are three parameters required for drawing an arc :

 (I) 3 point arc: The arc is drawing by specifying three-point on the arc.

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 (II) Start center: This option needs the start point and a center point of an arc the third parameter may either be an endpoint, included angle, length of the chord.

 (III) Start, End: This option asks the user to enter the start and endpoints of an arc. The arc is completed by either specifying radius or included angle or center point.

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Filed Under: Engineering Drawing, Technical Articles Tagged With: Advantages of Computer-Aided Design (CAD), Co‐ordinate systems used in CAD, Four drawing commands of CAD, Solid modeling, The fundamental commands to edit a drawing CAD

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