Computer Aided Drafting(CAD) lesson 1-3, Schemes and Mind Maps of Computer Aided Design (CAD)

Download Computer Aided Drafting(CAD) lesson 1-3 and more Schemes and Mind Maps Computer Aided Design (CAD) in PDF only on Docsity! 1 Lesson 1 – STEPPING INTO AUTOCAD Unit 1: Understanding the AutoCAD Window Overview: This lesson will help the students to create diverse kinds of drawings and designs. It helps designers create their designs much more quickly than by hand and offers, many quick, easy, and useful features, such as copy and paste. Learning Objectives: After completion of this lesson, you should be able to: 1. Use Toolbars, Functions Keys, and Status Bar in proper way. Course Materials: When you start AutoCAD, it contains elements that will help you create basic designs as long as you understand the use of every one of them. This illustration shows the main parts of the AutoCAD Window: 2 References: https://www.designtechcadacademy.com/knowledge-base/introduction- autocad#:~:text=AutoCAD%20was%20formally%20launched%20in,and%203D%20models%20using%20c omputers. https://static.sdcpublications.com/pdfsample/978-1-63057-191-7-2.pdf Unit 2: Exercises Using Line Overview: This lesson will help the students to create shapes using the Command Line. Learning Objectives: After completion of this lesson, you should be able to: 1. Understand the elements you will use to create basic drawings. Course Materials: Exercise 1: Using Line with Ortho Mode Command : L← First Point : pick pt. A Next : pick pt. B Next : pick pt. C Last Point : pick pt. D Command : C← Exercise 2: Using Different Selection Methods Like:  Last Select the most recently created object. Command : E← Command : L← Command : ← Command: OOPS -restores objects erased by the last ERASE command. 5 Lesson 2 - AUTOCAD COORDINATE SYSTEM Overview: This lesson will give the students to understand different types of coordinate and some of drawing tools. Learning Objectives: After completion of this lesson, you should be able to: 1. Specify a point by entering its X and Y values; 2. Specify a point by entering a distance and an angle; and 3. Understand what are the use of Osnap and Polar Mode Course Materials: Absolute Coordinate Absolute Coordinate are based on the UCS origin (0, 0) which is the intersection of the X and Y axes. Use absolute coordinates when you know the precise X and Y values of the point. With dynamic input, you specify absolute coordinates with the # prefix. For Example: Command : L← Next : 10,10 (or pick any point) Next : 80,10 Next : 80,50 Next : 60,30 Next : 10,30 Command : C← 6 Relative Coordinates Use relative coordinates when you know the location of a point in relation to the previous point. To specify it, precede the coordinate values with an @ sign. For Example: Command : L← Next : 0,0 (or pick any point) Next : @70,0← Next : @0,40← Next : @-20,20← Next : @-50,0← Command : C← Relative Polar Coordinates Use relative coordinates when you know the location of a point in relation to the previous point. To specify it, precede the coordinate values with an @ sign. Specify a point by entering a distance and an angle relative to the last point in the format. For Example: Command : L← Next : 60,30 (or pick any point) ← Next : @50<180°← Next : @20<270°← Next : @70<0°← Next : @40<90°← Command : C← 7 Direct Distance Entry With direct distance entry, you can quickly specify a point relative to the last point you entered. At any prompt for a point location, you move the cursor first to specify the direction, and enter a numeric distance. For Example: Command : L← Next : 60,30 (or pick any point) Next : ←50← Next : ↓20← Next : →70← Next : ↑40← Command : C← Polar Tracking and Snap Polar tracking restricts cursor movement to specified angels. PolarSnap restricts cursor movement to specified increments along a polar angle. When you create or modify objects, you can use polar tracking to display temporary alignment paths defined by the polar angles you specify. 10  RAY Creates semi-infinite lines commonly used as construction lines. A ray has a finite starting point and extends to infinity.  XLINE (XL) Creates infinite lines, which are commonly used as construction lines. b. CURVES  CIRCLE (C) Creates with a specified radius and tangent to two objects. 11  REVCLOUD Creates a polyline of sequential arcs to form a cloud-shaped object.  DONUT (DO) Draws filled circle with filled.  SPLINE (SPL) Creates a quadratic or cubic spine curve.  ELLIPSE Creates an Ellipse or an elliptical arc. 12  ARC Creates an arc. A B c. SPECIAL OBJECT  RECTANG (REC) Rectang command draws rectangular object. The two specified points determine the diagonal corners of a rectangle with sides parallel to the X and Y axis.  POLYGON (POL) Polygon command draws 2D polygons with 3 to 1024 sides.  HATCH Fills an enclosed area or selected objects with a hatch pattern, solid fill, or gradient fill. It acts as one unit, unless when it’s exploded.