2 / 12 / 2012 CAE Lab.Computer Aided Engineering Drawing 3 Standards Paper Sizes The ISO most recommended paper sizes for technical drawings are known as A-FORMATS. Other series, like the B-Series, are of lesser importance. In the A-Format series, the largest size is A0. The size of an A1 paper is half the size of A0 while A2 is half the size of A1 and so forth.. For technical drawings A4 is considered to be the smallest paper size. Smaller-sized AFormat papers (i.e. A5, A6, etc) are very rarely used for technical drawings.
2 / 12 / 2012 CAE Lab.Computer Aided Engineering Drawing 4 The A-Format Paper Sizes When a format smaller than A4 is needed, it is obtained by simply halving A$ along its longer side. For instance A5 has 210-mm as its longer side and (297/2 = 148- mm) as its shorter side.. Format A4 is exclusively used in an upright position. The other formats (which are lager in size than A4) may be used in an upright position or horizontal position.. Sheet mmFormat 841 X 1189A0 594 X 841A1 420 X 594A2 297 X 420A3 210 X 297A4 ………….
2 / 12 / 2012 CAE Lab.Computer Aided Engineering Drawing 5 Title Block In every engineering drawing, a Title Block is included at the bottom (right-hand corner). The Title Blocks are locally standardized but should be designed in such a way that it can be easily understood. The information needed in any standard Title Block is normally:.
2 / 12 / 2012 CAE Lab.Computer Aided Engineering Drawing 7 Basic Instruments and Equipment T-Square This is one of the oldest drawing instruments that still finds wide spread use both in the industry and in schools. The size of a T-Square is determined by its blade length. Blade lengths of 60- mm, 90-mm, 120- mm and 150-mm are common. USES: The T-Square is used primarily as a guide for drawing horizontal parallel lines.
2 / 12 / 2012 CAE Lab.Computer Aided Engineering Drawing 8 Set Square Set Squares (SSs) are transparent, triangular-shaped drawing instruments that are used with a T-Square for drawing vertical or inclined lines. SSs contain angles most commonly used in technical drawing, i.e. 30, 45, 60 and 90. The height/length of SSs is typically 15-cm, 20-cm, and 25-cm.
2 / 12 / 2012 CAE Lab.Computer Aided Engineering Drawing 11 Line Types In Engineering Drawing, we make use of different lines and line styles to convey the desired message. These lines differ in (i) thickness and (ii) style. Typical uses of these lines are summarized below.
2 / 12 / 2012 CAE Lab.Computer Aided Engineering Drawing 13 Starting AutoCAD 2002 a) from the Windows ‘Start screen’ with a double left-click on the AutoCAD 2002 icon b) by selecting the windows taskbar sequence:: Start-Programs-AutoCAD 2002-AutoCAD 2002 Both methods briefly display the AutoCAD 2002 logo and then the AutoCAD 2002 Today screen/dialogue box as Fig,.
2 / 12 / 2012 CAE Lab.Computer Aided Engineering Drawing 14 The Graphics Screen The AutoCAD 2002 graphics screen displays the following: 1 The title bar 9 The coordinate system icon 2 The ‘windows buttons’ 10 The drawing area 3 The menu bar 11 The on-screen cursor 4 The Standard toolbar 12 The grips 5 The Object Properties toolbar13 Scroll bars 6 The Windows taskbar 14 The Layout tabs 7 The Status bar 15 The Modify toolbar 8 The Command prompt window area 16 The Draw toolbar