Engineering Drawing
Dimensions of Regular Drawing Sheets Designation Dimensions A0 841 mm x 1189 mm A1 594 mm x 841 mm A2 420 mm x 594 mm A3 297 mm x 420 mm A4 210 mm x 297 mm A5 149 mm x 210 mm The size of drawing board: 45x60cm/60x75cm The largest permissible size for a dimension is known as upper limit Plan section specification is necessary for making an estimate Representative fraction (RF) is defined as Length of an object in the drawing / Actual length of the object In an aligned system of dimensioning, the dimension may be read from Bottom or right hand edges. Comparative scale is a pair of scale having a common length of scale Hatching line are drawn at 45° to reference line Method of surveying considering Geometric survey. UCS – Universal Co-ordinate System Polar Co-ordinate system is mostly used in AutoCAD for Angular lines ...
