Need for Technical Drawing. Classification of Drawings. Principles of Drawing: Drawing Sheet, Scales, Lines, Lettering. Orthographic Projections (Views). Presentation of Views. Designation and Relative Positions of Views. Selection of Views. Sectional Views: Full section, Half Section. Dimensioning. Screwed Fasteners: Forms of Threads, Thread Series, Right Hand and Left Hand Threads. Surface representation and Mechanical Processing: Roughness, Machining Symbols, Indication of Surface Roughness. Introduction to Computer Aided Drawing (CAD) and PC-Lab training.