JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Pre-requisites

Engineering graphics

Course objectives: To familiarize with the standard conventions for different materials and machine parts in working drawings. To make part drawings including sectional views for various machine elements. To prepare assembly drawings given the details of part drawings.

Course Outcomes:

• Preparation of engineering and working drawings with dimensions and bill of material during design and development. Developing assembly drawings using part drawings of machine components.
• Conventional representation of materials, common machine elements and parts such as screws, nuts, bolts, keys, gears, webs, ribs.
• Types of sections – selection of section planes and drawing of sections and auxiliary sectional views. Parts not usually sectioned.
• Methods of dimensioning, general rules for sizes and placement of dimensions for holes, centers, curved and tapered features.
• Title boxes, their size, location and details - common abbreviations and their liberal usage
• Types of Drawings – working drawings for machine parts. Drawing of Machine Elements and simple parts Selection of Views, additional views for the following machine elements and parts with every drawing proportion.
• 1. Popular forms of Screw threads, bolts, nuts, stud bolts, tap bolts, set screws.
• 2. Keys, cottered joints and knuckle joint.
• 3. Rivetted joints
• 4. Shaft coupling, spigot and socket pipe joint.
• 5. Journal, pivot and collar and foot step bearings. Drawing of Machine Elements: Using Computer aided drafting in addition to manual drawing Assembly Drawings: Drawings of assembled views for the part drawings of the following using conventions and easy drawing proportions.
• 1. Steam engine parts – stuffing box, cross head, Eccentric.
• 2. Machine tool parts: Tail stock, Tool Post, Machine Vices.
• 3. Other machine parts - Screw jack, Connecting rod, Plumber block, Fuel Injector
• 4. Valves - Steam stop valve, spring loaded safety valve, feed check valve and air cock. Assembly Drawings: Using Computer aided drafting in addition to manual drawing

NOTE

1. First angle projection to be adopted.

• 2. All the drawing components/Assembly to be drawn using any Computer aided drafting package

TEXT BOOKS:

• 1. Machine Drawing / N.D. Bhatt / Charotar
• 2. Machine Drawing with Auto CAD / Goutham Pohit, Goutam Ghosh / Pearson

REFERENCE BOOKS:

• 1. Machine Drawing by / Bhattacharyya / Oxford
• 2. Machine Drawing / Ajeet Singh / Mc Graw Hill

Note

- External examination is conducted in conventional mode and internal evaluation to be done by

both conventional as well as using computer aided drafting.