DI02000121 · Semester 2 · 5G scheme
Mechanical Drafting
Notes and solutions following the Gujarat Technological University (GTU) syllabus for DI02000121. Independent material — not issued by the university.
Materials
Complete Book
The whole syllabus, unit by unit, written for the exam.
Complete Book
86 pages
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PYQ Solutions
Past university papers, fully solved.
Solved past papers — detailed answers
7 pages · English + ગુજરાતી
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Syllabus units
Unit 1: Introduction
- 1. Concept and need of mechanical drafting. Explain Drawing standards (IS-696 /SP 46).
- 2. Drawing of basic solids like prism, pyramid, cylinder and cone.
- 3. Sectional view of basic solids and their applications.
- 4. Surface development of solids and their uses in engineering field. (Only basic solids and their combinations are to be prepared.)
Unit 2: Sectional orthographic
- 1. Concept of orthographic reading.
- 2. Need of sections, section lines & cutting plane.
- 3. Types and applications of sections- full, half, revolved, removed, partial, off-set, aligned, etc.
- 4. Sectional view drawings from given isometrics drawing / physical object and cutting plane conditions.
Unit 3: Geometric & Dimensioning Tolerances (GD&T)
- 1. Importance of limits and fits, hole basis system and shaft basis system, types of fits, tolerance grade and fundamental deviation.
- 2. Numerical based on limits and fits. (It is compulsory to ask numerical related to Limits and Fits, in Exam.)
Unit 4: Production drawings
- 1. Machining symbol, geometric symbol, weld joint symbols as per BIS-813, supplementary symbols, fluid and pipe fitting symbols, sketches of threads, studs, screws, nut, bolts, rivets, keys, etc.
- 2. Productions drawing including GD&T and drafting symbols of simple mechanical assembly having minimum 5-6 components each made up of various manufacturing operations.
Unit 5: Assembly and detail drawings
- 1. Concept of assembly drawing having 4-5 mechanical parts, drawing of orthographic projections for each component.
- 2. Fundamentals of detail drawing, Bill of Material (BOM) and assembly drawing.
- 3. Demonstrate and explain 1-2 industrial example assembly drawings.
Unit 6: Introduction to CAD software
- 1. Discuss about available software in CAD field and their capabilities
- 2. AutoCAD software window: Title bar, Ribbon tool bar, Quick Access Toolbar, View port, Command prompt, Draw tool bar, modify, UCS, status bar, etc.
- 3. File features: Opening new file, saving file, open drawing.
- 4. Setting up new drawing: Unit, limit, grid, snap, Dynmode, Orthomode, polar, snap, osnap, isodraft, dynamic USC, etc.
- 5. Co-ordinate system in AutoCAD:Absolute & Relative coordinates, Cartesian & Polar coordinates.
- 6. Concept of Layers, Blocks and Hatch with applications.
Unit 7: Dimensioning in Auto CAD and Annotation
- 1. Dimensioning in AutoCAD.
- 2. Dimension types: Linear, aligned, angular, radius, diameter, etc.
- 3. Dimension editing: Adding text, rotating the dimension text.
- 4. Text writing in AutoCAD: Single line, multi-line text.
About this course
The students of mechanical engineering programme are mainly involved in drafting, manufacturing, inspection and planning activities (such as preparing process plans, preparing bill of materials, etc.) at industries. For all such activities, reference document is the drawing of components/assemblies to be manufactured. In this context, it is of utmost priority to prepare, read and interpret these drawings correctly for production of components and assemblies. The industrial practices of drafting are also important for the students to make them aware of drafting practices, symbols, codes, norms and standards generally used in industries. Development of sketching ability also strengthens effective engineering communication & presentation. The advent of computers has made it easier to implement frequent changes as needed. This course has been designed to enhance students' manual drafting skills in alignment with CAD software.