17ME46A Computer Aided Machine Drawing syllabus for ME

INTRODUCTION TO COMPUTER AIDED SKETCHING

Review of graphic interface of the software. Review of basic sketching commands and navigational commands. 2 Hours

Sections of Solids:

Sections of Pyramids, Prisms, Cubes, Tetrahedrons, Cones and Cylinders resting only on their bases (No problems on, axis inclinations, spheres and hollow solids), True shape of section. 4 Hours

Orthographic views:

Conversion of pictorial views into orthographic projections of simple machine parts with or without section. (Bureau of Indian Standards conventions are to be followed for the drawings), Hidden line conventions, Precedence of lines. 4 Hours

Thread forms:

Thread terminology, sectional views of threads. ISO Metric (Internal & External), BSW (Internal and External), square, Acme and Sellers thread, American Standard thread.

Fasteners:

Hexagonal headed bolt and nut with washer (assembly), square headed bolt and nut with washer (assembly) simple assembly using stud bolts with nut and lock nut. Flanged nut, slotted nut, taper and split pin for locking, counter sunk head screw, grub screw, Allen screw. 8 Hours

Keys and Joints:

Parallel, Taper, Feather Key, Gib head key and Woodruff key

Riveted joints:

Single and double riveted lap joints, Butt joints with single/double cover straps (Chain and zigzag using snap head riveters).

Joints:

Cotter joint (socket and spigot), Knuckle joint (pin joint) for two rods.8 Hours

Couplings:

Split muff coupling, Protected type flange coupling, Pin (bush) type flexible coupling, Oldham’s coupling and Universal coupling (Hook’s Joint). 6 Hours

Limits, Fits and Tolerances:

Introduction, Fundamental tolerances, Deviations, Methods of placing limit dimensions, Types of fits with symbols and applications, Geometrical tolerances on drawings, Standards followed in industry. 3 Hours

Assembly Drawings: (Part drawings shall be given)

1. Plummer block (Pedestal Bearing)

2. Rams Bottom Safety Valve

3. I.C. Engine connecting rod

4. Screw jack (Bottle type)

5. Tailstock of lathe

6. Machine vice

7.Lathe square tool post 15 Hours

Course outcomes:

• Sections of pyramids, prisms, cubes, cones and cylinders resting on their bases in 2D
• Orthographic views of machine parts with and without sectioning in 2D.
• Sectional views for threads with terminologies of ISO Metric, BSW, square and acme, sellers and American standard threads in 2D.
• Hexagonal and square headed bolt and nut with washer, stud bolts with nut and lock nut, flanged nut, slotted nut, taper and split pin for locking counter sunk head screw, grub screw, Allen screw assemblies in 2D
• Parallel key, Taper key, and Woodruff Key as per the ISO standards in 2D
• single and double riveted lap joints, butt joints with single/double cover straps, cotter and knuckle joint for two rods in 2D
• Sketch split muff, protected type flanged, pin type flexible, Oldham’s and universal couplings in 2D
• assemblies from the part drawings with limits ,fits and tolerance given for Plummer block, Ram bottom safety valve, I.C. Engine connecting rod, Screw Jack, Tailstock of lathe, Machine Vice and Lathe square tool post in 2D and 3D

TEXT BOOKS:

1. ‘A Primer on Computer Aided Machine Drawing-2007’, Published by VTU, Belgaum.

2. ‘Machine Drawing’, N.D.Bhat & V.M.Panchal, Published by Charotar Publishing House, 1999.

3. ‘Machine Drawing’, N.Siddeshwar, P.Kannaih, V.V.S. Sastri, published by Tata Mc.Grawhill, 2006.

REFERENCE BOOKS

1. “A Text Book of Computer Aided Machine Drawing”, S. Trymbakaa Murthy, CBS Publishers, New Delhi, 2007.

2. ‘Machine Drawing’, K.R. Gopala Krishna, Subhash publication.

Internal Assessment:20 Marks

Sketches shall be in sketch books and drawing shall through use of software on A3/A4 sheets. Sketch book and all the drawing printouts shall be submitted.

Scheme of Evaluation for Internal Assessment (40 Marks)

(a) Class work (Sketching and Computer Aided Machine drawing printouts in A4/A3 size sheets): 20 Marks.

(b) Internal Assessment test in the same pattern as that of the main examination: 20 marks.

Scheme of Examination:

Two questions to be set from each Part A, part B and Part C.

Student has to answer one question each from Part A, Part B for 15 marks each and one question from Part C for 50 marks.

Part A 1 x 25 = 25 Marks

Part B 1 x 25 = 25 Marks

Part C 1 x 50 = 50 Marks

             Total = 100 Marks

INSTRUCTION FOR COMPUTER AIDED MACHINE DRAWING

1. No restriction of timing for sketching/ computerization of solutions. The total duration is 3 hours.

2. It is desirable to do sketching of all the solutions before computerization.

3. Drawing instruments may be used for sketching.

4. For Part A and Part B, 2D drafting environment should be used.

5. For Part C 3D part environment should be used for parts assembly drawing and extract 2D views.