The document discusses machine drawing conventions and guidelines for creating drawings using AutoCAD. It covers topics like drawing views, dimensions, sections, materials representation, and machine elements. The list of experiments involves drawing various machine parts and elements like screws, bolts, keys, gears, bearings, valves etc using appropriate drawing conventions and views. Dimensioning, sectioning, title blocks and other guidelines are also discussed for creating production and working drawings of machine components.

1. Machine Drawing through Auto CAD
Introduction
P.Bhargavi, Asst.prof, MED, CVRCE

2. List of Experiments
• Introduction to AutoCAD: Getting started with AutoCAD - User
Interface – Standard annotation tool bar – Drawing templates- New File-
save- Ribbon Panel-workspace- Command bar. Tool bars– Status bar –
Display control commands and plotting.
1. Conventional representation of materials, common machine elements
and parts such as Screws, nuts, bolts, keys, gears, webs, and ribs.
(Drawing of Machine Elements and simple parts. Selection of Views,
additional views for the following machine elements and parts with every
drawing proportion.)
P.Bhargavi, Asst.prof, MED, CVRCE

3. List of Experiments
2. Machine Drawing Conventions: Need for drawing conventions – introduction
to IS conventions
b) Types of sections – selection of section planes and drawing of sections and auxiliary
sectional views. Parts not usually sectioned.
c) Methods of dimensioning, general rules for sizes and placement of dimensions for
holes, centers, curved and tapered features.
d) Title boxes, size, location and details - common abbreviations & their liberal usage.
e) 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.)
P.Bhargavi, Asst.prof, MED, CVRCE

4. List of Experiments
3. Popular forms of Screw threads, bolts, nuts, stud bolts, tap bolts, set screws.
4. Keys, cotter joints and knuckle joint.
5. Shaft couplings
6. Journal, pivot and collar and foot step bearings (Plummer block), Riveted joints
for plates
7. Stuffing box, cross heads,
8. Eccentrics, Petrol Engine connecting rod, piston assembly.
9. A) Screws jack, Machine Vices,
B) Tailstock.
10 A) Steam stop valve
B) Feed check valve.
P.Bhargavi, Asst.prof, MED, CVRCE

5. Orthographic Projection
• Projection: Getting an image of the object on
the picture plane when light rays are projected
on it.
• If these rays are perpendicular to plane of
projection and to the object then the image
obtained on the plane of projection is known as
orthographic view.
P.Bhargavi, Asst.prof, MED, CVRCE

6. P.Bhargavi, Asst.prof, MED, CVRCE

7. Contents
• Classification of Drawings
• Types of drawing sheets
• Drawing sheet layout
• Types of lines
• Arrangements of dimensioning & rules.
• Conventional representations of materials &
machine components
• Rules of sectioning
P.Bhargavi, Asst.prof, MED, CVRCE

8. Types of Drawings
Machine Drawing:
It consists of machine parts or components. It is presented through a no.of
ortho views, So that the size and shape of the component is fully understood.
P.Bhargavi, Asst.prof, MED, CVRCE

9. Production Drawing
• It also referred as working drawing, should furnish all the dimensions,
limits, special finishing processes such as heat treatment, honing, lapping,
surface finish, etc., to guide the craft man on the shop floor in producing
the component.
P.Bhargavi, Asst.prof, MED, CVRCE

10. Part Drawing
• Detailed Drawing
of a component to
felicitate its
manufacturing.
P.Bhargavi, Asst.prof, MED, CVRCE

11. Assembly Drawing
• A drawing that shows the various parts of machine in
their correct working locations is an assembly drawing.
• Types of Assembly drawings:
1. Design assembly drawing
2. Detailed assembly
3. Sub- assembly drawing
4. Installation Assembly drawing
5. Catalogue drawing
6. Assembly drawing for
instruction manuals
7. Exploded assembly drawing
8. Schematic assembly drawing.
9. Machine shop drawing
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12. Catalogue drawing
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These drawings show only the pertinent details and dimensions that
would interest the potential buyer.

13. Assembly drawing for instruction manuals
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In order to check all the parts before reassembly and installation else where.

14. Exploded assembly drawing
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Exploded pictorial views are supplied to meet instruction manual requirements.

15. Schematic assembly drawing
• Schematic representation of all the elements of a machine by
their conventional representation.
P.Bhargavi, Asst.prof, MED, CVRCE

16. Machine shop drawing
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Rough castings and forgings sent to machine shop for finishing
operation. Machine shop drawing gives only the information
necessary for machining.

17. P.Bhargavi, Asst.prof, MED, CVRCE

18. Drawing sheet layout
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19. Types of lines
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20. Hidden and axis line techniques
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21. Leader line
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22. System of Dimensioning
• Aligned system
1. Chain
2. Parallel
• Unidirectional system
1. Chain
2. Parallel
• Progressive
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23. System of Dimensioning
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24. Aligned system
Chain dimensioning
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25. Unidirectional system
Parallel dimensioning
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26. Progressive
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27. Dimensioning of Diameter, arc, chord & angles
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28. P.Bhargavi, Asst.prof, MED, CVRCE

29. Method of indicating Notes
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30. • Meaning of notes and Abbreviations
Refer Text book pg.no:36,37,38.
(Text Book Machine Drawing by K.L. Narayan)
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31. Conventional representation of Materials
A mixture of cement,
sand and Gravel
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32. Conventional representation of Machine
components
P.Bhargavi, Asst.prof, MED, CVRCE

33. Conventional representation of Machine
components
P.Bhargavi, Asst.prof, MED, CVRCE

34. Conventional representation of Machine
components
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35. Sections
• In order to see the inner details of a machine
component, the object is imagined to be cut by
a cutting plane and the section is viewed after
the removal of cut portion.
P.Bhargavi, Asst.prof, MED, CVRCE

36. Cutting plane indication
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• Sections are made by cutting planes and are designated by capital letters and
the direction of viewing is indicated by arrow marks.

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38. Hatching of Sections
Hatching of Adjacent
components
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39. Sectioning along two parallel planes
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40. Sections not to be hatched
* Fasteners * Shafts , Ribs
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41. Sections not to be hatched
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42. Sections not to be hatched
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43. Sectional Views
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44. Sectional Views
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45. Sectional Views
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46. Sectional Views
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