Machine Drawing Lab Manual

Sub Code: 12034

Unit 1:
Introductions – need for sectioning – Hatching – Inclination of hatching lines – Spacing between hatching lines – Hatching of larger areas – Hatching of adjacent parts – sketch and explanation of full section, Half sections – types, Partial or local sections, Revolved or super unposed sections, Removed sections and offset sections.

Unit 2:
Introduction – Definition of various terms used in limits – Hole basis system – Shaft basis system – Types of fits – Selection of fits and applications – types of tolerances – form and position – Indication of tolerances and fits on the drawing.

Unit 3:
Introduction – Types of keys – taper keys – Parallel or feather keys – wood druff keys – Empirical relation between diameter of the shaft and width & thickness of key for the above types of keys. Definition – Nominal surface – roughness – waviness – lay – productions methods and surface quality – symbol for lay – Indication of surface roughness for various machining operations.

Unit 4:
Introduction – Nomenclature of screw threads – Basic profiles and forms of screw threads – Left hand and right hand threads – Internal and external threads – Drawing of Vee and square threads – Application of threads – Bolts and Nuts – Drawing of Hexagonal bolt and Nut – Drawing of square head bolts – Riveted head – Types.

Unit 5:

1. Auto cad Theory and Practice
2. Sleeve and cotter joint
3. Socket and spigot cotter joint
4. Gib and cotter joint
5. Knuckle joint
6. Flange coupling – protected type
7. Universal coupling
8. Bushed bearing
9. Plummer block
10. Swivel bearing
11. Simple eccentric
12. Machine vice
13. Screw Jack

Auto CAD Theory and Practice :

1. Introduction – open-save-save as-exit-Limits, Units-Line command-Abs coordinate System-Relative Polar-Different toolbars in screen-explanation
2. Draw commands-Circle-Arc-Ellipse-Rectangle-Spline-pline-Donut
3. Editing Commands-Array-mirror-break-copy-rotate-chamfer-fillet-move-offset-scale-trim-extend-strecth-plineedit-pedit-xplode.
4. Display commands-Zoom-pan-oops-regen-viewres.
5. Layer – Properties-create Layer-laytrans-matchprop
6. Text Command-text-mtext-textedit-mtedit
7. Dimensioning commands- DimLinear, Dimaligned, Dimradius, Dimdia, Dimangular, Dimbaseline, Dimcontinuous, Dimstyle, Dimedit
8. Make BLOCK, Insert block, Divide, Measure, Bhatch Attdef, attedit Pagesetup, Plot preview, plot 

Text Books:

1. N. D. Bhatt, Machine Drawing, Edn. 37, Charotar Publishing House, Opp. Amul Dairy, Court Road, Anand 388 001, India – 2002.
2. K. R. Goplakrishnan, Engineering Drawing, Dhanalakshmi Publishers, M97-B, 30th Cross Street, 7th Avenue, Besant Nagar, Chennai 600 090.
3. R.C.Parkinson, Engineering Drawing published by English University Press, London – 1986.

Reference Book:
A. C. Parkinsan, A First year Engineering Drawing. First Rep 1982, A.H. Wheeler & Company (P) Ltd., 15, L. B. Shastri Marg, Allaghabed – 211 001.