Machine Drawing

SATHYABAMA UNIVERSITY

(Established under section 3 of UGC Act, 1956)

Course & Branch: B.E - Mechanical / Mechanical& Production/

Aeronautical 

Title of the paper: Machine Drawing

Semester: III                                                               Max. Marks: 80     

Sub.Code: 15307(2002/2003/2004/2005)/6C0067            Time: 3 Hours

Date: 06-05-2008                                                         Session: AN      

                                                PART – A                       (30)

Answer All the Questions

1.     A steel pin having a normal diameter of 30mm is to be an easy running fit in the bore of a bronze bush. Sketch free hand         indicating the limit dimensions for the steel pin and the bore of the bush.                                                                                  (10)

2.     Draw the three views of ISO threaded hexagonal bolt 150mm     long, 24mm diameter and a thread length of 60mm with a    hexagonal nut. Indicate all the proportions and the calculated      dimensions.                                                                             (10)

3.     Sketch the symbols for the following characteristics used for      form tolerances

(a) Symmetry                  (b) Perpendicular            (c) Coaxiality (d) Straightness            (e) Circularity.                                (5)

4.     Sketch the conventional representation for the following machine         elements.

        1. External threads

        2. Helical torsion spring

        3. Disc spring

        4. Bevel gears

        5. Rack and pinion                                                                  (5)

PART – B                       (1 x 50 = 50)

Answer All the Questions

5.     The detail of a screw jack is shown in the figure. Assemble the   parts of the jack and draw the following views of the assembly.

       

1. Front view in half section.

        2. Top view.