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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 2 Repeat Examinations 2009/
Module Title: Manufacturing Technology
Module Code: MECH 7007
School: Mechanical & Process Engineering
Programme Title: Bachelor of Engineering Mechanical Engineering(Hons)
Bachelor of Engineering Manufacturing Engineering
Programme Code: EMECH_8_Y 4 EMECH_7_Y
External Examiner(s): Mr. A. Bateman, Dr. E. Ahearne
Internal Examiner(s): Mr James Calvey
Instructions: Answer Question 1 and 2 other questions.
Duration: 2 hrs
Sitting: Autumn 2010
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator.
Q1 – Compulsory
(a) Define the term MACHINABILITY. (4 Marks)
(b) The following data was obtained from a cutting test:
.d^ .f^ l 1 l 2 Fa Fv 20 o^90 o^4 mm 0.25mm/rev 30 mm 11 mm 425 N 1000 N
Use Merchants analysis to calculate: (i) The magnitude and direction of the resultant force (5 Marks) (ii) The shear plane angle (5 Marks) (iii) The friction force (5 Marks) (iv) The coefficient of friction (5 Marks)
(c) Explain what is meant by the term “Tool life”. (4 Marks)
(d) In the context of centerless grinding what is lobing and what can be done to prevent its occurrence? (8 Marks)
Q2. (a) Calculate for a 36T gear of 5mm module and 20 degree pressure angle:- (i) Plug size (ii) Distance over plugs places in opposite spaces (iii) Distance over plugs spaced 10 teeth apart. (12 Marks)
(b) List 5 measurement techniques used to determine whether or not individual gear tooth elements are manufactured to specified tolerances and describe ONE method in detail. (8 Marks)
(c) Describe in detail the process of gear hobbing. (6 Marks)
(d) What is the advantage of the constant chord method over the Pitch line method of gear tooth thickness measurement? (6 Marks)
