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Bachelor of Engineering (Honours) in Mechanical Engineering Exam - Summer 2007, Exams of Manufacturing Systems Design

National Institute of Industrial EngineeringManufacturing Systems Design

An exam paper for the manufacturing engineering module of the bachelor of engineering (honours) in mechanical engineering degree at cork institute of technology. The exam covers topics such as fits and tolerances, geometric tolerance, cnc milling, material testing, grinding, and joining processes. Students are required to answer five questions within a 3-hour time limit.

Typology: Exams

2012/2013

Uploaded on 03/28/2013

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Cork Institute of Technology
Bachelor of Engineering (Honours) in Mechanical Engineering -
Stage 1
(NFQ - Level 8)
Summer 2007
Manufacturing Engineering
(Time: 3 Hours)
Instructions Examiners:
Mr. B. O' Callaghan
Attempt FIVE questions Prof. M. Gilchrist
Mr. P. Clarke
Q1. (a) In Fits and Tolerances, what is meant by the terms deviation and tolerance?
(4 marks)
(b) What is the difference between the unilateral hole basis and unilateral shaft basis?
(4 marks)
(c) A fit is specified as H9 - e9 using the unilateral hole basis system. Specify the same
fit using the unilateral shaft basis system. Using a basic size of 100mm, write down
both limits of size for the shaft and hole in each case. (Note a table for the hole basis
system is given at the end of the exam paper)
(6 marks)
(d) A housing is to be bored out for a 50mm outside diameter roller bearing. Name and
designate the fit to be used, giving values for the upper and lower limits of size of the
housing. Why did you choose fit? (6 marks)
pf3
pf4

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Cork Institute of Technology

Bachelor of Engineering (Honours) in Mechanical Engineering -

Stage 1

(NFQ - Level 8)

Summer 2007

Manufacturing Engineering

(Time: 3 Hours)

Instructions Examiners: Mr. B. O' Callaghan Attempt FIVE questions Prof. M. Gilchrist Mr. P. Clarke

Q1. (a) In Fits and Tolerances, what is meant by the terms deviation and tolerance? (4 marks)

(b) What is the difference between the unilateral hole basis and unilateral shaft basis? (4 marks)

(c) A fit is specified as H9 - e9 using the unilateral hole basis system. Specify the same fit using the unilateral shaft basis system. Using a basic size of 100mm, write down both limits of size for the shaft and hole in each case. (Note a table for the hole basis system is given at the end of the exam paper) (6 marks)

(d) A housing is to be bored out for a 50mm outside diameter roller bearing. Name and designate the fit to be used, giving values for the upper and lower limits of size of the housing. Why did you choose fit? (6 marks)

Q2. Fig Q2 shows a stepped shaft with four concentric diameters and a flange that must run true with the datum axis. Illustrate how you would set up this shaft to check its geometric tolerance. Indicate where you would place dial gauges and what the maximum acceptable reading would be in each case. (14 marks)

State the appropriate precautions when assembling and dismantling a stack of slip gauges in order to insure maximum accuracy and minimum wear. (6 marks)

Fig Q

Q3. (a) In CNC milling, there is a feature called cutter radius compensation. Explain how this feature works. What are the advantages of using this feature? (8 marks)

(b) Write a CNC programme to machine the part shown below. Start by drilling the four holes then proceed to machine the profile. When machining the outside profile using the 8mm slot drill, start at the lower left hand corner and machining in a clockwise direction. Use a clearance plane of 1mm, and the material is 4mm thick. (12 marks)

Note: T01 = 6mm slot drill T02 = 8mm slot drill Fig Q