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Eme 2172: Workshop Processes &Amp; Practice I Question Paper

Eme 2172: Workshop Processes &Amp; Practice I

Course:Bachelor Of Science In Tie Engineering

Institution: Dedan Kimathi University Of Technology question papers

Exam Year:2011

1
KIMATHI UNIVERSITY COLLEGE OF TECHNOLOGY
UNIVERSITY EXAMINATIONS 2010/2011
FIRST YEAR FIRST SEMESTER SUPPLEMENTARY/SPECIAL EXAMINATION FOR THE
DEGREE OF BACHELOR OF SCIENCE IN T.I.E. ENGINEERING
EME 2172: WORKSHOP PROCESSES & PRACTICE I
DATE: MARCH 2011 TIME: 2 HOURS
INSTRUCTIONS
i. This examination contains four questions.
ii. All questions carry equal marks.
iii. Answer any THREE questions.
iv. All symbols have usual meaning unless otherwise stated.
QUESTION ONE [20 Marks]
With the aid of well labeled sketches explain how the following processes are carried out using a
center lathe.
i. Forming [4 marks]
ii. Drilling [4 marks]
iii. Facing [4 marks]
iv. Plain turning [4 Marks]
v. Reaming [4 Marks]
QUESTION TWO [20 Marks]
a) Calculate the time taken to face a workpiece of 80 mm diameter. The spindle speed is 90
r.p.m. and cross feed is 0.3 mm/rev. [2 Marks]
b) Calculate the time taken to turn a brass component 60 mm diameter by 84 mm long if the
cutting speed is 50 m/min and the feed is 0.4 mm/rev. Only one cut is to be considered.
Neglect tool approach and tool travel. [2 Marks]
c) List four main reasons why beds in lathe machines are made of cast iron. [5 Marks]
d) With the aid of well labeled diagrams, briefly explain chip formation process.
[5 Marks]
2
e) A 160 mm long, 15 mm diameter rod is reduced to 14 mm diameter in a single pass
straight turning. If the spindle speed is 450 r.p.m and feed rate is 225 mm/min, determine:
(i) Material removal rate (MRR) [4 Marks]
(ii) Cutting time. [2 Marks]
QUESTION THREE [20 MARKS]
a) List seven parameters that affect metal cutting processes. [7 Marks]
b) Briefly explain the following cutting techniques: [8 Marks]
i. Orthogonal cutting
ii. Oblique cutting
c) List five main conditions that promote formation of continuous chips. [5 Marks]
QUESTION FOUR [20 MARKS]
(a) Define the following tool elements: [7 Marks]
i. Shank
ii. Flank
iii. Face
iv. Heel
v. Neck
vi. Nose
vii. Cutting edge
(b) List ten factors affecting tool life. [10 Marks]
(c) A cutting tool, cutting at 22m/min, gave a life of 1 hour between re-grinds when
operating on roughening cuts with mild steel. What will its probable life when engaged
on light finishing cuts? Take ? = 1/8 for roughening and 1/10 for finishing cuts. [3 Marks]

Eme 2172: Workshop Processes &Amp; Practice I Question Paper

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