cameroon gce intermediate level manufacturing processes 2

cameroon gce intermediate level manufacturing processes 2

cameroon gce intermediate level manufacturing processes 2

SECTION A
MANUFACTURING TECHNOLOGY
ALL QUESTIONS CARRY EQUAL MARKS, ANSWER ANY THREE
1. Threading is an operation carried out on a lathe machine. You are an intern in a fabrication workshop in Douala,
your are asked by the manager to produce a thread of M12x1,75 on a steel rod S235 of Ø 20 with a length of 45
mm and threaded length is 30mm.
a) Name two type of thread
(2marks)
b) Calculate the turning diameter of M12x1,75 before threading (2marks)
c) Represent on a labelled sketch of the piece in course of machining: your are expected to represent
i) The cutting tool (2marks)
ii) The holding device of the piece (2marks)
d) After the machining of thread the unthreaded side will be welded on a square head nut.
i) Which type of welding process is used?
(2marks)
ii) Give three safety precautions to be taken during welding process. (2marks

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