cameroon gce intermediate level 2024 engineering drawing 2

cameroon gce intermediate level 2024 engineering drawing 2

cameroon gce intermediate level 2024 engineering drawing 2

TOPIC: HOLE PUNCHER
I. SETTING-UP
The drawing represented on page 3 is a hole puncher or paper puncher. It is an office tool that is used to create
holes in sheets of paper, often for the purpose of collecting the sheets in a binder or folder.
II. DESCRIPTION AND FUNCTIONNING
The operator applies a force F to the lever i, which rotates on the fulcrum 4. The rotation of the lever _1 causes the
translation of the punch 2 on the body 5. During the process the punch 4 creates the hole on the paper. After the
operator releases, spring 3 brings back the lever l to its initial position.
SECTION A
TECHNOLOGICAL STUDY (20 MARKS)
Question 1: Identification and functioning of parts (5 marks)
1.1 Give the type of motion between part 4 and 1_
1.2 Indicate the reference of components in the exploded drawing
1.3 State the function of part 3_
1.4 Justify the V form at the end of the operating punch 2

Question 2: linkages (5 marks)
2.1 Identify the type of link between the following pieces: 4_and 1., 2 and 5
2.2 Tick three characteristics of link between 1 and 4
(2 marks)
(3 marks)
Question 3: Knowledge of materials and designation of elements (5 marks)
3.1 Identify the material from which part 5 is made.
3.2 Choose the standard designation of the screw 7 amongst the following: HM 6–10, CHc M 6–10,
CS M6–10, FTM6–10
3.3 State the role of piece 7
3.4 Give the name and role of part 3
(1 mark)
(1 mark)
(1 mark)
(2 marks)
Question 4: Fits and Tolerances (5 marks)
The fit between part 2 and 5_is|< >16H7g6. Given that
016 H7 = 0165+0.018
4.1 Calculate the maximum allowance 016^6 = 016—0.017 0.006
4.2 Calculate the minimum allowance
4.3 Deduce the type of fit
4.4 Justify your answer

QUESTION 5: Functional dimensioning (5 marks)
5.1 Plot the chain of dimensions related to the clearance a

SECTION B
GRAPHICAL STUDY (30 MARKS)
On A4H pre–printed paper in the answer sheet, to scale 1:1 with pencil and instruments complete the definition
drawing of part 10 in:
• Front view section A–A
• Left end view
• Top view