THEME: BENCH GRINDING MACHINE

 

I- SETTING-UP

The drawing assembly on the Appendix 1/2 represents a Bench grinding machine used in the manufacturing workshops. Its functions are to execute Machine Finishing Process on work pieces and sharpen machine tools in order to obtain good Finished Surfaces.

II- DESCRIPTION AND FUNCTIONING

The machine body 1 is made of cast iron which carries all the parts of the machine. The power is transmitted through part 3 to part 2 and the grinding wheel is mounted on part 2 with the help of part 19, 16, 17, and 18.

SECTION A

TECHNOLOGICAL STUDY (20 marks)

QUESTION 1: IDENTIFICATION AND FUNCTION OF THE PARTS. (4 marks)

1.1 Name the following parts: 19, 3, 6 and 4. (0.5 x 4 = 2 marks)

1.2 Give the function of the following parts: 19, 3, 6 and 4. (0.5 x 4 = 2 marks)

QUESTION 2: KNOWLEDGE OF MATERIALS /4 marks

2.1 In which family of material do the following parts 1, 2 and 20 belong? (0.5 x 2 = 1 mark)

2.2 The shaft 2 is made from 40Cr Ni Mo 6-12. Decode this designation. (3 marks)

QUESTION 3: LINKAGES /4 marks

3.1 From the knowledge of linkage, identify the type of link between parts 2 and 3; 2 and 1. (0.75 x 2 = 1.5 marks)

3.2 Give three characteristics of the link between parts 2 and 3. (0.5 x 3 = 1.5 marks)

3.3 Indicate the number of degree of freedom permitted by each link: 2 and 3; 2 and 1. (0.5 x 2 = 1 mark)

QUESTION 4: DESIGNATION OF FASTENERS (4 marks)

4.1 Give the standard designation of the following parts: 19 and 8. (1.5 x 2 = 3 marks)

4.2 Give the name of the assembling element used to assemble the machine on the bench. (1 mark)

QUESTION 5: LUBRICATION AND SEALING (4 marks)

5.1 Propose the type of lubrication used in this mechanism. (2 marks)

5.2 Justify your answer. (2 marks)

IL 2025 MECHANICAL DRAWING 2