ENGINEERING GRAPHICS AND DESIGN
PAPER 2
GRADE 12
NSC PAST PAPERS AND MEMOS
NOVEMBER 2016
INSTRUCTIONS AND INFORMATION
QUESTION 1: ANALYTICAL (MECHANICAL)
Given:
Three views of a trigger mechanism assembly, an enlarged view, a parts list, a title block and a table of questions. The drawings have not been prepared to the indicated scale.
Instructions:
Complete the table below by neatly answering the questions, which refer to the accompanying drawings and the title block. [30]
QUESTIONS | ANSWERS | ||
1 | What was Francu's responsibility? | 1 | |
2 | What drawing method was used to prepare the drawings? | 1 | |
3 | What scale is indicated for the drawing? | 1 | |
4 | What should all the unspecified radii be? | 1 | |
5 | What material is used to manufacture the striking pin? | 1 | |
6 | Name the type of finish at A. | 1 | |
7 | Name the type of finish at B. | 1 | |
8 | What is VIEW 3 called? | 1 | |
9 | Determine the complete dimensions at : C: | 3 | |
10 | How many parts make up the trigger mechanism assembly? | 1 | |
11 | What is the purpose of the enlarged view at F? | 1 | |
12 | How many surfaces need to be machined? | 1 | |
13 | What direction of lay must be applied to the machined surfaces? | 1 | |
14 | What is the screw thread specification of the stud nut at G? | 2 | |
15 | With reference to the tolerance, determine the maximum height of the feature at H. | 2 | |
16 | Referring to the parts list, identify the part at J. | 1 | |
17 | In the space above the parts list(ANSWER 17), complete the view of the trigger plate by neatly constructing R10 fillet. SHOW ALL CONSTRUCTION. | 3 | |
18 | In the space below (ANSWER 18), draw , in neat freehand, the convention for a coll spring. | 3 | |
19 | In the space below (ANSWER 19), draw, in neat freehand, the symbol for the projection system used. | 4 | |
TOTAL | 30 |