Toolmakers' Theory N2 — Document
April 2021 — N2 — Toolmakers' Theory
N2
2021
Nated Engineering
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4.3ormula or manipulation thereof Substitution of the given data in the formula nswer with the correct SI unit 5.
Q1— Section header —
1.5\in the ANSWER BOOK.
1.1the jaws should be aligned and have proper claw grooves for gripping. it is acceptable if the handle covers are off. the pliers can be placed with chemicals after finishing
1.2When working with a drilling cuttings can lie around everywhere. ensure that the spindle is turning in the correct direction for the work to be done. clean the table with your hands.
1.3can withstand friction. breaks before the shaping of its form. changes shape permanently.
1.4have softer material where the pressure takes place. allow for maximum manpower to move the clamp. require the minimum effort to clamp a workpiece properly in the minimum amount of time.
1.5gauge can be used taper plug limit gap taper rin
Q2— Section header —
2.1State THREE safety precautions to take when working with a milling machine in the toolmakers' workshop. (3\
2.2Give THREE examples of personal protective equipment (PPE\used in toolmakers' workshop. (3\
2.3State TWO precautions to take when using a hammer. (2\
2.4Why do you have to wash your hands after working and before you eat? (1\
2.5Who may enter the workshop? (1\ [10] +-.///-,* ,/24455421/-+ &$" 10
Q3— Section header —
3.1Name the TWO forms of carbon in cast iron steel. (2\
3.2Define the term alloy (1\
3.3Give the main characteristics of each of the following metals when combined with steel:
3.3.1Nickel
3.3.2Vanadium
3.3.3
3.4shaft must be turned to transmit a huge amount of power. State which type of material should be used and g ive a
3.5Name the type of material used to make each of the following tools and give the characteristics of the steel type
3.5.1Reamers
3.5.210
Q4— Section header —
4.1Explain the Rockwell ardness testing method. (3\
4.2How can the hardness of a flat piece of material be determined with a Vickers ardness ester?
Q5— Section header —
5.1Define each of the following:
5.1.1Basic size
5.1.2Negative tolerance
5.1.3
5.2Make a drawing of a screw thread and label its FOUR components. (4\ .3 Draw a diagram of a imit
Q6— Section header —
6.1Calcula te the minimum number of Johansso n gauge blocks of a M50 set re quired to draw a diameter of 81 4275 mm. U se 2
6.2A sinus bar of 250 mm is supported by a table at an angle of 3 15' Determine the height difference of one roller. (5\
6.3Draw a diagram to show how toolmaker buttons are set up. (5\ [15]15
Q7— Section header —
7.1Name TWO characteristics to consider when a plug gauge is manufactured. (2\
7.2If a gauge is under extensive friction and wear when used, which material can be considered for the manufacturing of the gauge? (1\
7.3Draw a neat, labelled diagram of a gauge manufacturing process. (5\ [8]8
Q8— Section header —
8.1Give a short description of a carbide throw away tip cutting tool. (2\
8.2Show, by means of THREE drawings, a positive angle, straight angle and negative angle on lathe cutting tools. (3\
8.3Explain the preparation process to mount a car bide tip onto a cutting tool shaft. (5\ [10]10
Q9— Section header —
9.1Explain each of the following Wimet tool grades:
9.1.3
9.2Where could each of the following be used?
9.2.1Aluminium oxide grinding wheel
9.2.25
Q10— Section header —
10.1Make a neat, labelled drawing of a drill. (5\
10.2State TWO important criteria to consider when grinding a spiral drill. (2\ [7]7
Q11— Section header —
11.8\n the ANSWER BOOK.
11.1A hammer needs a wedge to keep the head firmly in position.
11.2When cutting mild steel, a hacksaw blade with 24 teeth per 25 mm must be used.
11.3An advantage of a centre lathe is that it can cut a hexagon.
11.4When drilling a hole of 50 mm, the speed should be 500 r/min for the spindle.
11.5A c lamp jig is designed to hold the workpiece in a movable position.
11.6Tempering can be used to get rid of the brittleness in the steel after hardening.
11.7gas oven will be installed to get more heat from the oven for the hardening of steel
11.88
Q12— Section header —
12.5\n the ANSWER BOOK. 12 .1 The user sh ould check if he/she ha
Mark Allocation
Total100 marks
Sections5 + 10 + 10 + 5 + 10 + 15 + 8 + 10 + 5 + 7 + 8 + 7 = 100 marks
Paper information
TitleDocument
SubjectToolmakers' Theory
LevelN2
Document typeQuestion paper
Year2021
MonthApril
Pages6
Downloads3
Examination context
Decade2020s
Years ago5y
SeasonAutumn (SH)
Start dayThursday
Exam periodApril 2021
Days since exam2,019
About Toolmakers' Theory examination preparation
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