4.5.1 Wood Work Paper 1 (445/1)
SECTION A (40 marks)
Answer all the questions in this section.
1 (a) State four causes of accidents when using a cold chisel. (2 marks)
(b) State the minimum entry requirement for each of the following courses:
(iii) craft. (1 1/2 marks)
2 (a) Outline the procedure of reading a micrometer. (2 marks)
(b) State four uses of a scribing block. (2 marks)
3 (a) Use sketches to show the length of each of the following rivets:
(i) countersunk head;
(ii) round head;
(iii) raised countersunk. (3 marks)
(b) Use labelled sketches to show two uses of a template. (3 marks)
4 Name a suitable material and state the property that makes it appropriate for making each of the following:
(a) twist drill bit;
(c) head of ball pein hammer;
(d) kitchen knife blade. (4 marks)
5 (a) With reference to ﬁling explain:
(i) the term pinning;
(ii) how pinning is prevented;
(iii) how pinning is treated. (3 marks)
(b) (i) Use a labelled sketch to show the safe edge of a ﬁle.
(ii) State the function of the safe edge of a ﬁle. (2 marks)
6 (a) State two advantages of a leg vice over engineer’s vice. (2 marks)
(b) Outline the procedure of locating the centre of a round bar using the centre head and the rule of a combination set. (2 marks)
7 (a) State two forms in which ﬁller metal for brazing is manufactured. (1 mark)
(b) Give one reason for manufacturing ﬁller metals in different forms. (1 mark)
8 (a) Explain the term welding. (1 mark)
(b) State two advantages of rightward welding over leftward welding. (2 marks)
9 Describe the process of oil blanking as applied to metal ﬁnishing. (3 marks)
10 Figure 1 shows an oblique drawing of a block.
Sketch in third angle projection the three orthographic views of the block. ( 5 1/2 marks)
SECTION B (60 marks)
Answer question 11 and any other three questions from this section.
Candidates are advised to spend not more than 25 minutes on question 11.
11 Figure 2 shows orthographic views of a machined block drawn in third angle projection.
On the grid paper provided, draw the isometric view of the block taking X as the lowest point.
Show three leading dimensions. (15 marks)
12 (a) Figure 3 shows a link to be made of 6 mm thick mild steel. Outline the procedure of making the link naming all the tools required in each step. (6 marks)
(b) (i) Sketch a pop rivet and label its parts.
(ii) List three steps involved in preparing work pieces for pop riveting.
(iii) With the aid of sketches, outline the procedure of pop riveting. (9 marks)
13 (a) Sketch an anvil and label three parts. (3 marks)
(b) Figure 4 shows a portion of an arm bar made from a 6.0 mm square mild steel rod.
(i) Determine the length of the material required to form the bend labelled l.
(ii) With the aid of sketches, outline the procedure of making the arm bar. (11 1/2 marks)
14 (a) Use sketches to show the difference between a lap joint and a flush lap joint. (2 marks)
(b) Outline the procedure of sweating as applied to soft soldering and name all the tools and materials required in each step. (8 marks)
(c) Give four safety precautions to be observed when soldering. (2 marks)
(d) State three reasons why copper is preferred in making head of a soldering iron. (3 marks)
15 (a) Sketch a gas welding torch and:
(i) label ﬁve parts;
(ii) state three precautions to be observed when handling it. (7 1/2 marks)
(b) (i) Use labelled sketches to show the three types of gas welding ﬂames.
(ii) Explain how each of the ﬂames is obtained. (7 1/2 marks)
22.1 Metal Work Paper 1 (445/1)
1. (a) CAUSES OF ACCIDENTS
Failure to hold chisel ﬁrmly
Failure to use goggles
Using chisel with mushroomed head
Using blunt chisel
Failure to hold work piece ﬁrmly
Grieared chisel .
Any 4 x 1/2= 2 marks
(b) ENTRY REQUIREMENT
(i) ARTISAN KCPE
(ii) DIPLOMA KCSE (C Plain) or Craft certiﬁcate
(iii) CRAFT KCSE (D Plain) of Artisan
2. (a) READING MICROMETER
Read the whole number on barrel/ sleeve
Read complete subdivision on barrel
Read number on thimble before datum line
divisions coinciding with datum line
Finding the centre of the round bar.
(b) SCRIBING BLOCK
Testing roundness/concentricity 4 X 1/2= 2 marks
(b) Marking + appropriate sketch
Checking + sketch
Guiding + sketch All) 3 X 1= 2 marks
4. (a) Twist drill I-ISS/HCS Hardness and wear resistance
(b) Rivet MS, Alminium, Brass, Copper Malleability/ductility
3x % =17; marks‘
4 x y2= 2 marks
3x l=3 marks
;? ¢ ‘;\r z 2: a i. ‘i 3?" =
l l mm tealmlnz ﬁg
Hammer head Medium Carbon Steel Toughness/hardness
Knife blade Stainless steel Non-corrosive/hardness/easy to
8 x y2= 4 marks
(i) Clogging of a ﬁle by metal chips
(ii) Applying chalk on the surface
(m) Cleaning using a ﬁle card or wire brush
3 x 1= 3 marks
in sm um "2 Marks
Kllmvs filing one surface of a shoulder or inner corner lg mark
Allows ﬁling one surface of a shoulder or inner corner yz
Enhanced rigidity hence withstands heavy blows
Capable of opening more hence holds Wider work piece
Withstands very high temperatures Any 2 x l= 2 marks
Slide the rule through the slot in the centre head and lock. Hold the centre head against
the end of the bar
Scribe a line across the end of the bar
Rotate the bar and scn'be another line to obtain a centre of intersection/bar
4 x }§= 2 marks
Rod, wire, strip, powder Any 2 x %=
T0 cater for - thickness of material being brazed
- the design of the joint
- method of heating the metal
Any 1 x l= 1 mark
The process of joining metals by heating them to melt and fusing together.
Deeper penetration and faster
Rate of cooling is reduced hence better results
Less gas is used
No berel is required for steels up to 8.0 mm thus less ﬁller metal required/used..
Any 2 x1= 2 marks
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9. OIL BLACKING
Clean the surface
Heat to red hot
Dip in clean thick oil
Heat again to
Allow to cool
bum excess oil
Clean the surface
12. (a) (i)
9 faces a,§ , Hi
Hidden details = Q
3'dAngle projection = )5
TOTAL = $15 marks
Scribe the centre line using a scriber
Step off the 75mm hole centres using dividers
Dot punch hole centres using hammer and punch
Scribe 18mm radius using dividers and rule
Scribe 25mm radius using rule and dividers
Join 18mm and 25mm radii tangentially using rule and scriber
Drills holes Q 18 and Q 25 using a drill bit.
Cut along the outline using a hacksaw
File the outline smooth using a ﬁle.
6 x }§= 3 marks
6 x l= 6 marks
www nanny-Inli-much!-Q coin
Erjfu §@€@§'m° Ear-‘1~§m@=@§ g
(b) (i) POP-RIVET
H h c a :3
»-_» ta old y
Sketch and labelling = 211 marks
Mark and drill the plates
Debur the plates
Align the holes 3x V2: 1% marks
(m)I nsert the rivets into the work piece and grip the pin with the rivet gun.
Press the gun to pull the pin causing the head to expand the body.
Continue pressing the gun until the pin breaks off.
3 x l= 3 marks
Any 2 sketches X 1= 2 marks
13. (21) ANVIL
MQVH. Fanning ale
S’ ' Huuﬁo kale
Ta an '“'
""' sum» = 2
Label1ing(3x 1: 1*
TOT“ = 31h marks
(b) (i) LENGTH OF MATERIAL
Inner radius 18
Outer radius 18 + 918 + 3)y,
Mean radius Q = 21
Length of curvature = 1 4 X /Z = 2 marks
= (2 X L X 21) X g
(ii) RADIUSED BEND
Obtain a suitable template/jig for Q 36 or R18
Mark the area to be bent
Heat the area to be bent
Clamp Work piece against the jig
Bend to shape.
5 x % = 2 7; marks
? z \=\7 1 2: as <1. '1 37' = l
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