KCSE 2012 Woodwork Paper 1 with Marking Scheme

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KCSE 2012 Woodwork Paper 2 with Marking Scheme

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SECTION A (40 marks)

Answer ALL the questions from this section in the spaces provided.

1. State four safety measures to be observed while using hand tools in a workshop (2 marks)
2. List two benefits of learning woodwork. (1 mark)
Explain the difference between a compass saw and a keyhole saw. (4 marks)
1. Sketch and label pictorial view of a marking gauge. (4 marks)
2. List the steps required to prepare a timber surface to receive polish (2 marks)
Explain the functions of each of the following parts of a lathe machine:
1. head stock; (1½ marks)
2. tail stock. (1½ marks)
1. With the aid of a sketch, differentiate between the grinding angle and the sharpening angle of a jack plane blade. (2 marks)
2. State four advantages of using a wooden handle on a claw hammer. (2 marks)
1. Differentiate between paring and chopping as used in chiselling. (2 marks)
2. Describe the following terms as used in woodwork:
  1. counter sinking: (1½ marks)
  2. counter boring. (1½ marks)
1. Make sketches to show the following methods of matching veneers:
  1. side to side pattern; (1 marks)
  2. diamond patter. (1 mark)
2. State two safety precautions to be observed while using contact glue. (1 mark)
1. Sketch and label an exploded view of a mitred angle briddle joint (3 marks)
2. State two reasons for considering the direction of the grain before planing a piece of timber. (1 mark)
State two advantages and two disadvantages of using paint on a wooden surface. (4 marks)
Figure 1 shows a wooden block drawn in first angle orthographic projection.

Sketch an isometric view of the block making X the lowest point. (4 marks)

SECTION B (60 Marks)

Answer question ll on A3 paper provided and any other THREE questions from this section in the spaces provided after question 15.

Candidates are advised NOT to spend more that 25 minutes on question 11

Figure 2 shows a pictorial view of a shaped block.
Draw full size, in third angle projection the three views of the block. Insert six major dimensions. Use A3 drawing paper provided. (15 marks)
1. Name two types of saw sets. (1 mark)
2. Figure 3 shows a wooden block with a rebate 45mm width and 15mm depth.
  
  Figure 3
  Outline the procedure of cutting the rebate using a rebate plane (7 marks)
3. Figure 4 shows a wooden tray made of cypress and a 3 mm thick plywood bottom.
  
  Make a cutting list for the finished sizes of the tray. (7 marks)
1. List four items that should be in a First Aid Kit. (2 marks)
2. Figure 5 shows a cupboard lock:
  1. outline the procedure of fixing the lock on the shutter, (7 marks)
  2. list four tools used in the procedure in (b)(i) above. (2 marks)
3. State four characteristics of timber that has been attacked by dry rot. (4 marks)
1. Define conversion of timber. (1 mark)
2. 1. Sketch a cross section of a tree trunk and label the following parts:
    1. cambium layer,
    2. sapwood;
    3. heartwood:
    4. bark (4 marks)
  2. Explain the function of each of the parts in (b)(i) above. (4 marks)
3. Outline the procedure of applying a clear varnish on a wooden surface using a brush. (6 marks)
1. Differentiate between inlaying and overlaying. (3 marks)
2. With the aid of labelled sketches, explain the following methods of cutting veneers:
  1. rotary methods;
  2. plain slicing. (8 marks)
3. State two faults that occur on doors hung with butt hinges and give one cause of each fault. (4 marks)

MARKING SCHEME

1. Safety measures while using hand tools
  - Keep the work under control by holding it firmly with the vice or clamps so that both hands are free to guide the tool.
  - Do not use dull tools, they can slip and cause accident.
  - make certain that handles are securely fastened on planes, hammers and files.
  - Do not blow dust or chips off the work from the mouth of the plane.
  - Always cut away from your body when using a knife or chisel.
    Any 4 x ½ = (2 marks)
2. Benefits of learning woodwork.
  - Able to repair and maintain wooden items.
  - Able to construct wooden items/furniture.
  - Create job after school/employment.
  - For leisure.
    Any 2 x ½ = (1 mark)
Saw differences
- Keyhole - has a narrow and shorter blade - 300 mm long and has ten(10) teeth per 25 mm.
- Compass - has a wider and longer blade 360 mm long with eight (8) teeth per 25 mm.U
1. Sketching a marking gauge
2. Steps required in surface preparation
  - Smoothen the surface.
  - Sand
  - Fill and raise the dents
  - Sand
    4 x½ = (2 marks)
Functions of parts of a lathe
1. Tail stock
  - supports the work by means of the cone shaped centre
  - to drill holes by means of a taper shank drill inserted in the hollow spiddle. 1x½ = (1½ marks)
2. Head stock
  - carries the top set of pulley wheels
  - accommodates the driving centre which rotates on the work.
1. Grinding angle/sharpening angle
2. Reasons for using wooden handle
  - It provides a good grip
  - It is light in weight
  - It absorbs shock
  - Does not generate too much heat due to friction
    Any 4 x ½= (2 marks)
1. Paring chopping
  - Paring is the act of cutting thin sizes of wood either across or along the grains of wood using a paring chisel. (1 mark)
  - Chopping is cutting across the grain to make an opening to cut a mortise to receive a tenon using a mortise chisel. (1 mark)
2. 1. Counter sinking - act of enlarging an already existing hole to accommodate wood screw head and bolts
  2. Counter boring - done on top of a shank to receive a countersunk or raise head screw.
1. Matching of veneers
2. Safety precautions when using contact glue
  - keep away from fire as it is highly flammable.
  - use nose mask mto avoid inhaling
  - ensure it does not come into contact with the body and cloth.
    Any 2 x ½= (1 marks)
1. Exploded corner bridle joint
2. Reasons for considering direction of grain
  - Planing along the grains is easy
  - Surface of wood becomes rough if planed against the grains
  - The wood tears up and chokes the plane if planed against the grains.
    Any 2 x½ = 1 mark
Advantages and disadvantages of using paint
1. Advantages
  - Hides defects
  - Gives a uniform colour
  - Variety of colours
    Any 2 x 1 = (2 marks)
2. Disadvantages
  - Does not expose timber texture
  - Does not give a high class finish
  - Not absorbed by timber cells and may peel off
    Any 2 x 1 = (2 marks)
Isometric view of block
Elements
Front elevation 5 x ½ = 2½ mark
end elevation 3 x ½ = 1½ mark
Plan 6 x ½ = 3 mark
Hidden details 3 x ½ = 1½ mark
Dimensioning any 6 x ½ = 3 mark
Correct intepretation =1½marks
Neatness =1 mark
Centre line =1 mark
Total = 15 marks

Types of saw set
- Plier type ½ mark
- notch type ½ mark
- Mark the pieces to the required sizes of rebate
- Set the plane to the required width
- Set the required depth
- Fix the pieces of timber on the vice/or hold the piece firmly on the bench
- Start planing the rebate using slight strokes
- Make full strokes until you reach to the required depth
- Ensure uniform pressure is applied throughout (7 marks)

Item	Descritpion	No.				Materials
			L	W	T
1	Side pieces	2	400	50	20	Cypress
2	End pieces	2	300	100	20	Cypress
3	Bottom piece	1	400	300	3	Plywood

(7 marks)

1. Items for a first aid kit
  - Bandages
  - Scissors
  - Antiseptics
  - Cotton wool
  - Pain killer
  - Razor blade
    Any 4 x½ = 2 marks
2. 1. Procedure of fixing lock
    - Mark the position of the lock
    - Mark the position of the key hole
    - Make recess for the lock
    - Drill the key hole
    - Extend the key slot using the key hole saw
    - Locate the position of the lock screws
    - Make pilot holes for the screws using the oval brad awl
    - Fix the lock using the screws (7 marks)
  2. Tools used for fixing lock
    - try square
    - Marking gauge
    - pencil/ cutting knife
    - hand drill/brace
    - keyhole saw
    - screw driver
    - Brad awl
      Any 4 x ½ = (2 marks)
3. Characteristics of timber with dry rot
  1. Smell - a distinct mushroom like odour (damp and musty)
  2. Distorted wood surface - warped, sunken (concave) and/or with shrinkage cracks. Tapping with a hammer produces a hollow sound, and the wood offers no resistance when pieced with a knife.
  3. The appearance of fruiting bodies (sporophores) in the form of a plate(skin) or "bracker'.
  4. The presence of fine rust-red dust, which is the spores from a fruiting body.
    1 x 4 = (4 marks)
1. Conversion definition
  - Sawing of logs of wood to marketable sizes. (1 mark)
2. 1. Cross-section of a tree trunk:
    Showing parts
  2. Function of parts
    - Bark - Protect the inner parts of a tree against: - extreme temperature changes - insects, fungi and animal attack - moisture evaporation from the tree
    - Cambium layer - develops cells that form the bark
    - Heart wood - storage for waste products, provides support for the tree
    - Sap wood - Conveys water and mineral salts from the roots to the leaves
      4x1 = (4 marks)
3. Procedure of applying a varnish
  1. Prepare surface seal grain with thin coat of shellac if required.
  2. Apply first coat of varnish thinned to the correct consistency using long strokes of the brush along the grain.
  3. Dry for 18 - 24 hours, sand along the grain lightly with No. glass paper and dust off.
  4. A second coat is applied and allowed to dry for 24 - 48 hours.
  5. The workpiece is sanded as in step three above using sand paper No. 400 waterproof dry paper.
  6. A third coat is applied and allowed to dry for 24 - 48 hours.
    6x1 = (6 marks)

Inlay is a method used in decorating furnisher by embedding wood or other kind of material on the surface of wood i.e. making recess while overlaying is the method of decorating wood furnisher by gluing ornamental shapes made of wood, metal or plastic on to the surface of an article. (3 marks)
1. Rotary method
  - rotate softened log in a peeling lathe
  - strong and sharp knife fed into log till log is a perfected cylinder.
  - continuous sheet of veneer is peeled from log.
2. Plain slice method
  - cut log into a square or rectangular section.
  - secure timber to a machine bed.
  - slice veneers by passing knife back and forth.

	Fault on a door	Door not closing
1	Door not closing	(i) Recess too shallow (ii) Protruding screwheads
2	Door leaf not fitting	Recess too deep
3	Leaf slamming onto the frame Any 2 x 1 = 2 marks	Hinge recesses not of the same depth Any 2 x 1 = 2 marks