waecE-LEARNING
Woodwork Paper 3, Nov/Dec. 2011  
Questions: 1 2 3 4 Main
General Comments
Weakness/Remedies
Strength

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 




Question 1

(a)        State four precautions to be taken before switching on a machine.
  
(b)        State one function of each of the following parts of a metal jack plane:

(i)         back iron;
(ii)        cap iron;
(iii)       lever (on back iron);
(iv)       knob.
                                                                                                                                   
(c)        State the reason for earthing a portable power tool.

(d)        Sketch a pictorial view of a pair of outside callipers.


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Observation

Most candidates were able to:

  1. state the reason for earthing a portable power tool;
  2. sketch a pictorial view of a pair of outside callipers.

However, they were unable to state the:

  1. precautions to be taken before switching on a machine;
  2. function of the given parts of a metal jack plane.

The expected response to question 1 is as given below:

(a)        Precautions to be taken before switching on a machine:
           
            -           Remove scraps from around the machine and from the floor.
            -           Wear shoes with strong toe caps and insulated soles.
            -           Obtain permission to use the machine.
            -           Put on close fitting overall/apron tied at the back.
            -           Wear “safety glasses”, goggles or eye shields.
            -           Check the setting-up.
            -           Make sure guards are in position and secure.
            -           Check the material for safe use on the machine.

 (b)      Functions of parts of metal jack plane

                      (i)         The back iron

                        -           breaks the shavings;
                      -           deflects the shavings;
                      -           prevents the fibres from tearing-up
                      -           enables a smooth surface to be produced;
                      -           provides tension to the cutting edge and prevents chattering or
                      vibration.

                        (ii)        Cap iron secures the cutter and back iron in the bed.

                        (iii)       Lever:
                                   
                                    -           Lifted or pulled up to release the cutter and cap iron from the bed.
                                    -           Is pressed down to secure the cutting iron and cap iron in place.

                      (iv)       Knob is used for applying downward pressure to the plane with the hand
                      when planing.

 

 

 

 

(c)        A portable power tool is earthed in order to:
                       
                      (i)         protect the operator from electric shock;
                      (ii)        prevent the tool from damage.

  (d)

OUTSIDE CALIPERS

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