WoodWork 2, WASSCE (PC), 2016

Question 3

 

(a)       Make a pictorial sketch of a haunched tenon constructed from a piece of timber 18 mm x 60 mm in cross-section.
(b)       Calculate the sizes of the following parts of the haunched tenon sketched in question 4 (a).
(i)         width of tenon;
(ii)        thickness of tenon;
(iii)       length of haunch.

(c)        Use the answers obtained in question 4 (b) to dimension the haunched tenon.

Observation

 

 Very few candidates attempted this question and only one candidate
 performed well.

The solutions to the questions are stated as follow:

 

  1. Pictorial Sketch of a Haunched Tenon

 

(B)Calculations

(I)         Width of tenon  = 2/3 x width of timber
= 2/3 x 60 = 40 mm

(II)        Thickness of tenon   = 1/3 x thickness of timber
= 1/3 x 18 = 6 mm

(III)        dimension the tenon width
-           dimension the tenon thickness
-           dimension the haunch length