UTILITY BOX
This utility box is made out of MDF (Medium Density Fibreboard) and after being cut is glued and pinned together using wooden dowel.
Due to the thickness and makeup of the box, accuracy in marking out, cutting and drilling for assembly is paramount and to aid this we will be using a number of jigs and fixtures.
Using A3 paper, a rule and sharp pencil you are to draw each piece half size, apart from the dowels which will be twice full size, fully dimensioned and in three dimensions, so that anyone could make each piece from your detailed drawings without seeing the finished article.
The A3 paper should have a coloured margin of 20 mm, your name in the bottom right hand side of the paper, with letters centralised exactly 16mm high and in a box 20mm high and as long as necessary. The title “UTILITY BOX”, also in a similar box at the top middle of the paper. Each piece should be numbered using the same numbers as my assembly drawing on the back of this sheet.
The dowel pins will be made from soft wood and will be diameter 3mm. You will be making these utilising a dowel plate and there will be a demonstration how to produce these dowels during one of the lessons. There are 10 altogether. Only draw 1 twice full size and state “Twice full size”, and “10 Off”
The dowel MUST go through the edge of two of the side pieces (Part Number 1) to a depth of about 15mm and line up EXACTLY with the longer two side pieces, hence they should either be drilled together or using the drilling jigs manufactured purposely for this job.
These two smaller side pieces are identical, so you only need to draw one of them and state “Two Off”. They will be 50mm wide by 200mm long and made from 6mm MDF. Accurate marking out for holes must be shown, indicating distance apart and diameter, not distance from edge.
The longer side pieces are 300mm in length, also 50mm wide and 6mm thick. The locating holes must be placed exactly 10mm in from each edge and you are to calculate what distance apart so that the assembly produces a box with capacity to hold goods 200mm square maximum. They are drilled of course, all the way through to line up exactly with the holes drilled in the ends of the other side pieces and 3mm diameter, to accommodate the dowel for assembly.
One of these longer side pieces is cut back by the thickness of the door, also made from 6mm MDF. The ends are curved radius 50mm You need to draw a three dimensional view of each piece, correctly dimensioned and numbered Part Number 2 and 3.
The back board (Part number 5) is made of 3mm hardboard and fits exactly the completed box. (Please take into consideration the thickness of the sides for your dimensioned drawing).
The door is pivoted using 3mm dowel and again should be drilled 20mm deep. The edge of this door must be curved to allow the door to pivot open and I suggest a 1mm clearance from the hinged edge and around the top and bottom of the upper and lower side pieces, but flush with the open edge when fully closed. There is a finger hole in the door diameter 20mm, centralised and 25mm from the edge.
Each piece must be drawn to the scale indicated and correctly dimensioned and numbered as shown on the assembly.
Marking scheme
Border and lettering 10 marks.
Each part (1 to 6) 10 marks each.
Correct dimensioning and protocol 20 marks.
Numbering and mentioning scale of each piece 10 marks.