Fig. 13 shows a knock-down (KD) fitting used to join two panels of a flat-pack bookcase. The product is manufactured in large quantities using industrial pr...
Question 1 Report
Fig. 13 shows a knock-down (KD) fitting used to join two panels of a flat-pack bookcase. The product is manufactured in large quantities using industrial processes. The choice of material is important for the function and appearance of the product. The designer has considered the target market and the product's intended use. It must meet safety standards and be suitable for its intended purpose.
It cuts in a line. The sides are smooth. The base is wide. It can be moved to a new spot.
(a) Name the parts labelled A and B. [2]
(b) State one advantage and one disadvantage of using knock-down fittings compared to permanent joints. [2]
[Total: 4 marks]
Answer Details
(a) Name the parts labelled A and B [2]
- A - Connecting bolt / dowel screw [1]. This threaded fastener screws into the shelf panel and projects downward into the side panel, where it is locked by the cam.
- B - Cam lock / cam fitting / barrel nut [1]. This cylindrical fitting sits in a round hole bored into the side panel. Turning the cam with a screwdriver draws it over the head of the connecting bolt, pulling the two panels tightly together.
(b) State one advantage and one disadvantage of using knock-down fittings compared to permanent joints [2]
Advantage (any one for [1]):
- Furniture can be disassembled and reassembled, making it easy to transport (flat-pack delivery) and to move between rooms or homes.
- No specialist tools are needed for assembly - typically only a screwdriver or Allen key is required.
- No adhesive is required, so assembly is clean and reversible.
Disadvantage (any one for [1]):
- The joint is not as strong as a glued permanent joint (such as a mortise and tenon or dovetail), so the furniture may feel less rigid.
- The fittings can be visible on the surface of the panels, affecting the appearance of the finished product.
- Repeated disassembly can weaken the chipboard or MDF around the fitting, as the hole enlarges and the cam loses its grip.
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