Year 9 Metal TECHNICAL DRAWING BSI logo KITE Mark Logo CE logo Who are the BSI?: The British Standards Institution (or BSI), is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services, and also supplies certification and standards-related services to businesses. They make sure that when a new product is designed and built, it is built to the correct safety standard and is safe. E.g. they make sure a chair will hold a specific weight etc. This is done in the form of British Standards which all products sold legally in the UK have to follow. KITE Mark Logo What is the Kite Mark?: The KITE mark is a sign that a product has met all of the required BSI safety standards and is printed on a product to represent this. It is only awarded by the BSI and has to be displayed on all product sold in the UK which is a legal requirement CE logo What is the CE mark?: The letters "CE" are the abbreviation of French phrase "Conformité Européene" which literally means "European Conformity". This means that the product meets all of the European safety standards and it has to be displayed on all products sold within the European Union as a legal requirement. If a product fails the European safety standards it cannot display this logo and cannot be sold Lion Mark What is the Lion Mark?: The Lion Mark is truly a consumer symbol. It means that consumers can be assured that a toy which bears the Lion Mark has been made by a member who believes in making good quality, safe toys. A Technical Drawing is created so that the person building the product has all of the details needed to begin manufacturing it. It is laid out the same across the whole of Europe so that each engineer and designer can understand each other work and there is no confusion. The picture below shows a technical drawing of a product. The drawings are laid out in 2-D and sometimes have 3-d drawings if the product is really complex. The way the drawings are laid out if called ORTHOGRAPHIC PROJECTION and can either be 1st angle or 3rd angle projection, in Europe we use 3rd angle projection which is represented using the symbol below Measurements are added to the technical drawing using arrows and numbers TOLERANCE When a product is manufactured in large numbers by batch or continuous production it is almost impossible to ensure that each individually finished product is exactly the same. Each finished product may look the same but there will be very small differences. The digital vernier caliper is a very accurate measuring device. The details of the scale of the drawing, the tolerance that the part has to be made to and the material details are included on the drawing

JOINING TECHNIQUES There are lots of different methods for joining materials together, we don’t just glue things. It all depends on the type of material, the forces involved when the product is in use and how much money the final product will be sold for. The information below explain all of the different methods for joining different materials together MATERIAL DESCRIPTION JOINING METHOD GLUING/ ADHESIVE Adhesives work on several different principles. There are many specialist adhesives manufactured for specific purposes. Glue is a permanent way of joining materials and varies in strength WOOD, POLYMER, FABRIC NUTS AND BOLTS There are numerous variations on these systems of joining. Threads are sometimes cut into one piece of material. Bolts are made with various different heads. Threads also vary although metric are now almost standard in schools M3-M12 being the most popular. Wing nuts are tightened by hand and hexagonal heads using a spanner WOOD, POLYMER, METAL RIVETING Rivets are a more permanent joining method than nuts and bolts. Rivets work on forming a head on both sides of the materials being joined. The traditional method is to hammer the blank end of the rivet to form a second head. Pop riveting is the most common method today METAL, SOLDERING Soft soldering is a method of joining metal parts together using a lead based alloy. Flux is applied to the joint and heated using a gas torch or metal soldering bit. Soft soldering is used for light application such as electrical connections and plumbing joints KNOCK DOWN FITTING There are a massive range of knock-down fittings available and they are used on commercial products so that there is no need to create a permanent joint which takes skill and effort. WOOD BRAZING Brazing is used for heavier applications as the joint is much stronger. The brass alloy melts at a much higher temperature than soft soldering. This method is most commonly used for joining steel but can be used on copper WELDING Welding involves heating metal together melting a pool of metal to bond each surface. There are three types Gas, MIG and Spot welding. Welding is used for very heavy application such as boats, cars and building. The temperature is very hot and the process is dangerous and highly skilled. NAILS/SCREWS Nails are used to create a very week joint in the ends of wood. Screws can be combined with glue and can provide a strong hold if used across the grain. Screws are used with a screw driver and can be removed