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Jss1 Basic Technology

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Jss1 Basic Technology Subject: Basic Technology Class: J.S.S 1 WEEK 1 Topic: Woodwork handtools Tools can be classified into two, that is hand tools and power tools. The power tools are operated with electricity while hand tools are those tools operated without electricity. Therefore, woodwork tools are those tools used on wood. They are also known as manual tools. Woodwork hand tools are classified into the following: measuring tools, setting and marking out tools, driving tools, boring tools, work holding devices, cutting and pairing tools. Measuring tools Measuring tools are caliberated tools dedicated to determine the length of objects. They can be made of metal ,wood and plastic. These measuring tools are: metric rule, calipers and pair of divider etc. Metric rule Metric rule is usually made of wood or steel and plastic. It comes in different lengths such as 150mm and 300mm. Some rulers can be folded. All rulers have a straight edge and are caliberated. Uses of metric rule Rulers are used to measure length, width or breadth of objects. Calipers The following are types of caliper: •Inside caliper •Outside caliper •Odd leg caliper •Inside caliper: They are used to measure the inside diameter of a hole. They measure the inside dimension of any object within their capacity. •Outside caliper: They are used to measure the outside dimension of any object within their capacity. •Odd leg caliper: They are used for central. They are used in locating the center of bars and in taking distance from the edges of holes. Pair of divider Dividers are a two- legged steel instrument used for scribing arcs, circles, curves and for setting off distances. They are made in various sizes. Uses of Divider It is used for transferring measurement from the metric rule to the drawing paper. Micrometre: It is used for taking precision measurement. WEEK 2 Topic: Woodwork hand tools ( Setting and marking out tools) Setting and marking out tools are tools used to set and make marks on wood. Examples of setting and marking out tools are: try square, sliding bevel, mitre square, compass, trammel, pair of divider, marking guage, etc. Sliding bevel Marking guage Pair of compass Trammel Try square The try square is a marking out tool made of a stock and a blade fixed at right angles to each other. Uses of Try square It is used for checking the squareness of edges. It is also used to mark out straight lines Sliding Bevel The sliding bevel is made up of a steel blade and a wooden stock. It can be adjusted and set to any angle. Uses of sliding bevel It is used to mark out lines that cross out at an angle and to check bevels. Mitre Square The mitre square is made up of steel blade and a wooden stock fixed at 45° to each other. Uses of Mitre square It is used for setting out and checking angles at 45° and 135° Pair of Compasses Compases are made of steel. Uses of compass They are used for scribing circles and arcs and marking out distances. Trammel Trammels are made of a combination of both wood and metal. Uses of Trammel They are used for marking out large diametres where compasses cannot serve. Marking Guage The marking gauge is made of wood and a metal pointer Uses of Marking guage It is used to mark off lengths by the action of its nail or iron pin. It is adjustable Pair of Divider A pair of divider is a two-legged marking out instrument made of steel. Uses of divider They are used for describing circles. They are used for decribing arcs. They are used for marking out distances For transferring measurement WEEK 3 Topic: Woodwork handtools (Driving tools) Driving tools are tools meant for driving in or driving out nails and other objects. Examples of driving tools are: hammer, mallet, punch, screw driver, etc. Hammer The hammer is one of the most commonly used of all hand tools. It consist of a metal head and a wooden handle. There are many types of head shapes with a common striking face and special peen for riveting. The head is hardened and tempered. Types of hammer The following are types of hammer: •Straight peen head hammer •Ball peen head hammer •Blocking head hammer •Cross peen head hammer •Plainshing head hammer •Straight peen head hammer It is used for riveting but in an awkward position and other end is used for bending sheet metal. •Ball peen head hammer It is used for general purpose work and the end is used for riveting conical and rivets while the other flat end is for striking. •Cross peen head hammer It is used for riveting in awkward places and the flat end used for striking. •Blocking head hammer It is used by sheet metal workers. The faces are radiused and well polished for shaping sheet metal. •Planishing head hammer It is used for finishing work, because the faces are well polished and free of any defect. Mallet Mallet hammer are called soft hammer. Mallet is generally used where steel hammer are likely to damage the job. The faces of mallets are made of lead, copper, raw hide, wood, plastic or rubber. Uses of mallet Mallet hammer is used when bending or shaping metals without doing any damage to the surface of the metal. It is used on striking the wooden handles of chisel, files etc. Punch Punch is used in woodwork for driving in nails below the surface of the job. It is made from tool steel that is hardened. Types of punch The following are types of punch: •Dot punch •Center punch •Pin punch • Dot punch: The dot punch point is ground at 60° inclined angle. Uses of Dot punch It is used in marking out jobs, for striking small dots on scribed lines. It is also used for locating hole-centres for drilling operations. •Center punch: They are made of cast steel, hardened and tempered. It should be ground on the grinding stone to an angle of 60° at the point. Uses of center punch It is used for marking out line and patterns on metal. It is uses for marking out cents. It is used to drive in nails below the surface of wood, with the aid of hammer. •Pin punch: These are also made from high carbon steel. Uses of pin punch It is used for driving out tapered pins, rivets, cotters, etc. Screwdrivers Screwdrivers are driving tools used either to drive in or drive out screws. Types of screwdriver The following are types of screwdrivers. •Flat screwdriver: They are used to drive e in or drive out screws with slotted heads. •Star screwdriver: They are used for driving screws with star heads in and out. •Allen key screwdriver: It is used on screws with hexagon or square slotted heads. •Offset screwdriver: It is used where the straight or flat screw driver cannot be used. Spanner: It is used for tightening or loosening bolts, nuts, screws, etc. WEEK 4 Topic: Woodwork hand tools (Boring tools) Boring tools are tools used for making or creating holes in wood. The tool is held firm with braces before the boring is done. Examplea of boring tools are : brace, gimlet, bradawl, wood drills, bits, wheel brace, etc. Wheel brace Brace Brace The brace is a tool used for holding and turning the drill bits or twist drill when boring a hole. Types of brace •Plain brace •Ratchet brace The brace has four main parts. •The head •The crank •The ratchet •The chuck •The head: It is screwed to a steel sleeve. It fits over the crank rod and runs on the hardened steel balls. •The chuck: It is rectangular bent metal rod. It fits into the hardwood or plastic handle. •The crank: The end of the crank enlarged, threaded and slotted to receive the socket and jaws. •The ratchet: It is a tool fitted to the ratchet brace so that holes can be drilled (bored) at specific parts that are not exposed, such as corners where it is not possible to make a complete turn of the crank. The ratchet may be set to allow the bit to rotate in one direction either on the forward or return stroke. Wheel brace The wheel brace make the task of boring hole easier. A large number of holes can be bored without exhaustion. Gimlet It is used for creating initial small tools on hardwood before inserting screws or nails. Gimlet have their tips twisted to pull the shaft of the gimlet into the wood. Bradawl A common bradawl has a flat tip like a screwdriver. It performs the same function as gimlet. Bradawl is used manually to bore holes before inserting screws and nails. Wood drill Wood drill is a boring tool used in conjunction with brace. Parts of wood drill: •The tang •The shank •The flute •Cutting tip WEEK 5 Topic: Woodwork hand tools (Work holding devices) Work holding devices are tools used to hold work pieces on the bench. Some of the work holding devices are: bench vice, bench hook, G-clamp, F-clamp, sash clamp, etc. Bench vice The bench vice is fixed to the side of the bench. It is made of cast iron. The bench vice has a release lever which allows quick adjustment and grip. Uses of bench vice It is used for clamping wood in place before working on it. Bench hook The bench hook is made up of two pieces of planed wood fixed on the work bench. Bench hook Uses of bench hook It is used for holding jobs during cutting and chiselling on the bench.
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