f. 1 design and technology woodwork try square try square is for woodwork while engineer’s square...
TRANSCRIPT
F. 1 Design and Technology
Woodwork
Try Square
• Try square is for woodwork while Engineer’s square is for metalwork.
• They are used for making and testing right angles.
Try Square
• They are also used to test squareness and check the internal and external angles of a workpiece.
Marking Knife
• It is used for making cut lines on wood.
• It is used to cut the fibres of a wood surface before sawing and chiselling.
Marking Knife
• Always keep the flat edge vertically close to the try square or steel rule to ensure that the lines are marked accurately.
Tenon Saw
• It is used for making straight cuts in small pieces of wood such as sawing tenons.
• The steel back is used to stiffen the blade so as to make straight cuts easily.
Tenon Saw
• Always put it back in the tool box after use to prevent unnecessary damages caused by the saw teeth.
Bench Hook
• It is used to support wood for sawing on the bench easily.
• It is also used to protect the bench top during sawing or chiselling.
Sawing on wood
• Choose the suitable saw for cutting. Tenson saws are commonly used.
• Use a marking knife to cut the wood fibre.
• Hold the workpiece by a bench hook.
Sawing on wood
• Pull the saw backward to start the cut.
• Apply force on the forward strokes only.
• Release pressure and slow down the speed when the cut to be finished.
Planes
• It is used for shaping rough wood surfaces to the required size.
Planes
• Do not touch the cutting edge of blade, otherwise it will hurt you.
Planes
• When using the plane, you should follow the correct steps to adjust the plane: (1) Hold the plane for adjust. (2) Adjust the suitable depth of the cut. (3) Make suitable lateral adjustment.
Rasps
• Rasps are used for rough shaping of wood or other soft materials.
• The common shapes of rasps are half-round, flat and round.
Rasps
• The rasp with a narrow head can be used for shaping different works.
• The common lengths of rasps are from 200mm to 300mm.
Test
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MachineVice
• It is used to hold the workpiece for drilling.
• For light drilling, the vice can be held by hand.
• For heavy work, it must be bolted on the table of a drilling machine.
Hand Vice
• It is used to hold workpieces for drilling.
• It is especially useful when you are drilling sheet metal or acrylic sheets.
Drilling Machine
• It is used for drilling holes in wood, metal or plastics.
• The maximum size of the chunk is normally 13mm in diameter.
• Cutting lubricant is essential in drilling holes in most metal.
Drilling Machine
• Safety Notes• Select suitable speeds
for different materials and drill sizes.
• Ensure the drill is securely and properly held in the chuck.
• Remove the chunk key before switching on.
Drilling Machine
• Wear goggles to protect your eyes.
• Clamp the workpiece with a machine vice or hand vice when necessary.
• The chunk must be covered by a chunk guard during drilling.
Cutting inside the wood
• Disconnect the blade from the coping saw, then connect the blade through the hole in the wood.
Finishing
• The abrasive for wood is glasspaper.• The grade from coarse to fine is 2, 1, 0.• It can be used for smoothing plastics.
Joining
• PVA Glue• It is a white glue
widely used for joining paper and light woodpieces. It is water soluble and fairly strong.