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TYPES OF SCREWS -2 |
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Screws are often used to join materials, such as chipboard, MDF and natural woods. There is a type of screw called a 'self-tapping' screw, that can be used to join metal sheet. Screws are ideal for joining materials either permanently of temporarily. |
RAISED HEAD SCREW:Used to fit door handle plates and decorative features that must look good. |
DOME HEAD SCREW: Can be used for fitting fixtures such as mirrors. The 'cap', which is the dome shape is usually chromed or made from brass and this can be a good feature. It also makes the head of the screw safe as the doom has no sharp edges to catch and cut hands/fingers. |
CHIPBOARD SCREWS: The thread on this type of screw extends all the way along the length. It is best used with chipboard |
SELF-TAPPING SCREWS: these are normally used to cut a thread in metal. A hole is drilled in the metal, a fraction smaller than the width of the screw. The self-tapping screw is then turned into the hole cutting a thread. |
CUP WASHERS |
Used in conjunction with wood screws and self tapping screws. They give a decorative and neat finish. They are often used to assemble Knock Down furniture. |
JOINING MATERIALS USING SCREWS |
1. Mark the position of the screw on the top of the
wood. 2. Drill a clearance hole through the top piece - the same diameter as the shank. 3. countersink the hole if using a countersunk screw. 4. Put the two pieces of material together and drill a smaller diameter hole in the second piece of material 5. Place the screw in the top first hole and tighten carefully with a screwdriver. |
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