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TYPES OF SCREWS -2
V. Ryan © 2002 - 2022
 
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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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