Screwdriver is generally self-explanatory. It is often used for driving in as well as removing screws. However, a lot of people sometimes apply it in the wrong ways such as punching holes, prying, scraping and chipping.
One of the most common screws and screwdrivers is the Philips head, which is mainly designed to reduce the slippage of blade from the cross-shaped slot with the help of a power bit. In general, a standard screwdriver is used with a screw of matching heads with a single blade.
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Screw head is often round, oval or flat, and each is made with a particular purpose for final appearance as well as seating.
Flat head is always countersunk or rests flush with the surface.
Oval head also permits countersinking, but its head would protrude a little bit.
Screw with a round head rests on top of the surface and is the easiest type to remove.
Screw types consist of the wood screw for when you require a stronger joining rather than a nail, or for when other forms of surface need to be fastened to wood. In general, you would taper this screw to help draw the wood together when you are inserting the screw.
A sheet metal screw could also be applied for fastening metal to wood surface, as well as metal to plastic, metal or other materials. In addition, sheet metal screw is completely threaded from a particular point to its head, and the thread is sharper than that of a wood screw.
Machine screw is often used to join metal components, such as hinge to metal door jamb. Those are inserted in pre-threaded or tapped holes and are usually applied with nuts as well as washers.
Lag screw, also known as square-headed bolt with screw head, is made for heavy holding and is driven in with a wrench instead of a screwdriver.
When you are going for the right length of a screw, bear in your mind that the screw needs to penetrate two third of the total thickness of the material that is being joined. Also remember to take moisture condition into consideration and the make-up of the material that is being fastened to avoid the corrosion. Apply rust-resistant or galvanized screw in which rust would be one of the most common causes.
Useful tips for driving screws:
- Lubricate screw with wax or soap to install it easily.
- Hold work in a clamp or vise when you are inserting a screw whenever possible. If not, keep your body, especially your hands away from the end of the screwdriver.
- If you need to remove a screw that has a broken slot, use a hacksaw blade to cut another one if its head is exposed sufficiently.
- You should always make a pilot hole, which is often two sizes smaller than the screw shank before starting to drive a screw. It is particularly essential in hardwood or when you need to drive a screw at the end of a board. When dealing with a screw with larger diameter, a pilot hole with similar size as the shank of the screw needs be drilled in the wood.
- Always keep the shank of the screwdriver in line with a screw shank, which would avoid pushing out the screw as well as damaging the slot.
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