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Dabei seit: Apr 26, 2016
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BeitragVerfasst am: Mi Apr 27, 2016 6:24 am    Titel: Kein Icon Tips for Drilling Wood Screws Antworten mit Zitat

Lag Screw that use screws to push against other objects are called presses. A press is used to make cider or wine by squashing fruit to extract the juice from it. Printing presses were also used to make books.

The up and down force generated by a screw can also be used to hold things together. Screws can thread into a metal nut and the up and down force holds the two together. One big advantage of screws used as fasteners is that they can be removed and reinserted many times without loosing their effectiveness. They have greater holding power than nails and can be easily disassembled and reused.

Screws can also be used to lift things. A device called an auger is used for lifting or pumping water or another liquid. As the screw turn in the water, the water is lifted. This is also how a concrete mixer (truck) unloads its load of concrete.

A screw is powered by the movement of the screw driver. It converts this rotational force (called torque) into up and down force. A screw's power depends on how close together the threads are and how far away from the center of the screw force is applied. You can get more power by making the threads closer together. If the threads are close together, then with each turn of the screw it travels a shorter distance but exerts more force. With tighter threads you have to turn the screw more times before it is tight. You can also get more power by using an object that allows you to apply force farther from the center of the screw. This is why it's easier to turn a screw or bolt with a long wrench than a shorter one. But there is a downside to using a longer wrench. With a longer wrench, you have to move the wrench farther in order to turn the screw the same distance.

Throughout the 19th century, the most common types of screw heads were round with simple slots that were turned using screwdrivers and square and hexagonal heads that were turned with wrenches. In the early 1930s, the Phillips-head screw was invented by Henry F. Phillips. This screw has a cross shaped recess in the head for the driver tool.

Screws are not usually dangerous, but some Hex Lag Screw have a point that could scratch or puncture you. They also multiply force, so if you got your hand stuck in a press it could crush your hand.

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