Self Tapping Screws And Other Linear Actuators -


Self Tapping Screws And Other Linear Actuators

By Bonnie Contreras

Another name for self tapping screws is self drilling screws. The clue is in the name. They drill the hole in the metal for you so you do not have to drill what is called a pilot hole first. This is useful when you want to mount things like computer monitors onto metal shelving because you do not have to fiddle around matching up holes, you just drill the screw through everything and you only have to do it once.

These gadgets are really clever. You get the job done without needing extra pairs of hands or starting any arguments. They are also used to mount security cameras and in dental and other types of surgery. Dental implants are a type of linear actuator.

Like other screws, the heads of the self tapping kind are either plain or cross-headed. The cross-headed, or Phillips, variety give a little extra stability when juggling two or more layers of material. It is amazing how a trivial difference in structure can make a huge difference in function. It really is a matter of having the correct tool for the task at hand.

Most screws have a right-handed, or clockwise, thread. To tighten, turn clockwise; to loosen, turn counter-clockwise. The easy way to remember this is righty-tighty, lefty-loosey. The same mnemonic works for opening and closing jars as well as adjusting the radiator.

There are like a gazillion different types of screw. They differ in the space, or pitch, between threads. They differ in what they are made of, usually steel, brass, copper, nickel or zinc. Their heads may be flat, round and have one or two grooves in the top of the head. The two-grooved heads are known as cross-head or Phillips head.

Henry F. Phillips bought the design from a guy named John P. Thompson, tinkered with it then patented it. One of his early customers for the new technology were the makers of the Cadillac, General Motors. Phillips, in ailing health, sold the patent to Ford Motor Company in 1945 for a whopping $5 million, a lot of money now and a whole lotta money then.

When a screw is likely to face strong counterclockwise torque, which would loosen a right-handed screw, a left-handed screw is the correct choice. For instance, the left side of a bicycle has a left-handed thread. Anything with helical threads can legitimately be called a screw. The propeller of a ship is an example, as is an Archimedes' screw water pump.

It is really fun to watch self tapping screws in action. You can get quite a lot of work done in very little time, a satisfying prospect. Juggling two or more pieces of material together and trying to get the screw to hold can be tricky and exasperating. In many ways, simple devices are better than more complicated ones. There are a number of varieties of screw. They have different diameters and different distances between individual threads. They are manufactured from several different types of metal, including copper, nickel, chromium, brass, zinc and steel. Another important difference is in the construction of the screw's head, whether it is flat, round, plain or Phillips headed.

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