screw thread by dian

The concept of a screw according to experts in the estimate appears first in the third century BC through the brief note written on a mathematician Archimedes spirals . According to the brief note written by Archimedes , found the design of a simple device that uses the principle of a screw .
In the first century BC , had a screw is of a general nature but still rough cut wood by hand or in a miserly using a metal shaft .
Leonardo Da Vinci have understood the principle of the screw , and she created a sketch that shows how to cut with a machine screw . In 1569 the first lathe was invented by Besson , French citizens . However, the method of making these screws can not survive long , screw manufacture most still use the hand .

Working drawings and pictures so the screw threads on the bolt cropping , the image with the media program in AUTO CAD and Photoshop to add a dividing line

And a threaded fastener assembly equipment for binding components in use in the industry . The shape is called a helical screw thread form . AUTO CAD drawing programs often use software that automatically describe the shape of the screw .

STANDARDIZATION screw thread

At first there is no standardized goods . Myrrh made ​​by a manufacturer in accordance with the bolts will not made ​​by other manufacturers . In 1841 Sir Joseph Withworth start fighting for a standard screw thread , and after it is received by Withworth Threaded throughout the UK .

In 1864 the United States adopted the thread suggested by William Sellers of Philadelphia , but the nut that is made at the Seller can not screw the bolt Withworth

In 1946 the International Commission for Standardizasion Organizasion ( ISO ) was formed to create an international system for metric screw thread . As a result, through the Industrial Fasteners Institute cooperation ( IFI ) , a few commissions the American National Standards Institute , and representatives of preparing ISO standard metric screw threaded fastener .