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How to remove the broken screw?
- The other are open to grow a little, grinding flat to seize the rotation, or the middle cut a knife with a zigzag tool to turn, the bigger the better to take the iron put on the surface of the welding, or with a word tool alignment loose Open the direction of the angle to play a few turn a few times, did not save the drill through the hole directly through the big mouth to re-open teeth on the line.s
Who knows who invented the screw?
- The spirits were invented more than 2,000 years ago, but less than 500 years for fixing things. The first person who describes the spiral is the Greek scientist Archimedes (about 287 BC - 212 BC) The Archimedes spiral is a huge spiral in a wooden cylinder used to The water is raised from one level to another, and the fields are irrigated. Its true inventor may not be Archimedes himself. Maybe he just described something that already existed. Perhaps it was the ancient Egyptian craftsmen who had designed it to use the irrigation on both sides of the river. Archimedes spiral in the ancient society are used to raise water, no one considered to change it into a fixed piece. Archimedes spirals are widely used for water lifting. For example, the Romans used it to drain the mine. In the Middle Ages, carpenters used wooden nails or metal nails to connect furniture and wooden structures. In the 16th century, nail workers began to produce spiral nails, these nails can be more firmly connected things. It was a small step from this nail to the screw. At the end of the eighteenth century, screws were quite popular as fixed parts, because at that time a cheap production method had been found. Screwdriver (chisel) appeared in London around 1780 years. The carpenter found that screwing the screw with a screwdriver was better than a hammer and could fix something better, especially when a fine screw was encountered.s
What is the effect of the screw?
- Special purpose screws such as rings are used for lifting parts.s
How to rust the screw
- The easiest way to change the place to hang the original place to hang a murals
Is the tail screw? If it is mainly used in what place? If not what are they different?
- Normally, it should be called drilling screws, screws are the use of the object of the circular circular rotation and friction of the physical and mathematical principles, step by step to tighten the tools of the tools. Drilling screw is the front of the screw with self-tapping the head of the wood screws. Screw is thousands of years of people in the production of common inventions, according to the application field, it is the first major inventions of mankind. Drilling screws are in recent years people's new invention, also known as self-tapping screws. Main steel for connecting between the need for ordinary or high-strength bolts, plates with self-tapping screw connection. It can not be used for metal and metal bonding.s
What is a self-tapping nail? Is it used? What are the characteristics of the shape? What is the difference with ordinary screws?
- Compared with the common screw thread, in the same large diameter, the pitch is small and small diameter is slightly smaller, has been standardized. Self-tapping screw material can be divided into two kinds of carbon steel and stainless steel, carbon steel materials which are usually used in 1022 medium carbon steel. Usually used in doors and windows, metal. The head is the end of the end of the shape of the part of the formation of the formation of the surface.For thread forming and thread cutting self-tapping screws (self-tapping screws), the flat top buried, flat round countersunk, pan head, hexagonal and hexagonal wire Head of the most important, these five head type accounted for almost all 90% of self-tapping screws, the use of self-tapping screws (self-tapping screws) should first consider this.s
What is the size of the screw for the wall power switch installation
- Concealed switch generally M5 × 30 semi-round head screws, you can also use M4 × 30 tapping screws. Ming installed switch is used M5 expansion with M5's self-tapping screws.s
What screw can get into the iron?
- This screw we usually call the tail wire it has a drilling tapping and fastening parts to complete the function of a one-time convenient; drill recommended with the speed of hand drill! Because the speed of this hand drill can be slow down the general hand drill speed is too high in a short period of time to burn the drill wire drill hole in the face of the drill wire can not enter; even into the sometimes because the speed is too high and twist Broken footers in vain! OK!s
what does pcb mean
- A lot of people have heard of "PCB". But what does pcb mean？In fact, it is very simple, that is, the printed circuit board.It will appear almost in every kind of electr...
What is printed circuit board
- What is printed circuit board, a lot of people have heard of the "PCB" the English abbreviation name. But what does it mean? In fact, very simple, that is, the printed ci...
How much are chains for tires
- Tyre protection chain, is a link and connection between the link on both sides of the body of the chain components, connecting link in the side chain and the connection on both end...
Hook and loop sandpaper
- Hook and loop sandpaper is specially used for polishing hook and loop analysis for sample blocks with sandpaper, similar to the hook and loop sandpaper their appearance and ordinar...
Do you know how do screws work
- Do you know how do screws work? If you want to low how do screws work, you have to learn something new.How do screws work? To answer this question, we had better to know what is sc...