Q:The idiom of the screw

Lei Feng: I would like to always make a screw, a person's role, for the cause of the revolution, as a machine on a screw machine as a result of the many screws and fixed, only to become a solid whole, can Run freely, play its great ability to work. Although the screw is small, its role is not underestimated. I would like to make a screw hello forever. Screw to regular maintenance and cleaning, it will not rust. People's thinking is the case, to always check will not go wrong

Q:What is the effect of the screw?

The set screw is mainly used to hold the relative position between the two parts. We call the "head screw", the role of the equivalent of the role of positioning pin.

Q:I would like to know the specifications of the two types of screws models, including length, diameter, diameter and pitch, etc.

The specific need to check their own standard parts manual to judge

Q:What is the invention of the screw?

Certainly is the invention of foreigners, specifically who do not know.

Q:Very urgent, please help a lot. I do not have any advanced tools, only the screwdriver or something

Use a 502 glue to stick the screwdriver above it and then twist it down

Q:What is the principle of screw

How it works: Lever principle The screw itself is no theory, the screw thread is a long slope, but the angle is very small. You can assume that when you twist the thread, it is equivalent to pushing a square on the slope. Force analysis: box weight + friction and thrust from now on the use of the principle of leverage.

Q:What is the size of the screw for the wall power switch installation

General use M4 * 25--35 screws, the best installation of the first screw to the oil try to screw about, so easy to install.

Q:Screws, bolts, screws, what is the difference between the three ah?

There are no hexagonal head but the middle of the screw with the middle of the pole known as the double-headed bolts (studs), the whole body is screw called screw, in addition to countersunk head neck bolts, T-slot bolts, anchor bolts, U-shaped bolts. Bolt tightening device for the torque wrench, the opening size of the various shapes of fixed wrench, the opening variable size of the movable wrench, hydraulic tight bolts need hydraulic pumps and other accessories. In short: fasteners with screwdrivers and hexagonal tools are screws, and fasteners with wrenches are bolts. Note: can not be distinguished by the size and length of the nominal diameter. For example, a M48 long 300mm cylindrical head fasteners, GB / 70.1-2008 standard will be defined as hexagonal head screws, not bolts.

Q:What tools are used to remove the screws, the two lines are grooves, the middle of a paragraph is convex

As for the professional name is not clear, probably should be called forked screwdriver it

Q:Screws are not slopes.

Of course, there are slope, as well as self-locking phenomenon, such as self-locking nut