Why is the difference between left and right threads? What's the difference?
There is industrial acetylene gas pressure reducing valve on the thread is also left-handed, in which to play a warning role in order to prompt the attention of the messenger, do not mix with oxygen dangerous.
There are some poles on the diagonal cable, the blue bolt on the left thread is also used more, one is left-handed, one is right-handed rotation, the middle nut can adjust the tension of the cable.
Generally, the right-hand thread is in accordance with people's habits, just as the pointer of a clock is right. Compared with the less threaded but is indispensable, it has certain effect, more commonly used threaded on the rotating shaft with a more general rotation shaft are turning to the right, as some pump, motor, fan in the shaft as a tightening wheel for all kinds of leaves threaded, when the impeller rotation relative to the tightening nut, it has a different rotation inertia force, if it is the right-hand thread words will lead to a tightening mother increasingly loose causing impeller loose damaged equipment. This force in the switch machine or a great change in speed when the performance is particularly prominent, so the choice of left-handed thread more and more tight.
The design direction of rotation screw steel, steel and related crystal. Due to crystal dislocation, under the tensile stresses along a surface slip between the crystal, for single crystal, slip surface and tensile stress direction angle of about 45, at the same time, the crystal will around the stress-induced rotation axis. According to the characteristics of steel, the surface of the reinforcement design into a spiral shape, can effectively improve the strength of steel, save materials, reduce the weight of the building. Of course, there are combined with concrete between considerations.
