1, people are left-handed and right-handed, but more than 90% are right-handed. Screws and bolts are tightened clockwise, which conforms to the principle of human engineering mechanics. The speed direction based on the rotating shaft follows the right-hand rule, which is convenient and fast to tighten and suitable for most people.
2. In the production process of screws and bolts, right-handed threads are more convenient than left-handed threads, especially in the turning of large threads, right-handed threads are easier to process.
Tightening screws and bolts clockwise is not a manufacturing requirement.
Extended data:
Threads are right-handed and left-handed, and the tightening and loosening directions are opposite. Tighten the right-hand thread clockwise and loosen it counterclockwise. Loosen the left-hand thread clockwise and tighten it counterclockwise.
Processing method of thread:
1, die: directly use the die to process threads;
2. Rolling: the workpiece is plastically deformed by a forming rolling die to obtain threads;
3. Wire rolling: two thread-toothed wire rolling plates are oppositely arranged at the staggered spacing of12, the static plate is fixed, the moving plate moves in a reciprocating straight line parallel to the static plate, and the moving plate moves forward to frictionally press the workpiece, so that its surface is plastically deformed into threads;
4. Cutting: processing threads on the workpiece with a forming tool or a grinding tool;
5. Thread milling: milling with disc milling cutter or comb milling cutter on the thread milling machine. Disc milling cutter is mainly used for milling trapezoidal external thread of thread milling cutter on screw, worm and other workpieces;
6. Thread grinding: A nut-type or screw-type thread grinding tool is made of soft materials such as cast iron, and the position of the processed thread with pitch error on the workpiece is ground by forward and backward rotation to improve the pitch accuracy.
References:
Baidu encyclopedia-thread