A torque wrench is a very specific tool. On the one hand, this is a well-known ratchet with a ratchet mechanism, a switch of direction of rotation, on the other hand, it is a measuring tool necessary for accurate dosing of the tightening torque of a threaded connection. The second, as is not difficult to assume, will be the main task to be solved with the help of Automobile Remedy to choose good torque wrench.
What are torque wrenches generally used for?
EASY SIMPLICITY
Any threaded connection consists of turns with a certain geometric parameters and a certain accuracy class in the hole (nut, hole in the cylinder block, etc.) and the turns in contact with them on the shaft (bolt, stud, etc.) made with the same geometric parameters. When the internal and external threads contact during the fastening of the fasteners, the rotational movement of the rod relative to the hole is converted into translational.
When reaching the extreme position, for example, the lower surface of the bolt head has reached the surface of the washer, the connection is tightened, namely, in the absence of movement of the rod, its turns with each turn of the key will be pressed more and more against the turns in the hole, while the moment will increase required to rotate the key. Due to the geometric error accumulated from the lower part of the thread, only a few turns closest to the supporting surface will participate in the load perception of the tightening, they will be deformed when the allowable load on the turns acting along the axis of the rod is exceeded. It is this force that determines the greatest tightening torque wrench of the threaded connection.
Some experienced car enthusiasts can “by hand” with a certain degree of accuracy tighten the connection without exceeding the required moment, but are there many such masters among us? Well, we don’t have to talk about the consequences of the fastening of the fasteners, except that not everyone knows that even if you did not break the thread, but the tightening torque was exceeded, then excessive stresses will remain in the connection, which can subsequently lead to deformation or even destruction fasteners or parts. At the same time, one should not underestimate the danger of an unstable connection, because a car is a highly vibration-loaded design, and not locked threaded connections do not like vibration and tend to self-unscrew. Probably a major overhaul of the engine would be caused by the unscrewed bolt securing the head of the block.
Indeed, although the torque wrench is not an essential tool, undertaking more or less complicated repairs, such as engine repairs, is pointless and dangerous without its help.
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