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What is a mechanical dynamometer made of ?
Today, a mechanical dynamometer consists of a spring, of a measurement cursor, of the graduations with a maximum weight but also a hook to attach the object in question.
What is the difference between a mechanical dynamometer and an electronic dynamometer ?
Mechanical and electronic force gauges work in the same way, except for a few details.
The operating principle of the needle dynamometer is quite simple. It relies mainly on the spring that equips it, although the other components also have their role. Indeed, when the dynamometer is subjected to a tensile force (an element of a certain strength is hooked to the measuring hook), the spring undergoes a calibrated deformation.
Depending on the force attached to the hook, the spring will extend a certain number of centimeters. The graduation is then indicated in Newton. Whether it is a circular mechanical dynamometer or a mechanical spring force gauge, the principle is the same. Both versions of the mechanical force gauge are sufficiently well calibrated to provide accurate measurements.
Mechanical dynamometers directly use the principle of Hooke’s law. Indeed, since an ideal spring follows a relation of type force = stiffness × elongation, we can determine the value of a force by measuring the elongation of a calibrated spring (i.e. whose stiffness is known). Among the best known mechanical dynamometers are the pesons, and the Poncelet dynamometer.
What is the advantage of a mechanical dynamometer ?
The advantage of a mechanical dynamometer is that it is unwearable i.e. it has a long service life.
The dynamometer is a rather simple to use object that, over time, has become more and more democratic and practical.