There are different types of machinery and methods for measuring the sharpness and the roundness of an object. Often these methodologies are linked to a specific working and to a particular type of object (for example the calibration systems and driving of a lathe or the devices for sharpness electro-optics measuring of shaped objects), however, to result we want to bring some of the main instruments of measurement.
It is also interesting to note the difference with the methodologies of the past and the fundamental role that the characteristics of "Rounded" and "Sharp" now play in the safety and in the furnishings accident prevention measures.
SHARP MEASUREMENT
Today:
Optical sharpness meter
This instrument is used to measure the sharpness of a blade: the machinery shall carry out a test of the blade cutting or measure the peak force required to cut a subject-standard model: lower is the force used, the greater the sharpness of the blade is. A similar version of this device is patented by CATRA (Cutlery Allied Trades Research Association) and it uses a specially calibrated silicon rubber as test media.
In the past:
Sharpness
In the past there wasn’t a particular method of measurement of the sharpness of a blade; the smiths and manufacturers of swords used empirical subjective methods trying the blade against objects of different materials, depending from the Culture (wood, bamboo cane, iron shafts).
Click here to read how were made ancient swords
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