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Science

What is the Rockwell Scale?

 

A scale which gauges the hardness of a material based on the measure of its indentation. The determination of the Rockwell hardness of a material involves the application of a minor load followed by a major load, and then noting the depth of penetration, in which a harder material gives a higher number.

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Science

What is the Rockwell Scale?
Posted
Monday, 28.11.2011

A scale which gauges the hardness of a material based on the measure of its indentation. The determination of the Rockwell hardness of a material involves the application of a minor load followed by a major load, and then noting the depth of penetration, in which a harder material gives a higher number.

One of the reasons for the lightness and elegance of the Swiss Army Knife is due to the multi-function use of each spring – usually six blades to every two springs. Blades usually have a Rockwell C of 56. Saws, scissors and files have a hardness of RC 53, tin openers and reamers have RC 52 and corkscrews and springs have RC 49.

 

The Tameshigiri procedure

To determine the quality of swords, Japanese blades were tested on the cadavers of criminals in a detailed procedure (tameshigiri) involving sixteen cut variations of alternating difficulty until the examiner was satisfied. One of the most elaborate cuts involved one sweeping cut from the hip to the opposite shoulder.





 
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