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There are other hardness scales, but the Rockwell scale is especially suited to the rapid inspection of parts.
The Rockwell scale is a hardness scale based on indentation hardness of a material.
The superficial Rockwell scales use lower loads and shallower impressions on brittle and very thin materials.
Pobedit is a specialized alloy that is close in hardness to diamond (85-90 on the Rockwell scale).
The Western style kitchen knives are generally in the range of 52-58 on the Rockwell scale which denotes the relative hardness of a material.
The Vickers hardness test and superficial Rockwell scales (e.g., 45N) can also be used, but tend to cause more surface damage than Knoop.
Each point on the Rockwell scale represents 80-millionths of an inch of depth when the steel is tested with a sharp point and a standardized weight, he explained.
Japanese cutlery is known for sharpness due to its acute blade geometry, and the hardness of the steel used, often exceeding 60 HRC on the Rockwell scale.
LEAD: An answer in the Q&A column of Science Times on Sept. 18 about the Rockwell scale of hardness misstated the system.
The hardness of the materials milled should be no harder than Rockwell C25(Rockwell scale), but workpieces harder than this can be successfully milled.
Dud was the son of Ruth Gowdy Rockwell and Stanley Pickett Rockwell, inventor of the Rockwell scale.
Also because chrome plating is so hard (65 to 69 Rockwell scale), it is subject to damage if the underlying surface deforms during impacts from metal spatulas or pots and pans.
Our machines are designed for Rockwell, Superficial Rockwell and Combined testing to the thirty Rockwell scales with full compliance to the latest National and International standards.
The result is a dimensionless number noted as HRA, HRB, HRC, etc., where the last letter is the respective Rockwell scale (see below).
Hartsfield's blades are Japanese-influenced, each one was hand ground from A2 tool steel, and differentially edge hardened to RC 60-61 on the Rockwell scale with the remainder of the blade hardened to 58-59 on the scale to allow for flex during the cut.
Industry standards crankshaft hardness is 40 on the Rockwell hardness scale.
The Rockwell hardness scale used for the specification depends on the depth of the total case depth, as shown in the table below.
The ideal hardness is usually between HRc58-60 on the Rockwell hardness scale.
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