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Daily Archives: November 17, 2014

Vickers Hardness Scale

The Rockwell hardness test measures materials hardness based on the net increase in depth of impression as a load is applied. Hardness numbers have no units, and the higher the number in each of the scales, the harder the material. In the Rockwell method of hardness testing, the depth of penetration of an indenter under certain arbitrary test conditions is determined. Hardness is defined as resistance to local penetration, scratching, machining, wear or abrasion, and yielding. The multiplicity of definitions, and corresponding multiplicity of hardness measuring instruments, together with the lack of a fundamental definition indicate that hardness may not be …

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Rockwell Hardness Scale

Hardness is a materials characteristic and not a fundamental physical property. Knowing the hardness of any metal or alloy is important since hardness value is in correlation to other properties such as materials size and thickness. The Rockwell hardness test is a measurement based on the net increase in depth of impression as a load is applied. Hardness numbers have no units and are commonly given in the R, L, M, E, and K scales. The higher the number in each of the scales means the harder the material. The Rockwell hardness test worldwide adoption likely resulted from the test …

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Sharpening Saw Blades

Sharpening bandsaw blades is a widely known and acceptable practice in both metal and wood cutting industries. It is applied, however, and almost exclusively, to the woodworking set. A primary problem encountered in the woodworking shop is dull saw blades. Objects encountered while cutting wood include nails, bullets, and other similar materials, all of which will help to dull a saw blade. These extractions from green wood cause damage on the edges of sharp teeth. Dull blade teeth aren’t useful and shouldn’t be utilized. Buying a new saw blade is an option, and so is sharpening the dull blade. There are two ways to …

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Kerf and Precise Cut

There are factors to consider when deciding on the right bandsaw blade for the job. Things like the material to be cut, its thickness, bandsaw type, and how it will be used to cut a specific type of material. It is important to consider correct width, pitch, and TPI when purchasing any bandsaw blade. Rake angle, tooth style and set, blade type, and kerf are factors as well. Kerf is the slot made by a cutting tool when parting material — or the amount of material removed by the cut of the blade. The term kerf is mistakenly used to refer to …

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