"Electrolytic copper" is the final product of the copper smelting process. It is not in the shape of a spindrel, but rather in sheet form. The edges are not very regular (except when cut out) and the surface is not very smooth.
"Electrolytic copper" can be said to be pure copper, the color is purple, so it is also called "red copper" or "red copper", but in the copper products, add a small amount of other metals (such as zinc, etc.) to improve the pure copper The hardness or other properties, due to the small amount of added, the color did not change, generally still known as "copper" or "red copper."
If more than a certain proportion of zinc is added, the color of copper turns yellow, which is “brassâ€. The hardness of brass is much larger, but the toughness and ductility are worse, and the electrical conductivity is not as good as that of red copper (red copper).
Center Drill Bit is also known as Slocombe Drills, Centre Drills were originally designed to create the countersink required to locate a tailstock centre when turning between centres. They have a point angle of 60° to match the angle of a Tailstock Centre.
A Centre Drill can also be used to provide a start location for a drill when drilling down the centre of a bar held in a Lathe chuck. Centre Drills are short and rigid enough to mark the bar centre without wandering off if they are carefully offered up to a rotating work-piece.
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