What Are Cobalt Drill Bits Used For?
Cobalt drill bits are designed and constructed for use in very specific applications. Significantly more expensive than a standard drill bit, the cobalt bits can be a necessity, depending on the material in question. Does this Spark an idea?
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Construction
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Cobalt steel bits are constructed to work at speeds 30 percent higher than other high speed bits; the construction is heat resistant with a thick web design.
Uses
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A cobalt bit is used when drilling into extremely hard surfaces, like cast iron, titanium or treated stainless steel.
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Disadvantages
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Other than the high cost, the primary disadvantage is that the design and construction can leave the bits increasingly fragile after prolonged use. While they are made to drill through the hardest substances, if caught in a bind or twisted, they are very likely to break.
Where To Purchase
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Most hardware stores will carry a selection of cobalt drill bits. You may want to avoid the drill bit assortment, since you may not need all the various sizes included.
Warnings
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Due to the extreme speed of the bits and the real possibility of debris, it is essential you wear personal protective equipment (PPE), especially eye protection; a face shield is preferable.
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