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Diamond Drill Bits

The diamond drill bit is capable of drilling into incredibly hard materials like glass or stone because of the hardness of the diamonds themselves and because it grinds away the material rather than cutting or gouging it. The advantages are as obvious as the disadvantage; diamond drill bits are effective but extremely expensive. There are 2 styles of diamond tipped drill bits: Blunt Nose and Core. Blunt noses have rounded tips with diamonds on the tip and around the sides. They work best for making small holes in glass and can drill on curved surfaces. Diamond core drill bits are hollow and make large round holes. They have diamond on their edges and leave behind a sort of “plug”. Diamond core drill bits are more effective on stone, porcelain, tile etc., and must be used at slow speeds with low pressure.

Diamond drill bits are also made in two ways: Bonded and Sintered. Bonded bits have the diamonds bonded to their surface with an electro plate process. Sintered bits have the diamonds imbedding in the steel itself, so that instead of wearing off the diamonds are replaced as the drill wears down, making sintered bits somewhat longer lasting. Core bits are normally bonded while blunt nosed bits are usually sintered.