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The manufacture of a steel bur necessitates more than twelve successive operations and involves a very extensive production plant. A battery of automatic precision lathes machines the bars of a special steel to rough out the burs. The heads of these roughed-out burs are then cut by techniques which differ according to the different types. This precision work is carried out by a small hob of a few millimeters in diameter which, for example, cuts six precise and different teeth on a head of 8/10ths of a millimetre.The heat treatments have also a very great importance in the manufacturing process.

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Twist drills

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