Centre drilling

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Centre drills are usually double sided drills with a 60' stepped point, held in a drill chuck or collet chuck in a lathe or drillingmachine. The purpose of the centre drill is to create an accurate centre hole in the face of a job so as a live centre can be inserted to support the weight and load of the job, whilst turning it. Longer jobs generally require a live centre from the tailstock of the lathe to support the job, which prevents chatter and run out. Centre drills can also be very useful in spotting or starting a precise hole, which will also give a chamfer on the hole. Centre drills come in British Standard Sizing ( No.1 - No.6); eg. No.3 centre drill; are also available in metric sizes.