Bordo HSS Centre Drill Set - 2560-S1

• Centre drills are used with a lathe to centre drill stock for mounting in the lathe.
• They are designed to drill a small diameter pilot hole followed by a 60° countersink which provides a bearing surface for the 60° point of the lathe centre.
• Centre drills are also used extensively with milling machines to accurately start holes.
• The hole locations can be dialled in using the milling machine’s calibrated handwheels.
• The hole is then started using the centre drill.
• The large diameter shank on the centre drill holds the drill point right on centre.
• Once the hole is started, the centre drill is replaced with a drill of the desired diameter and the finished hole is then drilled.

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