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 hand wheels.
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.
Sutton Tools Heavy Duty Cobalt jobber drills are industrial quality for drilling materials that have high hardness and tensile strength such as cast iron, bronze, hard steel & stainless steel. These drill bits feature a thick core for increased rigidity in hard materials.
Sutton Tools TiNite® jobber drills are for high performance drilling. Lasts up to 6 times longer than standard HSS drill bits. For drilling metal & tougher alloy steels such as steel, stainless steel, copper, brass, aluminium & cast iron.
Sutton Tools Inox jobber drills are an industrial quality drilling solution specially designed for superior performance in stainless steel. Tailored to overcome the difficult-to-machine material properties of stainless steel, Inox drill bits have a fast spiral, short flute and unique stepped core design providing a smooth and effortless cutting action never before seen. For added wear resistance, these drill bits feature the latest generation Futura Nano PVD coated tip. Inox drill bits have been independently tested to achieve 70% more tool life in stainless steel compared to standard drill bits.