Mapal's one-shot solution for conrod bores

8th September 2015
Source: MAPAL Ltd
Posted By : Jacqueline Regnier
Mapal's one-shot solution for conrod bores

MAPAL has developed a new solid carbide step drill that is specifically optimised for producing screw and tap bores on connecting rods. By allowing the bores to be produced in a single machining step, rather than the two steps previously needed, the new drill significantly reduces both machining time and costs.

A further benefit is that with the new drill, the threaded through hole and threaded tap hole are produced by the same tool. This means that there is no possibility of misalignment of the two sections, and that the overall bore quality is considerably improved.

 The tool’s special geometry, coating and edge preparation, together with the use of four guide chamfers ensure optimum process reliability with very high performance and tool life. A further innovation is a newly developed chip guiding stage (patent pending), which means that only short spiral chips are produced at the countersink diameter. These chips are easily discharged and cannot wrap around drill or chuck.

 In order to guarantee process reliability and consistently good results in mass production, the drill is manufactured from a special ductile carbide material. In combination with its sturdy geometry, this means it is ideally suited to the production of larger quantities of connecting rods.


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