Mapal’s solid carbide step-drill suits conrod applications

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

A further benefit is that 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.

The tool features special geometry, coating and edge preparation, together with the use of four guide chamfers to boost process reliability.

A further innovation is a newly developed chip guiding stage (patent pending) that means that only short spiral chips are produced at the countersink diameter. These chips are discharged easily and cannot wrap around the drill or chuck.