Single pass bore finishing

In one particular application, up to 0.038mm of ductile iron needed to be removed and, as the bore had limited clearance at the bottom, a semi-blind bore finishing tool design was needed. It was decided to hold the part rigid and float the tooling, so spring-loaded holders provided the radial float for the tool assemblies, together with a special, free-pivoting union which was incorporated inside the mandrel of the tool.

The tooling progression consisted of a series of six tools ranging from 40/50 down to 200/230 mesh diamond. The process tolerance needed to be held within a total range of 0.7um, including variation in bore shape and overall gauge accuracy and repeatability.

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