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Stable despite oversize - 10xD

Successful use of our vibration-damped boring bar.

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EWS boring bar with 10xD cantilever length in use at PROMILL SPA, Chile

At PROMILL SPA, a company based in La Pintana, in the metropolitan region of Santiago de Chile, which develops integrated manufacturing and implementation solutions for mining and other industries, a vibration-damped EWS boring bar - with a length of 1900 mm and a diameter of 120 mm - is successfully used for internal machining.

In close cooperation with our partner and representative J&A International S.A., Santiago de Chile - a long-standing EWS partner and provider of state-of-the-art solutions in the areas of surface restoration, industrial wear protection and high-precision metal processing - the standard solution from the EWS boring bar catalog was seamlessly integrated into the existing production process - and ensures maximum process reliability despite the extreme overhang length.

The challenge

PROMILL carries out deep machining steps in the manufacturing process - with a tool whose projection length corresponds to 10 times the diameter (10xD). A vibration-damped boring bar from EWS was used for this purpose. A square turning steel holder is mounted on the head of the boring bar. This is not a classic boring head (such as an indexable insert drill), but an interface for holding an ISO turning steel for internal machining. Alternatively, the boring bar can be fitted with an interchangeable cutting head. Both variants work with indexable inserts and are suitable for roughing and finishing in demanding internal machining operations.

The result

The integrated damping technology of the boring bar minimizes vibrations and enables stable, precise machining even with large overhang lengths. PROMILL benefits from several improvements in the machining process: