The surface finishes produced by taper reaming of holes in a composite structure of aluminum alloy and ultra-high strength steel are examined for both dry and lubricated cutting conditions. In dry reaming cutting occurred under built-up-edge (BUE) conditions whereas when a mineral cutting oil was used no significant BUE was formed. Reaming under the latter conditions resulted in a more undulating steel surface finish but a much smoother surface finish for the aluminum alloy.

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