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When reaming I am getting either an oversize hole, a taper hold, a bell mouth hole, or a poor finish. What can I do?

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When reaming I am getting either an oversize hole, a taper hold, a bell mouth hole, or a poor finish. What can I do?

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This could be because of misalignment or insufficient cutting action. Several things can be tried to alleviate these problems. Use a bushing – .0002″/.0003″ over reamer diameter. If hole location varies, use floating reamer holder. Increase reamer back taper. Also try a reamer with positive radial rake to reduce cutting pressure. This may produce slightly larger diameter holes.

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