Carbide End Mill Sets

Reamers are used to shape or enlarge holes or bores. Reamers are made with both helical flutes as well as straight flutes. The helical flutes offer a shearing cut and are specially useful in reaming holes that have keyways or grooves, due to the fact that helical reamers are bridged, thus preventing binding or chattering.

Hand reamers are made in both solid and expansion forms. The expansion form is very useful when having to repair or when it is necessary to enlarge a reamed hole by a few thousandths of an inch. The expansion reamer is split through the fluted section and is expanded by screwing in a tapering plug.

Reamers are tapered slightly on the end to facilitate starting them properly. The actual diameter of the reamer shanks may vary from 0.002 to 0.005 inch under the reamer size. The part of the shank, which is squared, should be turned smaller in diameter than the shank, so that when applying a wrench, no burr will be raised, which could mar the reamed hole if the reamer is passed through.

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