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Ream′ing-bit.

A broach of hardened steel having a taper form and angular cuttingedges. See bit.

Reaming-bit.

Fig. 4195 has a guide at the end of the reamer to fit the hold to be enlarged and maintain the reamer in central position.

It is used for boring out truly or enlarging a hole commenced by a bit of ordinary construction. It has usually a shank about as large as the hole made by its cuttingface, to insure the straightness of the hole. Frequently, it has cutting-edges on its cylindrical portion, and acts to dress off irregularities and make a perfectly cylindrical opening.

Reaming-bits are used in drilling metal; also in dressing to roundness and enlarging the size of holes bored by rock-drills. See reamer.

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