How does reaming improve a drilled hole?

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Reaming improves a drilled hole by enlarging it and finishing it to accurate dimensions. While a drill is used to originate a hole, it often lacks the precision required for specific engineering tolerances. A reamer acts as a rotary cutting tool that refines the hole's size and surface quality through its sharpened flutes or chamfered edges.1

Because reamers are designed for finishing rather than hole creation, they ensure that the final diameter meets exact specifications, which is essential in machine tool operations such as those performed on lathes or drill presses.1