A tool used in drilling to smooth the wall of the borehole, enlarge the hole to the specified size, stabilize the bit, straighten the wellbore if kinks or doglegs are encountered, and drill directionally. See ream.
Used to make a precision size hole. Reamers usually come in three sizes. On size (example: 0.125", 0.250", 0.500", etc), over size: (example: 0.126", 0.251", 0.501", etc), and under size (example: 0.124", 0.249", 0.499", etc). Reamers are used in the drill press on the slowest machine setting and the part is held by hand against the bed of the machine. A precision hole is needed when you press fit two parts together. Reamers do not drill holes. You must frist drill a hole that is 0.010" to 0.020 smaller then the size of the reamer with a drill bit..
(re'mer) (A.S to widen): A reamer is a rotating instrument with spirally turning blades used for enlarging a cavity. It is used for root canal treatment; and a slightly larger version is used for making the bone cavity larger to fit an internal prosthesis in joint replacement surgeries.
A reamer or ream is a tool for enlarging holes and is used in metalworking. It may be used as a hand tool or may have a specialized drive end. For production machine tools the drive will usually be a standard taper.