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(design engineering)
A tool used to enlarge, shape, smooth, or otherwise finish a hole.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a multiblade metalcutting tool for the precision and fine machining (reaming) of holes after their preliminary machining using a drill, countersink reamer, or boring cutter. Chucking reamers are used on lathes, and hand reamers are used in fitter’s work.

Cylindrical, tapered, and step reamers are distinguished by the shape of the reamed hole; straight-flute and spiral-flute reamers are distinguished by the shape of the cutting edges; and reamers (with a shank) and shell reamers (with a hole) are distinguished by the mounting means used. In addition, solid and compound reamers, reamers with soldered-on cutting edges, reamers with cutting edges that are cemented or mechanically attached, and adjustable and floating reamers are distinguished on the basis of their design.

Figure 1. Diagram of a reamer: (1) cutting section, (2) finishing section, (3) shank, (4) neck, (5) body, (6) cutting edge

The body of a reamer (see Figure 1) consists of cutting and finishing edges. The cutting edges are sharply honed, and a heel 0.1–0.3 mm wide is left on the finishing teeth. The end of the finishing section is made with a reverse taper in the direction of the shank in order to reduce the friction of the reamer against the wall of the hole.


Semenchenko, I. I., V. M. Matiushin, and G. N. Sakharov. Proektirovanie melallorezhushchikh instrumentov. Moscow, 1963.
Kosmachev, I. G. Karmannyi spravochnik tekhnologa-instrumental’shchika, 2nd ed. Leningrad, 1970.
Rezanie konstruktsionnykh materialov, rezhushchie instrumenty i stanki. Moscow, 1974.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A tapered bit having sharp, spiral, fluted cutting edges along the shaft; used to enlarge an opening, to cut the burrs from the inside of pipe, etc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
[6] observed the influence of low speed reaming on vibrations of reamer with modified geometry.
Increasing the reamer size by 1 mm over the isthmus size will double the collected bone debris volume.
Few people will disagree when Reamer says, "Remarkable opportunities are available to enhance the workings of US labor markets through modest investments to improve workforce data resources." As he suggests, building out the national information infrastructure is a high-leverage opportunity with relatively low costs.
Surgeries was performed by 3 surgeons in same hospital and the first surgeon was trained for rigid reamer and the second surgeon for flexible and the third was trained for both techniques.
Before cutting more, I remarked my reamer to indicate another .150" of cutting depth to prevent cutting too deep.
Remove the gauge and install the pull-through headspacing reamer with plenty of cutting oil in the chamber.
Mutual's initial line of bridge reamers debut at, it will later expand to include reamers used in other applications.
The patent pending hydraulic Real Time Activation Drilling Reamer is triggered by standpipe pressure changes, allowing continuous drilling and potentially saving millions of dollars during multiple well operations.
We have already supplied reamers for the company to make -35s in Australia."
What I called the "bullet profile area" is technically called a "leade." We can also call it the barrel "throat." Inside the chamber, the distance between the end of the case neck and the first point cut into the rifled portion of the barrel that coincides with barrel land (rifling) diameter is the preeminent variable determined by the reamer. Land diameter will be the smallest dimension inside a bore.
* Spiral reamers cut more easily, save time and are often used by sheet metal workers to enlarge holes in sheet metal and conduit box outlets, as well as smoothing inside edges of pipe.
MODCO "PI", Padded / Indexable, style series of reamers provide high precision hole sizing with excellent surface finishes and a wide selection of blade types and sizes.