Machine reamerДЄ machine reamer only has a very slight lead-in. It also allows the reamer to start straight and reduce the risk of breakage. This is to compensate for the difficulty of starting a hole by hand power alone. Hand reamerДЄ hand reamer has a longer taper or lead-in at the front than a machine reamer. The larger proportion of the length will be of a constant diameter. This produces a self-centering action as it enters the raw hole. The entry end of the reamer will have a slight taper, the length of which will depend on its type. Straight reamerДЄ straight reamer is used to make only a minor enlargement to a hole. This also gives rise to chatter marks and defeats the purpose of using the reamer to size a hole. If a hole has an axial split along with it, such as a split bush or a clamping hole, each straight tooth will in turn drop into the gap causing the other teeth to retract from their cutting position. They are also restricted to usage in unbroken holes. The absence of any spiral in the flutes restricts them to light usage (minimal material removal per setting) as they have a tendency to chatter. The act of tightening and loosening the restraining nuts at each end varies the size that may be cut. The disposable blades slide along a tapered groove. They are generally referenced by a letter that equates to a size range. Adjustable hand reamerДЄn adjustable hand reamer can cover a small range of sizes. Chucking reamers can be manufactured with a straight shank or morse taper shank. They come in a variety of flutes and cuts (e.g., right-hand cut, left-hand spiral, straight flute) as well as different shank types. Chucking ReamerД¬hucking reamers, or machine reamers, are the most common type of reamer used in lathes, drill presses, and screw machines that provide a smooth finish to the hole. The following are the main types of reamer tools: For hand tools, the shank end is usually a square drive, intended for use with the same type of wrench used to turn a tap for the cutting of screw threads. A counter-clockwise spiral is therefore preferred even though the reamer is still turned in the clockwise direction.ДЇor production machine tools, the shank type is usually one of the following: a standard taper (such as Morse or Brown & Sharpe), a straight round shank to be held by a collet, or a straight round shank with a flat for a set screw, to be held by a solid tool holder. For example, a tapered hand reamer with a clockwise spiral will tend to self-feed as it is used, possibly leading to a wedging action and consequent breakage. The spiral may be clockwise or counter-clockwise depending on usage. This ensures a long life for the reamer and a superior finish to the hole. They should only be used to remove small amounts of material.

Reamers must combine both hardness in the cutting edges, for long life, and toughness, so that the tool does not fail under the normal forces of use. Each cutting edge is ground at a slight angle and with a slight undercut below the cutting edge.

ConstructionДЄ typical reamer consists of a set of parallel straight or helical cutting edges along the length of a cylindrical body. There are many different types of reamers and they may be designed for use as a hand tool or in a machine tool, such as a milling machine or drill press. The process of enlarging the hole is called reaming. There are also non-precision reamers that are used for more basic enlargement of holes or for removing burrs. Precision reamers are designed to enlarge the size of a previously formed hole by a small amount but with a high degree of accuracy to leave smooth sides. Machine reamers are used on machine tools such as drill presses, lathes, and screw machines. A reamer cannot be used to originate a hole. A reamer is a type of rotary cutting tool of cylindrical or conical shape used for enlarging and finishing to accurate dimensions holes that have been drilled, bored, or cored.

Pipenet reamer