Reamers

A typical reamer consists of a set of parallel straight or helical cutting edges along the length of a cylindrical body. Each cutting edge is ground at a slight angle and with a slight undercut below the cutting edge. 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. They should only be used to remove small amounts of material. This ensures a long life for the reamer and a superior finish to the hole.

The spiral may be clockwise or counter-clockwise depending on usage. 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. A counter-clockwise spiral is therefore preferred even though the reamer is still turned in the clockwise direction.

For 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 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.

Jig Bore Reamers Right Hand Spiral Flute, Right Hand Cut, HSS Select Individual sizes from 1/8 to 1 Inch Diameter ID 1711-

$154.99USD

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Jobber Reamers High Speed Steel Taper Shank 1/4 to 1-1/2" Diameter ID 1712-

$71.78USD

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Shell Reamers High Speed Steel Straight Flute .6256 TO 4.0 Inch Diameter Sizes ID 526-

$94.99USD

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Taper Pin Reamers, Sraight, Spiral, Helical, Flute HSS Sizes 7/0 to 14

$37.88USD

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Taper Pipe Reamer HSS 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1-1/4, 1-1/2, 2, 2-1/2 Diameter

$44.28USD

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Reaming versus drilling to size

The geometry of a hole drilled in metal by a twist drill may not be accurate enough (close enough to a true cylinder of a certain precise diameter) and may not have the required smooth surface finish for certain engineering applications. Although modern twist drills can perform excellently in many cases—usually producing sufficiently accurate holes for most applications—sometimes the stringency of the requirements for the hole's geometry and finish necessitate two operations: a drilling to slightly undersize, followed by reaming with a reamer. The planned difference between the drill diameter and the reamer diameter is called an allowance. (It allows for the removal of a certain small amount of material.) The allowance should be < 0.2 mm (.008 in) for soft materials and < 0.13 mm (.005 in) for hard materials. Larger allowances can damage the reamer. The drilled hole should not be enlarged by more than 5% of the drilled diameter. Drilling followed by reaming generally produces hole geometry and finish that is as close to theoretical perfection as possible. (The other methods of hole creation that approach nearest to perfection under certain conditions are boring [especially single-point boring] and internal cylindrical grinding.)

High-speed steels     Most commonly used. Inexpensive.
    Hardness up to Rc 67. Sharp cutting edges, meaning less cutting force.
    The high cobalt versions are very resistant to heat and thus excellent for reaming abrasive
and/or work hardening materials such as titanium and stainless steel.

CDTooling.com

Reamers

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