Reamer Guide, Meaning , Facts, Information and Description

A reamer 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. For hand tools the drive will usually be a square drive, intended for use with the same type of wrench used to turn a tap for the cutting of threads.

A reamer consists of a set of parallel 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 tool does not fail under the normal forces of use.

Table of contents

1 Straight reamer (precision) 2 Tapered reamer (precision) 3 Tapered reamer (non-precision)

Straight reamer (precision)

A straight reamer is used to make only a minor enlargement in a hole. The entry end of the reamer will be slightly tapered to allow entry into the hole while the larger proportion of the length will be of a constant diameter.

Reamed holes are used to create holes of precise circularity and size. This will allow the force fitting of locating pins, which need not be otherwise retained in the body holding them. Other holes, reamed slightly larger in other parts, will fit these pins accurately, but not so tightly as to make disassembly difficult. This type of alignment is common in the joining of split crankcase halves such as are used in motorcycle motors and boxer type engines. After joining the halves, the assembled case may then be line bored (using what is in effect a large diameter reamer, and then disassembled for placement of bearings and other parts.

Another use of reamed holes is to receive a specialized bolt that has an unthreaded shoulder. This type of bolt is commonly used to replace hot peened rivets during the seismic retrofit of structures.

Tapered reamer (precision)

A precision tapered reamer is used to make a tapered hole to later receive a tapered pin. Such precision joins are used in aircraft assembly and are frequently used to join the two or more wing sections used in a sailplane. These may be be re-reamed one or more times during the aircraft's useful life, with an appropriately oversized pin replacing the previous pin.

Tapered reamer (non-precision)

A tapered reamer may be used cleaning burrs from a drilled hole, or to enlarge a hole. The body of the tool tapers to a point. This type of reamer consists of a body which, typically, is up to 1/2 inch in diameter, with a rod cross piece at the large end acting to form a handle. It is especially useful for working softer metals such as aluminum, copper, and mild steel.

This is an Article on Reamer. Page Contains Information, Facts Details or Explanation Guide About Reamer

	Web www.E-paranoids.com