A reamer is a tool used to expand a pre-existing hole in metal by a tiny amount in order to leave smooth sides and edges while eliminating any burrs or rough edges. It's a pointed circular file with a diamond dust tip that creates a firm, durable surface that's ideal for filing. Reamers are useful for smoothing out holes of various sizes.
Reaming can be a difficult task with just your hands, so many people choose to have their holes reamed using a power drill and special bit called a reamer. The reamer gradually reduces the diameter of the hole until it reaches the desired size. After reaming, the hole must be thoroughly cleaned of debris and smoothed off any sharp corners with a file. If necessary, repeat the reaming process once more until you're satisfied with the result.
People use reams for a variety of purposes including but not limited to: mounting lights for photography, plumbing, wiring, etc. into walls or ceilings without having to first remove the wall or ceiling material; creating a channel in wood to hold a pipe or cable; adding more space between floor joists (in a house frame) for better room-to-room ventilation or storage; and lastly, but most commonly, reducing the diameter of a hole drilled in metal work such as piping, heating and cooling systems, and electrical wiring.
There are several types of reamers on the market today.
A reamer is a sort of rotary cutting tool that is commonly used in metalworking. Precision reamers are intended to increase the size of a previously produced hole by a minimal amount while maintaining a high degree of precision and leaving clean sides. Reaming is the process of widening the hole. A rough-hole can be widened using a reamer or drill. The term "reamer" comes from the fact that they remove material from the inside of the hole.
There are two types of reamers: fixed-head and sliding-head. Fixed-head reamers have a single, fixed-angle blade which cannot be changed. This makes them ideal for finishing holes that have already been drilled. Sliding-head reamers consist of a head with several parallel blades that can be shifted into different positions to cut different diameter holes. This allows a single reamer to fill a wide range of drilling requirements.
The most common use for reamers is to increase the size of holes that have been drilled with a drill bit too small to finish the job. If you need to make a larger hole but don't want to use a drill then this would be done with a reamer instead. Reaming will not create any more surface area than what was present before starting. So if you need a hole that takes a 5/8" bolt then it must be at least 3/4" deep.
A reamer is a cylindrical or conical-shaped rotary cutting tool used for expanding and completing holes that have been precisely drilled, bored, or cored. A reamer can't be used to make a hole. It enlarges an existing one.
Reamers are used in drilling, boring, and threading applications where it is necessary to enlarge an existing hole, cavity, or space. They are also used to prepare the end of a pipe for a weld by removing some of the material away from the edge.
There are two types of reamers: fixed-cutter reamers and adjustable-cutter reamers. Fixed-cutter reamers hold their cutters rigidly so they produce a constant diameter hole size. This is useful for maintaining tight tolerances or when making multiple parts with the same overall diameter but varying inside diameters. Adjustable-cutter reamers allow the user to change how much cutter cuts into the material being reamed. So they can reduce the risk of breaking off too much metal if you're trying to make a shallow hole or accept a less than perfect surface on what was once a round stock part. Also, because they can cut deeper into the material, adjustable-cutter reamers are useful for removing more material from within the hole or cavity being reamed.