91ÊÓƵ¹ÙÍø

What are a Reamer and its Function?
Knowledge

What are a Reamer and its Function?

Reamers are rotary tools with one or more teeth, used to remove a thin layer of metal from the surface of a machined hole. These rotary finishing tools are used for adding a desired finish to the inside of predrilled holes.
Published: Apr 19, 2022
What are a Reamer and its Function?

What is a Reamer?

A reamer is a cutting tool used for machining, designed to slightly enlarge the size of a drilled hole, but with high precision, ensuring a smooth surface finish on the inside of the hole. Reamers are the most accurate hole-making tools currently available, and are usually used to meet the high H6/H7 tolerances required by ISO standards. Both ISO and ANSI metric standards refer to standards that apply to fasteners that can be freely assembled and disassembled. When properly used, a reaming tool can ream thousands of holes to high-precision without compromising performance.

There are many types of reamers, including machining tool reamers and hand reamers. High-precision mechanical reamers are often used in lathes or machining centers. A reamer is a precision tool, and its precision depends on the machine, the operator's ability to operate the machine, and the functional characteristics of the tool itself. Reamers can be produced from carbide, high-speed steel, or metal-ceramic composites.

The Purpose of the Reamer:

A reamer has one or more teeth which remove a thin layer of metal from the machined surface of a hole. The reamer is used, mainly to improve the machining accuracy of the hole and reduce the roughness of its surface. Hand reaming is often used to finish dowel holes or pinholes to allow an interference fit between the hole and the dowel. Reamers can only remove a very small amount of material, usually only about .005 to 0.008 inches, so are ideal for producing a high-quality finishes on hole surfaces.

Although reamers are more commonly used for machining cylindrical holes, a tapered reamer can be used to machine a tapered hole; but this is quite rare. Hand reamers and machine reamers are both common and can both be used for straight shank reaming and taper shank reaming.

Operation of the Reamer:

As a reamer only removes a thin layer of material from the surface of a machined hole, it cannot be used to remove large amounts of material. The amount of material removed depends on several factors, including the material to be machined and the size and quality of the pre-drilled holes. For mechanics, this is a process that requires careful balancing. For the reamer to work efficiently, it is critical to have the correct allowance in the hole. Too much allowance and the reamer may struggle to run and the hole may be deformed. Too little allowance and the reamer will rub and wear, resulting in poor hole quality. The cutting edge of the reamer needs to have a certain hardness to prolong the service life; it also needs to have good toughness so that the tool will not fail during normal use. Proper use requires the careful selection of the proper tool for the material being machined, and close control of the allowance to ensure long reamer life and a high-quality hole finish.

Also, if the workpiece is not held securely when reaming, chattering can result, the finish of the part will be poor and the cutting edge will become dull. Friction and extreme heat can also cause problems during reaming, which means that effective lubrication is essential not only to cool the tool but also to extend the life of the reamer. Lubrication also increases cutting speeds, reduces cycle times, and removes chips, helping to improve the finish of the workpiece.

Types of Reamers:

  • Reamers are divided into hand reamers and machine reamers according to the way they are used.
  • Reamers can be either cylindrical reamers or conical reamers, depending on the shape of the hole being reamed.
  • According to the direction of the chip groove, reamers can be either straight groove and spiral groove.
  • Reamers can have either straight shanks or tapered shanks.
  • Reamers can be made of high-speed steel or have cemented carbide inserts.
Reamers can have various numbers of teeth and tooth slots:

The number of teeth of the reamer affects the reaming accuracy, surface roughness, chip space, and tooth strength. Its value is generally determined according to the diameter of the reamer and the material of the workpiece. When the diameter of the reamer is larger, a larger number of teeth can be selected. When machining ductile materials, the number of teeth should be smaller. When processing brittle materials, a larger number of teeth is preferable. To facilitate the measurement of the diameter of the reamer, the number of teeth should be an even number. For holes ranging in diameter from 8~40mm, the number of teeth is generally 4~8.

Design Points - Reamer Diameters and Tolerances

The diameter tolerance of the reamer directly affects the dimensional accuracy of the machined hole, the manufacturing cost, and the service life of the reamer. When reaming, due to the radial runout of the cutter teeth, the amount of reaming, and the cutting fluid, the aperture will be larger than the diameter of the reamer. This phenomenon is called reaming expansion. At the same time, because the blunt radius of the blade squeezes the hole wall, the hole will recover and shrink. This effect is called reaming shrinkage. Reaming with a high-speed steel reamer generally results in explanation, while reaming with a carbide reamer generally results in shrinkage. This shrinkage that results is usually is greater when reaming thin-walled holes. The nominal diameter of the reamer is equal to the nominal diameter of the hole. By understanding the effects of expansion and contraction, and allowing for the necessary wear tolerance, the upper and lower deviation of the reamer can be determined.

Published by Apr 19, 2022 Source :, Source :

Further reading

You might also be interested in ...

Headline
Knowledge
Pneumatic Power Tools: Reliable, High-Performance Solutions for Industrial Applications
Pneumatic power tools, commonly known as air tools, are widely used in industrial, automotive, and construction settings due to their efficiency, durability, and power. These tools operate using compressed air, making them a lightweight and high-powered alternative to electric or battery-operated tools. Pneumatic power tools consistently perform well, even under the most demanding conditions. They come in various forms, including impact wrenches, pneumatic drills, sanders, grinders, ratchets, air hammers, chisels, paint sprayers, nail guns, and staplers.
Headline
Knowledge
Introducing the Vise Grip: A Tool of Precision and Power
In 1921, in the quiet workshop of a small-town Nebraska blacksmith, William S. Petersen, a Danish immigrant, invented an ingenious tool that forever changed the landscape of hand tools. He created a new type of pliers with a vise-like grip that could lock onto his work. The Vise-Grip's unique ability to securely latch onto any object with unparalleled precision and strength not only made it a tool but a true extension of the craftsman's hand. This provided an adjustable, locking grip for a wide range of applications.
Headline
Knowledge
Adjustable Wrenches and Pipe Wrenches: Essential Tools for Plumbing and Maintenance
Adjustable wrenches and pipe wrenches have long been recognized as effective solutions for mechanical repairs, plumbing, and construction. Due to their ability to adjust jaw width, they are extremely versatile, allowing a single wrench to fit various sizes of nuts, bolts, and pipes. Their practicality and durability have made them indispensable tools for both professionals and DIY enthusiasts. Each type of wrench serves a unique function and offers distinct benefits.
Headline
Knowledge
RO Filter System Quick Fit Connectors: A Reliable and Efficient Solution
Quick fit connectors have become a preferred solution for connecting tubing in reverse osmosis (RO) filter systems due to their ease of use, reliability, and efficiency. Traditional threaded and compression fittings often require tools and careful handling to ensure a secure and leak-free connection. Quick fit connectors, however, offer a tool-free, push-to-connect mechanism that ensures a tight seal in seconds. Their widespread adoption in RO filtration and other water treatment applications highlights their effectiveness in enhancing system performance and installation convenience.
Headline
Knowledge
RO Membranes: A Key to Effective Water Filtration
Reverse Osmosis (RO) membranes have long been recognized as one of the most effective solutions for filtering water, providing clean and purified water for both residential and industrial applications. Originally developed in the 1950s for desalination, RO technology gained widespread acceptance due to its ability to remove contaminants at the molecular level. As concerns over water quality continue to rise, RO filter systems have become a fundamental component in providing safe drinking water, desalinating seawater, and supporting various industrial processes.
Headline
Knowledge
RO Filter System Pressure Valves and Flow Restrictors: Enhancing Efficiency and Performance
Reverse osmosis (RO) filtration systems have become a staple in water purification due to their ability to remove contaminants effectively. 91ÊÓƵ¹ÙÍøever, the efficiency and longevity of an RO system depend heavily on precise water flow control. Pressure valves and flow restrictors play a crucial role in optimizing the system's operation by regulating pressure and ensuring optimal flow rates. These components improve RO system efficiency, reducing wastewater, and maintaining membrane performance.
Headline
Knowledge
PP Pre-Filters: Essential Protection for RO Filter Systems
Reverse Osmosis (RO) filtration systems rely on high-performance membranes to remove contaminants from water. 91ÊÓƵ¹ÙÍøever, these membranes are highly sensitive to particulates, sediments, and other impurities that can reduce their lifespan and efficiency. Polypropylene (PP) pre-filters are used as a reliable and cost-effective solution to protect RO membranes by trapping large particles before they reach the membrane. PP pre-filters significantly enhance the overall effectiveness and longevity of an RO filtration system. Regular replacement of PP pre-filters is much more economical than frequent replacement of expensive RO membranes. Beyond RO systems, PP pre-filters are widely used in industrial applications, municipal water treatment, food and beverage processing, pharmaceuticals, and electronics manufacturing, where water purity is a critical requirement.
Headline
Knowledge
The Essential Role of Carbon Pre-Filters in RO Filtration Systems
Reverse osmosis (RO) filtration systems have long been regarded as one of the most effective methods for purifying water, removing contaminants, and improving water quality. 91ÊÓƵ¹ÙÍøever, thin-film composite (TFC) membranes are highly sensitive to chlorine, making carbon pre-filters essential for preventing membrane damage and ensuring long-term system efficiency. Carbon pre-filters protect the delicate membrane by reducing chlorine, sediment, volatile organic compounds (VOCs), and other impurities that could deteriorate the membrane and compromise performance. Over the years, advancements in carbon filtration technology have enhanced the effectiveness of RO systems, ensuring cleaner and safer water for residential, commercial, and industrial use.
Headline
Knowledge
PE Tubing for RO Filter Systems
Polyethylene (PE) tubing plays a crucial role in ensuring the safe and efficient transfer of water within RO filtration systems. Recognized for its durability, flexibility, and resistance to contaminants, PE tubing has become a preferred choice for both residential and commercial water purification applications. PE Tubing is used in RO Systems for nearly all water connections including inlet, membrane, storage tank, faucet, and drain line tubing. The benefits, types, materials, manufacturing process, and best practices for using RO filter system PE tubing are extensive.
Headline
Knowledge
Faucets in RO Filter Systems: Enhancing Performance and Aesthetics
One often overlooked component of drinking water filtration systems that significantly impacts both functionality and aesthetics is the filter system's faucet. A high-quality faucet not only ensures smooth operation but also enhances the user experience and complements the kitchen design. The right faucet for an RO system combines durability, safety, and convenience with a stylish appearance that blends seamlessly with both modern and traditional kitchen designs.
Headline
Knowledge
Pressure Gauges for RO Water Filter Systems
With any water filtration system, ensuring optimal system performance is critical for maintaining water quality and extending the lifespan of filtration components. Reverse osmosis (RO) water filter system pressure gauges are an effective solution for monitoring pressure fluctuations within filtration systems, helping users detect potential issues before they compromise water quality. By providing real-time pressure readings, these gauges enable users to assess the condition of their filters, diagnose clogs, and ensure proper system operation.
Headline
Knowledge
Garden Hose Spray Nozzles
Garden Hose Spray Nozzles attach to the end of a garden hose and provide a versatile solution to water distribution, allowing for everything from a fine mist for delicate flowers to a strong jet for cleaning garden paths. They not only help in efficient water management but also make gardening tasks more convenient and effective. Beyond garden care, these nozzles are incredibly versatile in their applications. They can be used for washing cars, cleaning outdoor furniture, and even bathing pets. This adaptability makes them an indispensable tool in any household. By controlling the spray pattern and intensity, water is utilized more efficiently, reducing waste and saving on water bills, which is particularly beneficial in regions with water usage restrictions.
Agree