What Is Reaming?

Are you curious to know what is reaming? You have come to the right place as I am going to tell you everything about reaming in a very simple explanation. Without further discussion let’s begin to know what is reaming?

In the world of machining and metalworking, achieving precise dimensions and smooth surfaces is a top priority. Among the many techniques employed to attain this level of precision, reaming stands out as a fundamental process. Reaming plays a crucial role in refining drilled holes, enhancing their accuracy, and ensuring optimal performance of mechanical components. In this article, we’ll delve into the art of reaming, its significance, and how it contributes to the world of manufacturing.

What Is Reaming?

Reaming is a machining process used to improve the accuracy, surface finish, and size of a drilled hole. It involves using a cutting tool called a reamer to remove a small amount of material from the inner surface of the hole. The result is a hole with precise dimensions, better roundness, and a smoother finish.

The Reaming Process:

The reaming process involves the following steps:

  1. Preparation: Begin by drilling a hole slightly undersized compared to the desired final dimension. This initial hole serves as a guide for the reamer.
  2. Selection of Reamer: Choose a reamer that matches the desired final hole size. Reamers come in various designs, including hand reamers and machine reamers.
  3. Inserting the Reamer: Insert the reamer into the undersized hole. The reamer typically has multiple cutting edges that gradually remove material as it’s rotated.
  4. Rotation and Feed: The reamer is rotated while being fed into the hole. The cutting edges remove material from the hole’s inner surface, refining its dimensions and surface finish.
  5. Coolant and Lubrication: In some cases, coolant or lubrication may be used to reduce friction and heat generated during the reaming process.
  6. Measuring and Inspection: After reaming, the hole’s dimensions are measured using precision instruments to ensure that it meets the required specifications.

Significance Of Reaming:

  1. Precision: Reaming helps achieve highly accurate hole dimensions, essential for components that require precise fits, such as bearings or bushings.
  2. Surface Finish: The reaming process improves the surface finish of the hole, reducing roughness and promoting better contact between mating parts.
  3. Roundness: Reaming contributes to maintaining roundness in the hole, which is critical for components that need to rotate smoothly.
  4. Tolerance Control: Reaming allows manufacturers to control tolerances more effectively, ensuring that components fit together as intended.
  5. Cost Efficiency: Instead of creating holes to the final size through drilling, reaming is often more efficient, as it requires less material removal and results in less tool wear.

Challenges And Considerations:

  1. Tool Wear: Reamers are subjected to wear over time due to the cutting process. Proper tool maintenance and selection are essential.
  2. Material Selection: Different materials may require specific reaming speeds, feeds, and lubrication techniques to achieve optimal results.
  3. Surface Integrity: Care must be taken to avoid burrs or surface defects during the reaming process, as these can affect the functionality of components.
  4. Dimensional Accuracy: While reaming improves accuracy, it’s crucial to carefully monitor the process to avoid over-reaming and exceeding desired tolerances.


In the intricate world of precision machining, reaming stands as a testament to the art of material removal with finesse. By enhancing drilled holes with exact dimensions, smoother surfaces, and improved roundness, reaming ensures that mechanical components function optimally and fit seamlessly. This process exemplifies the dedication to detail and meticulous craftsmanship that underpins modern manufacturing, contributing to the creation of products that meet the highest standards of quality and performance.


What Do You Mean By Reaming?

(rimɪŋ) noun. (Mechanical engineering: Manufacturing and assembly) Reaming is a cutting process in which a cutting tool produces a hole of a very accurate size. Reaming is done to a hole which has been already drilled, to produce a truly circular hole of exactly the right diameter.

What Is The Purpose Of Reaming?

Reaming: Reaming is a sizing operation that removes a small amount of metal from a hole already drilled. It is done for two purposes: to bring holes to a more exact size and to improve the finish of an existing hole.

What Is Drilling And Reaming?

In hole-making, it is important to know the difference between Drilling, Boring, and Reaming because they all have a specific job. Drilling is usually the first step in creating the hole, followed by boring which sizes the hole, then reaming which finishes the hole.

What Is Reaming Machining?

Reaming is a finishing operation of high-precision holes performed with a multi-edge tool. High surface finish, superb hole quality, and close dimensional tolerance are achieved at high penetration rates and small depths of cut.

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