Additionally, the shape of the reamer head varies, including straight shank, polished, T-shaped, long shank, etc. The shape should be chosen based on the shape of the workpiece, the position of the hole, and the difficulty of the processing.

Taper PinReamer Size chart

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Angle: Generally 60 degrees or 90 degrees. 60-degree double-edge reamers are more suitable for soft materials (e.g., aluminum alloys, brass), while 90-degree double-edge reamers are suitable for hard materials (e.g., steel, stainless steel).

This method can provide a reference for designing or grinding reamers based on the size precision of the processed hole. However, factors such as machine spindle radial runout, reamer installation deviation, radial runout of each reamer tooth, coolant, and cutting amount can affect the diameter of the reamed hole, often causing it to expand or shrink. Therefore, to meet process requirements, trial reaming is generally necessary. Based on trial reaming results, correct the calculated tolerance band, then grind the reamer for use.

Metric Taper PinReamer size chart

To help you understand the relationship between reamer sizes, drill bit sizes, and the resulting hole sizes, here’s a simplified version of a reamer size table:

Thus, the reamer size and tolerance band for a Ø10H9 (0+0.036) hole should be Ø10+0.015+0.024. According to reference materials, the tolerance for a Ø10H9 reamer is Ø10+0.013+0.023, which is very close to the calculated tolerance, meeting usage requirements.

Drillreamer chart

Taperreamer size chartin mm

In mechanical manufacturing, determining the reamer diameter tolerance based on the size precision of the hole to be processed is common. The tolerance of the reamer diameter directly affects the size precision of the processed hole, the manufacturing cost of the reamer, and its service life. Dimensional tolerance refers to the maximum allowable deviation from the nominal dimension. In machining, achieving the exact specified dimension is almost impossible, so allowable maximum and minimum dimensions for each part are specified, and the actual dimensions must fall within this range. When selecting a reamer, check the blade diameter tolerance and choose a product suitable for use conditions.

A reamer drill size refers to the specific diameter of the reamer tool used to enlarge or finish a pre-drilled hole to an exact size, also known as the reamer drill bit size. Reamers are precision tools that ensure the hole is smooth and accurate in diameter. The size of a reamer is typically stated in either inches (imperial system) or millimeters (metric system), depending on the specification required.

Reamerdrillsize chartin mm

For example, for a Ø10H9 (0+0.036) hole, the upper deviation of the reamer according to the above formula should be:es= 2 (0.036-0)+0=0.024

Reamer size chartPDF

Depending on the processing requirements and the hole accuracy requirements, it is very important to choose the right accuracy level. Here is a standard reaming tolerance table for different reamer sizes:

Taper pin sizeschart

Selecting the reamer diameter should be based on specific processing needs and application scenarios. Generally, reamer diameters are categorized as follows:

A reamer is a cutting tool used to adjust pre-drilled holes to a specified size or to finish them with high precision. Reamers are widely used in the machining of metals, plastics, and other materials, finding applications in industries such as aerospace, shipbuilding, and mechanical manufacturing. The standard diameter sizes and tolerance specifications of reamers are crucial parameters, affecting both the size of the reamed hole and the workpiece’s precision and surface roughness. When selecting a reamer, it is important to consider processing requirements, hole size, precision requirements, and the type of reamer head to ensure quality and efficiency. Here, we discuss the dimensions and tolerances related to reaming in CNC machining.

ReamerDrillsize chartin mm PDF

Length: Ranges from 55mm to 150mm, similar to single-edge reamers, chosen according to the depth of the hole or the thickness of the workpiece.

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Most mechanical parts use holes and shafts in conjunction. Even if a hole is within the tolerance range, if the hole deviates negatively and the shaft deviates positively, the shaft will not fit into the hole. Therefore, dimensional tolerances are usually determined during the design of the parts, so always check them carefully. Most reamers are made with positive tolerances.

Reamer accuracy grades are typically indicated by letters and numbers, where letters represent tolerance grades, and numbers represent tolerance values. Common tolerance grades include D, H, G, etc., with tolerance values indicated by numbers, such as H7, H8.

Assume the upper and lower deviations of the hole in the processed part are ES and EI, respectively, and the upper and lower deviations of the reamer diameter are es and ei, respectively.

The diameter of the reamer is one of the key factors in selecting a reamer. The choice of reamer size should be based on specific processing needs, the material of the workpiece, and the precision of the machine tool. Improper size selection can affect the quality and efficiency of the reaming process.

When performing reaming, follow the principles of “first rough, then fine; first shallow, then deep; first slow, then fast; first small, then large” to ensure smooth processing and high efficiency.

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Large Diameter Reamers: Diameter between 20mm and 50mm, mainly used for large or special holes, such as those in large machinery parts.