Need help defining technical drawing tolerance

In summary, the conversation discusses a technical drawing for a shaft and bearing bush. The drawing indicates a 85mm diameter H7s6 and the individual is seeking clarification on what this means and how to determine tolerances. They request a mathematical explanation or online resource for finding this information. The term "fit" is mentioned, indicating that this refers to the relationship between the shaft and bearing. The conversation also mentions a website called Google Limits and Fits which has tables for different standards. It is noted that the capital letter represents the hole tolerance and small letters represent the shaft tolerance. The H7s6 fit is described as a medium press fit, meaning that the bearing will have a slightly smaller diameter than the shaft when tolerances are applied.
  • #1
Spheric
1
0
Hi there,

I have a technical drawing considering a shaft and a bearing bush (to slip on). The dawing says 85mm diameter H7s6 and I was wondering what does it mean and how can i figure out the tolerances regarding to H7s6, any mathemtical explanation or a online table to look after?

Thanks in advance.

Spheric.

P.S.> I love this page
 
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  • #2
Google limits and fits. Should come up with loads of tables based on different standards.

Capital letter is a hole tolerance, small letters are the shaft tolerance.

The H7s6 is the fit.

Which looks like a medium press fit iirc, which makes sense for a shaft and bearing.

Ie the nominal diameter is the same, but when tolerances are applied the bearing will have a smaller diameter than the shaft.
 

1. What is the purpose of technical drawing tolerance?

Technical drawing tolerance is used to specify the acceptable variation in dimensions and other characteristics of a part or product. It ensures that the final product meets the desired design and functional requirements.

2. How is technical drawing tolerance determined?

Technical drawing tolerance is determined by considering the functional requirements of the part or product, the manufacturing process, and the materials used. It is usually specified by engineers or designers and must be approved by all parties involved in the production process.

3. What are the different types of technical drawing tolerance?

The main types of technical drawing tolerance are bilateral, unilateral, and limit tolerance. Bilateral tolerance specifies a range of acceptable values on both sides of the nominal dimension. Unilateral tolerance specifies a range of acceptable values on one side of the nominal dimension. Limit tolerance specifies the maximum and minimum acceptable values for a dimension.

4. Why is it important to define technical drawing tolerance?

Defining technical drawing tolerance ensures that all parts or products are consistent and meet the required specifications. It also helps to avoid costly errors and rework during the manufacturing process. Additionally, it helps to communicate the design requirements to all parties involved in the production process.

5. How is technical drawing tolerance communicated?

Technical drawing tolerance is usually communicated through a drawing or specification sheet, which includes the nominal dimensions and the tolerance values for each dimension. Symbols, such as plus and minus signs, are used to indicate the tolerance range. It is important for all parties involved in the production process to have a clear understanding of the tolerance requirements.

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