HOME >> BLOG
What is precision machining tolerance?
1.What is tolerances?
If we have a product in mind, especially a precision machined product, there is one issue we must consider at some point before you commit to the mass production stage and that is – tolerances.
The issue of tolerances involves designers, engineers and manufacturers, and this is a crucial step in the process. As this overlap occurs, it can make it difficult to find a simple answer, so this is the time when tolerances are very important, so what are they?
Many people should have played with Lego blocks, for the degree of fit between the blocks, that subtle sense of assembly, or USB connectors should be aware of, although they all work, but after inserting different devices, sometimes loose sometimes tight, so why is it like this? In fact, this is where the key factor lies, this is the tolerance.
Tolerance of the origin of the general, a product will be assembled through a number of parts, and parts and parts assembled with each other after the degree of tightness, it has another way called fit, and with this matter greatly affects the quality of the product, especially the modern industrial mass production, the standardization of the parts directly affects the later product whether the quality of the same, especially the products will be moving, but also to be able to provide the same Performance, so tolerances are particularly important here.
2.What is the role of tolerances in precision machining?
In fact, we all know that the reality is that there is no perfect product, rapid mass production of mechanical products to do with the design of the exact same size is very difficult. In the CNC machining process, such as machine vibration, parts wear, mold precision, material quality and any other reasons for differences, there will be a variety of defects, perhaps the naked eye looks as if they are the same, but in fact there are small differences in each, but we can define a reasonable tolerance range,so that CNC machining of parts within a certain range of deviation in the dimensions and appearance of the part are assembled with the same quality of the Products,so that the final product to provide consistent performance, of course, the customers also have their own acceptance criteria, this range is called tolerance. Usually, the smaller the tolerance, the stricter the quality requirements of the product, the higher the performance requirements, of course, the higher the cost. This is why the cheap toys sold in the night market sometimes can not even group up, this is because the tolerance is too large.
3.Types of machining tolerances in commonly performed precision machining
Precision tolerances are the main reason why people choose CNC precision machining. Tolerances are also known as dimensional accuracy, and CNC precision machining using specialized processes and cutting tools can reduce tolerances to the smallest possible values, maintaining the closest dimensional accuracy to the original blueprint.
There are four different types of machining tolerances in commonly performed precision machining:
- Unilateral Tolerance: In this type of tolerance, the dimensions are allowed to be changed in a single direction. The tolerance limit can be higher or lower than the desired dimension.
- Bilateral Tolerance: In this type of tolerance, the dimensions are allowed to be changed in both directions. The tolerance limit is allowed to be higher or lower than the desired dimension.
- Composite Tolerance: Composite tolerance is the final tolerance calculated after adding or subtracting the tolerances of the different dimensions that make up the part.
- Limit sizes: Define upper and lower size limits rather than defining the desired size. For example, the preset size can be in the range of 20 mm to 22 mm.
Tight tolerances can be directly inferred from the high degree of accuracy that the final product produced by precision machining will have. Precision machining is often used for parts that need to fit in with other parts. Therefore, high precision is essential for these specific parts to work perfectly at a later stage. If you have a need or a question about precision machined parts, please feel free to contact Allied, and we will give you a satisfactory reply in the shortest possible time.
Contact US
- +86 1996 3099 511
- quote@alliedcn.com
- 8:30a-6:00p Monday to Friday
- No.5608,Xinhua Road,Weifang,Shandong,China
