Each drawing has dimensional tolerances. After all, it is impossible to make a part without size tolerances. There is no way to make dimensions zero to zero. This is why there are tolerances.
Every design engineer understands that his part, which he has developed, will be manufactured in machine shops. And when the technologist gets acquainted with these drawings, he will have questions and one of them will be - where are the size tolerances? Yes, there are surfaces that need to be made very precisely, not only in geometry, but also in purity, that is, roughness. But such dimensional accuracy is not always necessary, and the most accurate ones have a tolerance field. After all, metalworking equipment has deviations in geometric accuracy and cannot keep the size stable. There is also an error of the tool, fixtures, etc. And if the designer does not know the processes of manufacturing his parts in the workshop, then this is very bad, but fortunately it is very rare. I want to wish only one thing, put down the tolerances and landings.
Негізгі бет Ғылым және технология SIZE TOLERANCES - Graphic designation of the tolerance field
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