Basic knowledge of mechanical part drawing--geometric tolerance

Question: what is shape and position tolerance (referred to as geometric tolerance)?

Answer: The surface of the processed part has not only dimensional errors, but also shape and position errors.

These errors not only reduce the accuracy of the parts, but also affect the performance.

Therefore, the national standard stipulates the shape and position tolerance of the part surface, referred to as the shape and position tolerance.


Type, characteristic and symbol of geometric tolerance

 

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