Gentlemen, regarding the issue of geometric tolerances
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As shown in the figure, as long as there are datums A and B, it's enough. As long as the axis meets the position requirements between datums A and B, it's fine. Why do we need to add datum C? Isn’t it possible without a C benchmark? And shouldn’t the verticality between the axis and the c datum be marked?
This post was last edited by lijie2007521 on 2022-5-14 16:07. The picture in the picture is the position. The ideal position of the axis is determined by the theoretically correct dimensions relative to the system of three base planes. This position tolerance gives two mutually perpendicular directions relative to the datum. The meaning of 0.1 is that the axes of each measured hole must be located in two pairs of mutually perpendicular distances with a tolerance value of 0.1mm. Between two parallel planes arranged symmetrically in an ideal position determined by the theoretically correct dimensions relative to the reference surfaces A, B, and C. Hope this explanation helps you.