Positioning tolerance is divided into coaxial (core) degree tolerance, symmetry degree tolerance and position degree tolerance, as followsBillion lerideTell you what they say and what their tolerance zones are.

    1.Coaxial (heart) degree:
    The symbol is one large and one small concentric circle (◎Indicates that the measured axis on the part is relative to the reference axis and remains in the same straight line.
    Tolerance zoneYes diameter is tolerance valuet, and the area in the cylinder coaxial with the datum axis.
    2.Degree of symmetry:
    The symbol is three horizontal lines with a horizontal length in the middle, indicating that the two symmetrical center elements on the part remain in the same plane.
    Tolerance zoneYes distance is tolerance valuetAnd the area between two parallel planes (or lines) that are symmetrically configured relative to the reference center plane (or center line, axis). If two directions are given that are perpendicular to each other, the normal section is the tolerance valuet1Xt2The region within the quadrilateral prism.
    3.Position degree:
    The symbol is a circle with two perpendicular lines to each other, indicating the point, line, surface and other elements on the part, with respect to its ideal position.
    Tolerance zone
    (1) point position degree:The tolerance zone is the tolerance value of the diametertThe area within a circle or sphere centered on the ideal position of a point.
    (2Line position degree:When a direction is given, the tolerance zone is where the distance is the tolerance valuetAnd the area between two parallel planes (or lines) symmetrically configured with the ideal position of the line as the center; When two directions are given that are perpendicular to each other, the normal section is the tolerance valuet1Xt2, and the area within a quadrilateral prism with the ideal position of the line as the axis.
    (3Position degree of the surface:The tolerance zone is where the distance is the tolerance valuetAnd an area between two parallel planes symmetrically configured with the ideal position of the surface as the center.
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