Surface profile tolerance refers to the total allowable deviation of the measured actual elements from the ideal profile surface. It is used to control the shape or position error of space surface. When the surface contour is not marked with datum, it belongs to shape tolerance. When the surface contour has marked datum, it belongs to position tolerance.
There is no reference requirement for the marking of line profile tolerance and the meaning of tolerance zone. The tolerance zone is the area between two envelopes of a series of circles with a diameter of tolerance value t, and the center of each circle is located on the ideal contour line. The tolerance zone with reference requirements is the area defined by two enveloping lines of a series of circles, the diameters of which are equal to the tolerance value t, and the centers of which are located on the theoretically correct geometric shape of the measured component determined by the reference plane A and the reference plane B..
Extended data:
The tolerance zone is an area defined by two enveloping surfaces of a series of spheres. The diameter of the sphere is the tolerance value t, and the center of the sphere is located in the theoretically correct shape of the measured component. ?
The tolerance zone is an area defined by two enveloping surfaces of a series of spheres, the diameter of which is the tolerance value t, and its center is located on the theoretically correct geometric shape of the measuring element determined by the datum plane.
Because it is very difficult to make a theoretical profile template, this measurement method is suitable for the detection of a part in mass production. When using the three-coordinate measuring device to measure, only the CAD mathematical model of the part (three-dimensional design graphics of the part) is needed, so the measuring method is suitable for any occasion and the measured data is reliable.
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