Before we talked about the form and position tolerance is divided into shape tolerance and position tolerance, and shape tolerance is divided into straightness, flatness, roundness, cylindricity, line profile and surface profile, the following isBillion lerideLet's introduce their definition!

1.Straightness:The symbol is a short horizontal line (－), indicating that the actual shape of the straight line element on the part maintains an ideal straight line, and the tolerance zone is the distance for the tolerance valuetTwo parallel lines/plane/The area between columns, etc.
2.Flatness:The symbol is a parallelogram, indicating that the actual shape of the plane element of the part maintains an ideal plane, and the tolerance zone is the distance for the tolerance valuetThe region between two parallel planes.
3.Roundness:The symbol is a circle (○Represents the actual shape of the element of the circle on the part, and maintains the condition of equidistance from its center, and the tolerance zone is the tolerance value of the radius difference on the same normal sectiontThe region between the two concentric circles.
4.Cylindricity:The symbol is a circle sandwiched between two diagonal lines (/○/Represents the points on the outline of the cylindrical surface of the part, and maintains an isometric distance from its axis, and the tolerance zone is the radius difference of the tolerance valuetThe region between two coaxial cylinders.
5.Line profile:A curve marked with a convex (⌒), the tolerance area is limited to a width oftThe center of the two envelope curves is located on the ideal geometry.
6.Surface profile:A semicircle with an upward sign is an index that limits the change of the actual surface to its ideal surface, and is the shape accuracy requirement for the surface on the part, and the tolerance area is limited to the width oftThe center of the two envelope surfaces is located on the ideal geometry.
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