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2, section calculation formula
The understanding of surface contour can be understood from the surface contour between planes, and then the surface contour of a surface is actually the same as that of a plane, and the position of the size can be controlled as well as the position. Of course, it can include the control of direction and shape.
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Step 3 be honest
Limit the shape tolerance of the actual straight line from the ideal straight line.
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4, flatness
Refers to the deviation between the macro concave-convex height of the substrate and the ideal plane.
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5. circle
Refers to the degree to which the cross section of the workpiece is close to the theoretical circle.
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6, cylindricity
It means that the difference between the largest dimension and the smallest dimension of any vertical section is cylindricity.
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7. Line outline
It is a requirement for the shape of the curve, and it is also an index to limit the change of the actual curve to the ideal curve.
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8, surface contour
Refers to the change of the measured actual contour relative to the ideal contour.
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9. Parallel
A maximum permissible error whose plane (edge) is parallel to another plane.
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10, verticality
Evaluate the vertical state between lines, planes or lines and planes.
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1 1 dip angle
Refers to the degree of inclination and skew of an object or inclined plane and the angle with the ground.
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12 position
The allowable variation range of the actual position of an object's axis or central plane relative to the theoretical position.
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13 coaxial (concentric) degree
The degree to which the axis of the clamping part of the material testing machine is coaxial with the axis of the stress direction under given conditions.
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14 symmetry
The condition that two symmetrical central elements on a part remain on the same central plane.
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15 loop jump
The difference between the maximum and minimum readings measured by the fixed indicator in a given direction when the measured element rotates around the reference axis once.
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16 full jump
It is the allowable deviation of the actually measured elements on the ideal surface of revolution.