1. Mechanical drawing form and position tolerance: including form tolerance and position tolerance.
2. The machined parts not only have dimensional tolerance, but also inevitably have differences between the actual shape or mutual position of the points, lines and surfaces constituting the geometric features of the parts and the shape and mutual position specified by the ideal geometry. This difference in shape is the shape tolerance, and the difference in mutual position is the position tolerance, collectively called the form and position tolerance.
What does geometric tolerance mean
3. See the following figure: 1) Shape tolerance: shape tolerance refers to the total amount of variation allowed by the shape of a single actual feature.
What does geometric tolerance mean
4. The form tolerance is expressed by the form tolerance zone.
5. The shape tolerance zone includes four elements: the shape, direction, position and size of the tolerance zone.
6. Form tolerance items include: straightness, flatness, roundness, cylindricity, line profile, and surface profile.
7. Generally speaking, shape tolerance is the element related to shape.
8. 2) Position tolerance: position tolerance refers to the total amount of variation allowed by the position of the associated actual feature to the datum.
What does geometric tolerance mean