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Mar 30, 2021 · The flatness callout controls the uniformity of a surface or a median plane as needed. It defines two parallel planes on either side of the flat surface as the tolerance zone for the surface. All the points on the specified surface must lie between these two planes for part approval.
Flatness is the 3D version of surface straightness – Instead of the tolerance zone between two lines; the tolerance zone exists between two planes. When Used: When you want to constrain the amount of waviness or variation in a surface without tightening the dimensional tolerance of said surface.
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Two things to note about flatness for a feature of size (Flatness DMP) compared to surface flatness: Flatness, as applied to a feature of size, automatically overrides Rule #1 of Geometric Dimensioning and Tolerancing.
Flatness is a GD&T form tolerance that is conceptually simple. According to the ASME Y14.5 standard , it “specifies a tolerance zone defined by two parallel planes within which the surface must lie.”
www.runsom.com · straightness-vs-flatness-in-gdtStraightness vs. Flatness in GD&T - Runsom Precision
In GD&T, straightness and flatness are two separate characteristics utilized to control the form of lines/edges and surfaces, respectively. Straightness ensures that a line or feature remains within a designated tolerance zone, while flatness ensures the planar shape of a surface.
- Flatness with an MMC modifier can create confusion since flatness is considered a form control, and form controls typically do not work with materi...
- The bonus tolerance is an additional tolerance that applies when the straightness callout includes a maximum material condition (MMC) modifier. In...
- Straightness is a valuable control when two parts in an assembly require line contact. By applying straightness, we can mark the mating surface and...
- The derived median line is formed by connecting the median points at each cross-section of a part. This median line must meet the criteria specifie...
Feb 17, 2024 · In this article, we will discuss what is flatness in GD&T, the flatness callout, explain how to measure flatness, and present a short comparison of straightness vs flatness.
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Oct 9, 2023 · Jason discusses form controls on a per unit basis using the example of controlling flatness on a large surface in this Question Line Video. We received a question from a student, wanting clarification on a feature control frame calling out flatness.
