In such a case, each surface has an independent tolerance zone Flatness controls the form of each surface separately, and does not control the position or the relative orientation between the two surfaces. The Profile symbol refers to the two surfaces as a pattern – therefore, since the two surfaces in the drawing have a common plane, the tolerance zone is also common to both surfaces, and the design intent is maintained.įlatness is a tolerance used for form alone, and is not able to control position and orientation of surfaces (not even within a group). To improve the accuracy of the part’s assembly, a release was made between the desired contact surfaces in the assembly, and material was removed from the surface, leaving two contact surfaces that need to maintain a single plane in an accuracy level of 0.05, as presented in Figure 2. In Figure 1, the controlled element is a single surface, in both cases the tolerance zone is: two parallel planes with a distance between them of up to 0.05. The design intent is that the bottom side is the main interfacing surface of the part and it has to maintain a flatness of 0.05. The figures below present two alternatives for an adapter plate. (ASME Y14.5-2009) Among the GD&T symbols there are overlapping areas, in some cases there is no difference in functionality when applying one control method or another. TES Method-straightforward, practical approach.GD&T Specialization and Application Workshop. Model based reduced dimensions drawings.Fundamentals of GD&T for Production Workers.Geometric Product Specification Fundamentals – Practical approach Public course.Geometric Product Specification Fundamentals – Practical approach.What is the difference between |A|B|, |B|A|, |A-B|?.Symmetry & Center Lines are not the same.
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