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Gd&t symbol for flatness12/26/2023 Extension lines can be used to clarify which surfaces are to be considered, however is not necessary. If an additional control is applied the feature of size, for instance perpendicularity as see above, this perpendicularity would be applied to all three cylinders as if they were one cylinder. When the Continuous Feature Symbol is applied as seen above, Rule #1 would be applied to the 3 cylinders as if there were no interruption. Without the Continuous Feature Symbol, these three cylinders would ordinarily be able to deform in differing directions in form and location by the maximum amount allowed by either Rule #1 or any geometric controls placed on the feature. This means the feature of size in question, like the boss below interrupted by the O-ring grooves, would be controlled as a single feature. The 2009 edition of this Geometric Dimensioning and Tolerancing standard introduces the use of the Continuous Feature symbol as it to be used on features of size. Continuous Feature with the ASME Y14.5 – 2009 Standard: The symbol has differing capabilities when considering ASME Y14.5 – 2009 vs 2018. Rule #1 and any geometric controls will be applied to the disjointed features as if they are one feature. The Continuous Feature Symbol is used to indicate that a group of disjointed features or surfaces are to be considered as one continuous feature.
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