![]() ![]() ![]() The boundary that cannot be violated remains at 31.1, and when we use the MMC modifier, we like to call this boundary a Virtual Condition Boundary. And when the actual part is produced at the LMC size of 29, the size of the tolerance zone is 2.1 This additional flatness tolerance that we are allowed as a result of the actual size departing from MMC is called Bonus Tolerance. So when the actual part is produced at size 30, the size of the tolerance zone is 1.1. As the size of the part gets smaller, the size of the tolerance zone grows by an amount equal to how far the actual size is away from the MMC size. Now with the MMC symbol, the flatness tolerance of 0.1 applies at the MMC size of 31. So until now the tolerance zone was 0.1 no matter if the actual part were produced at its MMC size of 31 or its LMC size of 29 or anywhere in between. Without that symbol, the flatness tolerance was Regardless of Feature Size ( RFS). In the figure below, we have the MMC symbol inside the feature control frame. ![]() We can now introduce the concept of Bonus Tolerance. ![]()
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