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By definition, perfect form at LMC is not required, so there is no "LMC sphere" it's enough to have "LMC measurements" which are all 8mm.
CH said:Burunduk,
You described it twice, but would you be so kind to draw it?
How exactly "dent" and "bump" look like?
It would not fail the actual local size, it would fail the size limits per the swept spheres requirement. The actual local size measured between opposed points can still be not less than 8 everywhere and in spec. So it eventually depends on what part of the industry those involved belong to - do they evaluate size by two-point measurements or do they sweep spheres.Tarator said:However, you cannot possibly deform a sphere and yet maintain the minimum material (keeping the actual local size 8).
- For an external cylinder: The LMC would be a cylinder, where each cross-section would be a perfect circle of dia 8. According to Rule #1, this cylinder is allowed to deform (bend, twist) within a cylinder of dia 12 (MMC cylinder). If that happens, the IB will be 4.
In other words, a sphere at its LMC will always be a perfect sphere. So the IB will be 8.