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For example, if a hole is specified with a free state tolerance for perpendicularity, the tolerance would apply even if the hole deforms slightly due to a clamping force. "
This is wrong. If the tolerance is applied at free state, there must be no clamping forces or elastic deformation when...
The answer for you is the one you like better:
a) They do a half-assed job because they don't get paid for it.
b) Well, at least they don't get paid for that lousy job. Thank God!
But seriously speaking, If I'm not mistaken, the rule that a circularity FCF can't be attached to the dimension is new in 2018, while the figure is a carryover from previous versions.
If we go all the way with those speculations, maybe the purpose is to have the user scratching his head and doubting his understanding, until an ASME-affiliated training provider tells him there is an error in the standard? 🙂
I hope I'm not outside the context of your statement, but <CF> with plus minus size definitely works. That's fundamental, and there are as many as 3 figures in section 5 of Y14.5-2018 that show how it applies Rule #1 simultaneously to the FOS segments seperated by interruptions. It is also my...
Is it far from any sense of reason to say that a basic dimension that locates a surface for a profile control applies to the surface?
Yet we are not supposed to attach a profile FCF to any basic dimension, it should be attached or pointing to the surface or surfaces.
Perpendicularity...
They should've just written one clear, simple rule for the whole topic of placing feature control frames. I've seen drawings where position or profile FCF was attached to a basic locating dimension. The rule should have been straightforward: attach it to a dimension only when the tolerance zone...
Yes there is a discrepancy. The LMC sphere can pass a part that 5.8.1. (e) would reject. Picture a shaft with a wide keyway, and on the opposite side, there's a noticeable crushed area where the metal's been deformed under pressure. The LMC sphere could pass inside with the entire existing...
greenimi,
8-24/2009 is an irregular feature of size that has position applied to at MMC. The possible design intent for something similar is to ensure clearance to a mating component that should fit with a gap in the semi-rectangular opening, while relaxing the requirement as the opening gets...
With a directly toleranced width and rule #1 of Y14.5 intact, you don't need to worry about flatness of each side unless flatness needs to be tighter than the size tolerance, and with some very rare exceptions as in post #13 Here, same goes for parallelism.
Feature of size perpendicularity...
Personally, if the best choice functionally is plus and minus size and a tolerance of position, I would place the CF symbol near the size dimension. Logically, that symbol would also apply to the position feature control frame associated with the size dimension, meaning that if the size is of a...
I would agree with jassco about "These are not pattern of the arc" (post #7).
However I would refine that statement and say that the 8 arcs are not a Pattern per the Y14.5 definition of a pattern unless a position or profile tolerance applies to them and an additional indication such as 8X, 8...
For the 2X composite, the second segment at MMC implies a function of fit with 2 mating components at fixed separation. The upper segment at LMC could be for preserving wall thickness. The LMB for datum feature E in the second segment, apart from resulting from the requirement for the datum...
