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flatness symbol on shaft diameter

flatness symbol on shaft diameter

flatness symbol on shaft diameter

(OP)
hello - this is my 2nd post here regarding the use of a flatness symbol on a round shaft - am i going nuts here or maybe someone here can shed some light on this -
the person who created this drawing has had aerospace experience from a highly visable company & i just am not too sure if i should challange him on the use of this
symbol in this regard - i am attaching a pic for reference - i have never seen this before - thank you in advance

RE: flatness symbol on shaft diameter

Is this an ISO drawing? If it is I don't know if it's an appropriate callout. If it's an ANSI then I think that cylindricity or maybe straightness, depending on the intent, would be the correct callout.

Han primo incensus

RE: flatness symbol on shaft diameter

Go ahead and challenge.

RE: flatness symbol on shaft diameter

I would challenge that one, too!

RE: flatness symbol on shaft diameter

Challenge.

But being myself I am also curious, is datum A axis of the shaft or the same flat feature Flatness is applied to?

RE: flatness symbol on shaft diameter

(OP)
hello again & thank you so much - datum a is the main shaft dia. itself w/ the flatness datum applied to that same diameter - this is not an iso drawing -
most around here would not even know what iso is let alone try & explain it - it really bothers me how this and other drawings made it through our
shop for manufacturing & even so far as inspection (all done accross the pond) - this also was not just a mistake -
i believe that the person who did this really has no "supposed" knowledge of geo tolerance & then this drawing was used to make similar parts in which the same error occurred -
it has become extremely sloppy all around - thank you for the rant forum & as far as a challange i am way too low on the ladder to challenge an m.e. manager on this -
just glad to know i am not totally nuts - (yet)

RE: flatness symbol on shaft diameter

duk748,
So if it is not ISO, is there any tolerancing standard invoked on the print? Perhaps ASME Y14.5?
There is another thing that looks suspect. If, by any chance, Rule #1 (aka Envelope Principle) is in charge, switching the symbol to straightness or cylindricty will not help - the value of this geometric tolerance shall not be greater than .025, that is total size tolerance of diameter 50.

RE: flatness symbol on shaft diameter

(OP)
hello again & thank you - yes you are right - there is no real "standard" applied to this drawing - it is a hodge podge of standards since we have no standard - i believe you are right that the tolerance on the shaft is less then the allowable tolerance of the datum symbol - i have already re-drawn the shaft to correct the problem - it would have taken more time for me to explain the right application
then to just fix the drawing & go on - sad state of affairs here - thank you again

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