runout - shaft with notch
 

runout - shaft with notch
i have a cylinder shaft with a small flat notch on it roughly centered about the length. i am applying a total runout tolerance to the shaft.
in the drawing view, the shaft is layed out horizontally and the notch is shown on the top surface, while the bottom surface is shown as one continuous line.
how do i specify that the runout applies everywhere but the notch? or is this implied? do i need a fcf on both sides of the notch? from what i could find, asme y14.5-2009 doesn't talk about breaks in the surface where a runout is applied.
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if you apply the runout to the diameter, and the notch isn't the same surface then i'd think it was clear, but i'm not sure i followed all of what you posted.
kenat,
jlang17,
if the face to face tolerance is more important than the centreing of the notches, you can apply a positional tolerance to the dimension.
jhg
it is understood that the total runout is on the full surface of the shaft including the area around the notch but not the notch itself. don't do anything tricky; just show the surface with the total runout value that is needed.
dave d.
thank you dingy2, that's exactly what i needed to know. i wasn't sure if that was assumed or if it needed to be clarified.
if i understand the post correctly, what are you calling out the runout to? you must specify it to a datum. if you simply have a shaft, what will be your datum?
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good point powerhound. if the shaft does not have countersunk ends where datums could be created, then one would place a cylindrical value on the od and it is to itself.
cylindricity combines roundness, straightness of an axis and straightness of a surface.
dave d.
the shaft is my datum and i was referencing the runout to itself. but yes, cylindricity would accomplish the same thing i suppose.
you cannot use circular or total runout in your situation since you are referencing the od. cylindricity is your only option here.
dave d.
i thought it was legal according to asme y14.5-2009 para. 9.5.5: "runout tolerance may be applied to a datum feature and related to the datum axis derived from that datum feature"
i'm applying runout to datum feature a (shaft), thus relating to datum axis a (shaft axis).

first of all, you are probably the only person here who is now using asme y14.5 - 2009 and i hope that your drawing reflects this level in notes. watch out for datums at mmc though since these are quite different from the 94 standard and if you reflect a feature control frame in degrees of freedom, it would blow the minds of the shop floor people. i hope that everyone in your company is well acquainted with all the new changes.
that being said, the 9.5.5 refers to figures 9-6 & 9-7 which are the same examples used in the 94 standard. we have the datum axis derived from 2 features and the circular runout is required on one of the features.
your example is to itself and not 2 features. i know that the words in 9.5.5 say this may be legal but the example reflects something different. i, again, would reflect the od with cylindricity since it is well understood.
dave d.