Technical Drawing Question

Hi, if my post is in the wrong section please be so kind & let me know. Same goes to :If this kind of question is already somewhere posted.

Now, i got a technical drawing that gives me a measure "Roundness with a Maximum condition".(its a shaft detail)
My issue with this measure is that it asks a roundness w/o any deviation. Also it gives me a maximum condition so called tolerance(or bonus). Shouldn't there be a +/- tolerance for this. If my question is unclear let me know & i will try to rephrase it.

Thanks in advance!

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AndersI over 4 years ago

I assume you also have a size dimension for the shaft? All the tolerance you have for the roundness comes from the size bonus.
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DAN_M over 4 years ago in reply to AndersI

I respectfully disagree. I could be totally wrong, though. I don't have a copy of 14.5M with me.

My train of thought-->

A material modifier is used for positional tolerances. The part being at LMC or MMC gives could yield POSITIONAL wiggle room.

If their intent was to control the shape but say that the shape could vary based on part size, they should have used something like a profile of surface call-out with a "U" modifier and then place a tighter control on the diameter itself.
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DAN_M over 4 years ago in reply to AndersI

I respectfully disagree. I could be totally wrong, though. I don't have a copy of 14.5M with me.

My train of thought-->

A material modifier is used for positional tolerances. The part being at LMC or MMC gives could yield POSITIONAL wiggle room.

If their intent was to control the shape but say that the shape could vary based on part size, they should have used something like a profile of surface call-out with a "U" modifier and then place a tighter control on the diameter itself.
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