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Hey CH, Thank you for your reply’s, It has definitely made me think. I have had a second look at the figures as tried to do some sketching on my own. In the last figure you sent I believe the perpendicularity zone is to large. I have uploaded a modified figure with perpendicularity zone in...

Hey, If I got my question answered, well somewhat: So my original question was how flatness combined with circular run out would refine the perpendicularity for circular symmetric parts. From the discussion and some thinking on my own: My impression now is that it will refine it to the axial...

So design purpose of what I am doing is to make the gap size as small as possible, with no collision and zero added cost. That is why want to use ISO 2768 for tolerances. I can off-course just increase the gap size to something huge, just wont look as good, or add a perpendicularity tolerance...

So the reason why I am trying to figure this out, (besides trying to understand the basics) is because of a stackup, much simplified figure is attached. I will use the perpendicularity in addition the size tolerance to calculate the extreme values of the gap however it seems to me that using...

Thank you, that is a really illustrative description and figure! Just one thing I am not completely sure of; in the figure it looks like sum of the flatness tolerance and the circular run out tolerance refines the zone within which the surface lies. If flatness and run out is within speck then...

Hi, I don't belie there is a reason to refer to B and C in the hole potion tolerance. By calling out |POSTION| 0.3 |A | instead, you will be saying the same thing in a more "standard" way.. The holes have to be in position relative to each other and dtm A. Note that while this secures the...

Surface A and B are perpendicular to Ø25 and Ø15, marked surface C and D in the updated drawing. The reason I am not calling out datums is because these are general tolerances. With no designated bearing surfaces, I believe the standard calls for the longer of surfaces to be used as the datum...

Hey, First time poster here at eng tips :-) here is a question on general tolerancing according to iso 2768: For circular symmetric parts using general tolerancing according to ISO 2768: Will the circular run out criteria combined with the flatness criteria indirectly control the...