How to Tolerance Dimension Having Zero Nominal Value?

[Ryan1220]

Hi,
Does anyone have any suggestions on how to go about dimensioning and toleranceing in a situation where two surfaces ideally need to be flush but in this case a 1mm overhang and 1.5mm inset is permissable?

I've attached an image showing what I'm trying to do.

I've often been asked to add a limit to two mating parts that have a nominal position equal to zero as in this case.

Thanks!
Ryan

 

[drawoh]

Ryan1220,

Read up on GD&T profile tolerances.

--
JHG

 

[Ryan1220]

Thank you!