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Tolerance symbol interpretation

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Hi,

I've been studying dimensioning and tolerancing for a while but I do not know how to interpret when one symbol of surface profile tolerance has two attached values. (No datum feature or any other symbol is used.)

Thanks in advance!

 

double surface profile notation picture.PNG

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The 0.010 tolerance zone is stationary relative to your main datum.  The 0.002 tolerance zone is free to move within the 0.010 tolerance zone.  The 0.002 zone can move up and down and side to side within the 0.010 tolerance zone.  So the 0.002 tolerance zone does not refine the movement up/down or side to side. However, the 0.002 zone is constantly parallel to main datum.  Therefore the 0.002 tolerance zone refines the amount that the profile is able to rotate (the orientation) relative to main datum.

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My interpretation is: Lower portion combine profile tolerance is to refine orientation of the profile in-between respect each other as pattern. Top .010 tolerance is to define positioning of the pattern, bottom .002 is to refine positioning between two slot.  

image.png.041c85fdbf420d6647d4159a887a7084.png

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if you have no reference, it's an incomplete drawing, just think, how would you mesure it?  it's so incomplete that there are at least 3 ways to comply with that dimensions. What piliolittle sed it's a possibility but that is right and clear only if the datum reference is positioned in the right place of the dimension. also there are ways to express the chain line with out all that arrows. remember, in every drawing where GD&T is apply there most be an origin, and in this case has to be a 3 axis defined origin  

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