Tolerance Stack up Help

[Vishal2015]

Dear Friends,

Please help me to find the Maximum and minimum gap.

I have similar drawings from one of my supplier.

The dimensioning scheme and the 10° angle is making trouble to do the stack up analysis.

Please provide your views and help me solving this stack up.

Thank you.

 

[greenimi]

In order for you to do a correct stackup calculation, the angled surface (on both component/ mating parts) should be defined with profile (not with flatness) and 10 degrees angle should be basic.
Maybe the datum reference frame in the "new profile" is made up by the planar surface (primary) and the pattern of the 4 mounting holes at MMB (secondary).
Then, the min-max gap could be accurately evaluated.

 

[drawoh]

Vishal2015,

I agree that GD&T profile and angle tolerances are way more appropriate for this, and I do not intend to knock myself out analyzing this. You have two [±]0.5mm dimensional tolerances and two flatness specification of 0.5mm. The flatness specifications each use up 0.25mm of space. That works out to 2[×]0.5mm+2[×]0.25mm=1.5mmm. One the piece to the right, your angle error is multiplied by 80mm. 80mm[×]sin[ ]0.5[°]=0.7mm. That puts us over 2mm.

You obviously are using 3D[ ]CAD. Have you tried modelling the parts with the errors?

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JHG