Drawing (print) does not specify restrained or free state

[Damien.M]

My company primarily makes engine gaskets and I'm new to the GD&T and interpreting drawings and blueprints. However, I was looking at a blue print of a muffler gasket and noticed there was no indication of whether the measurements were taken in a free state or constrained state.

If it does not specify does it mean that the engineer forgot to include it? Or do I just assume that it was measured in a free state?

And one more thing, if there is a note that reads "gaskets are to be measured in constrained state", does that mean a free state modifier is needed?

Sorry to you all if my question lacks details for an adequate answer is to be possible.

 

[Ron Rompen]

The norm (IMHO) would be that, unless specified on the drawing, the measurements would apply in the free state.

With that being said, it would be in your best interests to confirm this with the customer - you are obviously aware that there is a POSSIBLE discrepancy in the drawing, and it is always a good idea to ensure that everyone is in agreement on the drawing interpretation BEFORE the start of production.

 

[Stijloor]

My company primarily makes engine gaskets and I'm new to the GD&T and interpreting drawings and blueprints. However, I was looking at a blue print of a muffler gasket and noticed there was no indication of whether the measurements were taken in a free state or constrained state.

If it does not specify does it mean that the engineer forgot to include it? Or do I just assume that it was measured in a free state?

And one more thing, if there is a note that reads "gaskets are to be measured in constrained state", does that mean a free state modifier is needed?

Sorry to you all if my question lacks details for an adequate answer is to be possible.

Not knowing what GD&T Standard applies (ISO or ASME), I will use ASME Y14.5-2009. It states on Page 8, Par 1.4 (m): "Unless otherwise specified, all dimensions and tolerances apply in a free-state condition. For exceptions to this rule see paragraphs 4.20 and 5.5.

Par 4.20 "Restrained Condition"

Par 5.5 "Application of free-state symbol"