undimensioned tolerance

[sunthorn]

I have a drawing that states the following :
Interpret drawing per ASMY14.100-200, dimensions and tolerances per ASME Y14.5M.


In the drawing all the dimensions in the drawing are untoleranced. Do I interpret these as basic dimensions?

 

[ewh]

There should be a tolerance block somewhere on the drawing format. That, or a note stating that untoleranced dimensions are basic.

 

[Heckler]

It's not uncommon to place that in a note "all untoleranced dimensions are basic" but you must also account for all permissible geometric variations. This can be done by having a global note stating a general surface profile. I've seen this on complex castings.

Best Regards,

Heckler
Sr. Mechanical Engineer
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[EngJW]

We also use "all dimensions are reference"

We do this if we buy a part as is and just want some dimensions for information purposes. It allows a receiving inspector to verify that we have a 1/4-20 x 1 inch long bolt, but he doesn't have to do a layout on the part.

 

[sunthorn]

Thanks to all that replied.

It turns out I was not given all the information. I only recieved the drawing not the specification sheet with the tolerance block.

 

[xgrigorix]

Seems a little queer that someone would put a tolerance block on a separate specification sheet, instead of on the drawing (where it would actually be useful).

 

[Tunalover]

sunthorn-
Maybe this is pulling hairs, but the drawing should simply say "INTERPRET DRAWING PER ASME Y14.100M." Since Y14.100M invokes Y14.5M, then it's redundant to invoke them both. Also I BELIEVE that Y14.100M says that the year of the standard should be left out of the callout (you might want to confirm this!).




Tunalover