yang686526

undimensioned tolerance
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?
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there should be a tolerance block somewhere on the drawing format. that, or a note stating that untoleranced dimensions are basic.
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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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.
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.
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).
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