Profile of a surface for dimensional tolerance
Profile of a surface for dimensional tolerance
(OP)
Good Morning.
I am working with a customer drawing (see attached PDF)and I am not sure of the way they are using this feature to control tolerance. In this example they claim that the entire part is held to the profile of a surface tolerance, which would be in this case ±2.5mm. I have a few issue's with this but because I deal with this so little I am not sure.
To use this feature wouldnt all of the dimensions have to be basic?
Is this a valid way to measure a distance feature from a datum? Practical?
Does the tolerance block imply ± 2.5, or a range of 5, say if nominal was 30 would a range of 29 to 33.5 be OK.
Are there any flaw's with this control?
I am working with a customer drawing (see attached PDF)and I am not sure of the way they are using this feature to control tolerance. In this example they claim that the entire part is held to the profile of a surface tolerance, which would be in this case ±2.5mm. I have a few issue's with this but because I deal with this so little I am not sure.
To use this feature wouldnt all of the dimensions have to be basic?
Is this a valid way to measure a distance feature from a datum? Practical?
Does the tolerance block imply ± 2.5, or a range of 5, say if nominal was 30 would a range of 29 to 33.5 be OK.
Are there any flaw's with this control?





RE: Profile of a surface for dimensional tolerance
RE: Profile of a surface for dimensional tolerance
Believe it if you need it or leave it if you dare. - Robert Hunter
RE: Profile of a surface for dimensional tolerance
RE: Profile of a surface for dimensional tolerance
"UNLESS OTHERWISE SPECIFIED..."
Maybe it is not a standards compliant drawing. I think the intent is pretty clear.
JHG
RE: Profile of a surface for dimensional tolerance
GD&T should apply on features where there is a function and relationship within the part or to the mating part. I don't think that this applies here but it easy for the Design to apply.
A 5 mm profile means a +/- 2.5 mm from the basic dimension or theoretical dimension.
Dave D.
www.qmsi.ca
RE: Profile of a surface for dimensional tolerance
Also, you haven't supplied us with the complete drawing so I can't commit to a total comment but typically the dimensions shown would be basic and should be stated as such in the title block.
---SolidWorks 2008 SP3.0---