GD&T question: Measuring basic dimensions

S

sept68

#11
You shouldn't be glossing over anything. Basic dimensions are used to validate part geometry as defined in feature control frames.

If there are features that have basic dimensions defining their location or orientation without an associated feature control frame, then the print IS improperly dimensioned. If, as previous respondents have postulated, the engineer is indicating basic dimensions as meaning reference dimensions, the print IS also improperly dimensioned.

Good luck, though, trying to get engineering to admit when they improperly draft things. "I've always done it that way." is their mantra.
Very interesting. Never really considered our prints being improperly dimensioned. Our prints have always been this way. I think part of my problem is the ASME standard. Any challenge to engineering and in most cases the customer must be backed up by the bible. What case could I make to have Basic Dimensions used as Reference Dimensions removed from prints?
 
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Stijloor

Staff member
Super Moderator
#13
Very interesting. Never really considered our prints being improperly dimensioned. Our prints have always been this way. I think part of my problem is the ASME standard. Any challenge to engineering and in most cases the customer must be backed up by the bible. What case could I make to have Basic Dimensions used as Reference Dimensions removed from prints?
By providing them with the proper convention for reference dimensions.

A dimension placed between parentheses is for reference only.

Hope this helps.

Stijloor.
 

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#14
What case could I make to have Basic Dimensions used as Reference Dimensions removed from prints?
I think that the fact it is blatantly wrong based on the intent of the designer would be the basis of the case you need to make. If they mean reference, place parenthesis around the dimension. If it is basic, then place a box around it, and identify the zone about the "perfect location" that is acceptable with a feature control frame. Those are the two acceptable options.
 

Stijloor

Staff member
Super Moderator
#15
I think that the fact it is blatantly wrong based on the intent of the designer would be the basis of the case you need to make. If they mean reference, place parenthesis around the dimension. If it is basic, then place a box around it, and identify the zone about the "perfect location" that is acceptable with a feature control frame. Those are the two acceptable options.
Absolutely! GD&T competency is regretfully lacking.

Stijloor.
 
D

David DeLong

#18
Absolutely! GD&T competency is regretfully lacking.

Stijloor.
Yes it certainly is but right now companies can not afford to get training since most are just trying to survive his recession. The phones just don't ring anymore except for telemarketers.
 

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#19
Yes it certainly is but right now companies can not afford to get training since most are just trying to survive his recession. The phones just don't ring anymore except for telemarketers.
There is never a good time.... Either too busy, or not enough money from slow sales. But, still...
 

Jim Wynne

Staff member
Admin
#20
Very interesting. Never really considered our prints being improperly dimensioned. Our prints have always been this way. I think part of my problem is the ASME standard. Any challenge to engineering and in most cases the customer must be backed up by the bible. What case could I make to have Basic Dimensions used as Reference Dimensions removed from prints?
Just out of curiousity, do your drawings cite the standard? If they don't then the symbols can mean whatever anyone wants them to mean.
 
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