True Position Question

J

Jack N

#1
If I?ve posted this in the wrong spot please let me know.

I have a couple of co-workers who are misinformed about a true position tolerance zone when the diametrical tolerance zone symbol is not used. They are of the belief that they get the stated amount of tolerance in any direction. IE: If the FCF said .005? tolerance, they believe they get a diametrical tolerance zone that?s .010? across.

I?ve spent hours looking through old books and on-line trying to find something that would show them how it really works. I?ve found all kinds of stuff for the diametrical callouts, but oddly enough I haven?t been able to find a single thing that describes & shows how true position works without the diametrical modifier. Does anybody have something from a standards book (preferably) or a training book that deals with this specifically?

Thanks.
 
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