DIN6930 What table to use - Tolerances of straight line and radii measurements

M

mandmgray

#1
This standard has a table for tolerances of straight line measurements and one for tolerances of radii. Which of these would apply to a diameter? Intuitively, one might think that the radius table applies since it is a curved surface like the diameter. However, throughout the std. you can see examples where diameters are dimensioned as straight line measurements, so this makes me think the straight line measurement table applies. A diameter can be measured with a ruler like other straight line measurements, whereas a radius cannot. Is this correct? Is it defined somewhere how to apply these types of standards to a diameter? This is important in resolving a 5 figure dispute with a vendor. Thanks.
 
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M

mandmgray

#2
Any information at all would be appreciated. If nothing else, can you direct me to another source of information? Thanks.
 

Jim Wynne

Staff member
Admin
#4
This standard has a table for tolerances of straight line measurements and one for tolerances of radii. Which of these would apply to a diameter? Intuitively, one might think that the radius table applies since it is a curved surface like the diameter. However, throughout the std. you can see examples where diameters are dimensioned as straight line measurements, so this makes me think the straight line measurement table applies. A diameter can be measured with a ruler like other straight line measurements, whereas a radius cannot. Is this correct? Is it defined somewhere how to apply these types of standards to a diameter? This is important in resolving a 5 figure dispute with a vendor. Thanks.
You might want to look at this discussion thread:
What is DIN 6930-2 Standard?.

It appears that you're using 6930-2, and there should be a suffix that indicates specific tolerances (see my post in the linked thread).

Whether you use a radius tolerance or a straight-line tolerance depends on how the feature is specified. If it's specified as a radius, use the radius tolerance. If it's specified as a diameter, a diameter is always a straight line, so in the absence of clarification from a designer or customer (which you should seek) I would think the straight-line tolerance would apply.

Note that the standard in question was apparently withdrawn (i.e., made obsolete) some time ago (again, see the link in my post in the other thread).
 
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