Number of Decimals in a Position FCF
Number of Decimals in a Position FCF
(OP)
We are still using ASME Y14.5M-1982 for our commercial drawings. I have 4 position tolerences on a drawing with three place dimensions/tolerences. When using a feature control frame on a inch dimension, does the number of decimals in the F.C.F have to be the same number as in the dimension/tolerance it is attached to?





RE: Number of Decimals in a Position FCF
A4 says "The number of decimal places to be used in a dimension and asociated tolerances for unilateral, bilateral, basic, or limit dimensioning is presented for both metric or inch applications."
So it doesn't explicitly list any change on the issue of number of decimals in dimension & tolerance matching.
1994 says that yes they have to match.
So, I'd guess that at 1982 they have to match.
KENAT, probably the least qualified checker you'll ever meet...
RE: Number of Decimals in a Position FCF
According to the 1982 version which I just did look at, the examples do not bear out the necessity for the same number of decimal places in both. This is not NECESSARILY born out by the text. I did not go beyond the examples.
RE: Number of Decimals in a Position FCF
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: Number of Decimals in a Position FCF
RE: Number of Decimals in a Position FCF
Believe it if you need it or leave it if you dare. - Robert Hunter
RE: Number of Decimals in a Position FCF
It seems to me that it was shown that way in Lowell Foster's "Geometrics II & III" books, but I don't have one available now to check it out.