Strange Notation on Fillet Radius

[jasoncwells]

I've never seen this before. This is taken from SAE J1231 figure 1. What does that notation mean on the fillet radiuses of the hose barb? Specifically, what is the 0.50/ before the 2.25R and the 0.25/ before the 1.00R?

Regards,
Jason

 

[3DDave]

It's likely to be dimension limits.

 

[PeterStock]

Does the standard state what standard is used for drawing interpretation? ASME or ISO and what year? The datum symbol shown is to an old standard. As a guess, I am thinking that the dimensions you are questioning are limit dimensions and the the radii range from 0.50 to 2.25 and from 0.25 to 1.00 mm for the two dimensions. In the current ASME standard this would be shown as R 0.5-2.25 and R 0.25-1 with the trailing zeros removed.

Peter Stockhausen
Designer / Checker

 

[SeasonLee]

Datum feature reference E come before the tolerance 0.25, that is ANSI Y14.5M-1973 standard, so the print is about 50 years old, may be you can find out the answer if you own a copy of 1973 edition.

Season

 

[dgallup]

Certainly looks like limit dimensions to me.

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[jasoncwells]

SAE needs to get with the 21st century then. They originally wrote the spec in 1978. They revised it in 2008 so they apparently didn't update their figures then.

Thanks, guys. I'll interpret that as limits. I just wanted to make sure it wasn't some other esoteric thing.