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FULL R vs R 2

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wearules

wearules

Mechanical
Aug 19, 2015
6
I suggested my coworker remove 'FULL' from a filleted edge radius callout. He asked why. Good question. I tried searching through ASME Y14.5 and couldn't find when to use the callout. I believe I've only ever seen it on a slot callout. But even then, I didn't see 'FULL' notated in the manual for slots either. Has anyone seen 'FULL' used on a radius example in the ASME manual and where?
 
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"Full" is just folklore, from what I can tell.
 
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ASME Y14.5 makes distinction between fully rounded ends and partially rounded ends for slots, but provides no symbology for "full" radii.
This is as close as I could get to the idea of "full" radius.

Short explanation, courtesy of Genium Manual:

Capture_wnbfrc.png


"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
 
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This begs the tongue-in-cheek question: What is a PARTIAL RADIUS? Just thinking...not looking for a response.

Certified Sr. GD&T Professional
 
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TheTick said:
"Full" is just folklore, from what I can tell.
Click to expand...

I have seen the term "FULL[ ]RAD" used, but not recently, and not on an ANSI/ASME compliant drawing. The term "FULL[ ]R" appears nowhere in the standard.

--
JHG
 
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mkcski, you define your question ("What is a PARTIAL RADIUS?") as "tongue in cheek" and don't want a response.

If you actually wanted a response I could direct you to ASME Y14.5 2009 - the end of para. 1.8.4 and fig. 1-30. Oops, just did anyway.
 
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Sem D220: Yes a partial radius feature can exist, but the definition of the geometry is carried by the pictorial and not the word PARTIAL. Same for full radii. My intent was the drawing symbols(words)PARTIAL R vs FULL R which are not in Y14.5

Certified Sr. GD&T Professional
 
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mkcski, it's true that there are no such standardized notes in Y14.5, but the terms "fully rounded ends" and "partially rounded ends" appear in the text of the standard and can be interpreted according to it. Must all drawing notes be exact quotes of the notes that are written in capital letters in the standard and "are intended to appear on finished drawings" per para. 1.1.5? This is a sincere question.
 
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SEM D200: If I understand you response correctly: The paragraph text describing the symbols and the captions on the figures are NOT intended to be used on the drawings. Only the symbols "inside" the figure frames are to be used on drawings to define the part requirements

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It could be interesting to ask WHY OP's coworker wanted to place "FULL" into radius callout.
If the intention was to make sure that radius is tangent to adjacent surfaces, could Controlled Radius do the trick?

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
 
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SEM D220: I don't want to imply that only TEXT in the standard can be used. The standard does not cover every possibility. But when you use the symbols and apply them in accordance with the standard you get the meaning per Y14.5. You can put anything on the drawing that is required to fully define the part. So "creativity" is necessary sometimes. But not using text/symbols per the standard make them non-standard and defeats the purpose. Clarity of intent is the goal.

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mkcski, I see your point.

I wonder how he "2X R" symbology for a slot or any feature on which it is applied should be interpreted in terms of inspection. Given that what controls the radius is the as produced width, as stated in the Genium Manual and as presented here by CH, and if the slot geometry is toleranced with +-, does that mean that uniformity of the radius of the fillet is not controlled at all? Or if that is not the case, can a +- tolerance be stated after the R symbol without stating the required radius value (as it is derived from the slot width), to indicate a tolerance zone such as in fig. 2-22 in Y14.5 is needed?
 
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CheckerHater,

When I saw the term "FULL[ ]RAD" on a drawing, the drafter told me that it meant the radius was tangential to both sides of a slot. I now no idea of how the machine shop interpreted it. This is the problem ASME Y14.5 addresses.

--
JHG
 
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The text of standard is (more or less) clear: "For fully rounded ends, the radii are indicated but not dimensioned."

And it stays this way since at least 1966 (There was enough time to learn it, right?).

Some confusion probably started with 1994 standard introducing Controlled radius. Until then radii were tangent by default (except partially rounded features that had to be dimensioned accordingly).

Still, no word "FULL" anywhere.





"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
 
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