surface symbol?
surface symbol?
(OP)
Just came about this drawing. Got two "R" like symbols. I haven't seen anything like this before. Looks like some kind of surface finish symbol. Can anyone please tell me what this means?
Thanks.
Thanks.





RE: surface symbol?
"Art without engineering is dreaming; Engineering without art is calculating."
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RE: surface symbol?
I am thinking that where I saw them used, the meaning was given in the title block.
Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services
www.infotechpr.net
RE: surface symbol?
"Art without engineering is dreaming; Engineering without art is calculating."
Have you read FAQ731-376: Eng-Tips.com Forum Policies to make the best use of these Forums?
RE: surface symbol?
But my memory is hazy on where I might have seen a symbol like that before.
RE: surface symbol?
RE: surface symbol?
I do not know what the squiggly Rs mean, either.
I observe that your drawing was done by hand, with a lettering template. The line work is fairly good with good distiction between the outlines and the dimension lines. The lettering template work is neat. The arrows are a little inconsistent. The two squigglies are fairly sloppy.
Is it possible someone doodled on the original?
Maybe it does not mean anything?
This has to be an old drawing. What would the standard have been, say, twenty years ago?
RE: surface symbol?
Search for "DIN 3141"
RE: surface symbol?
RE: surface symbol?
Chris
SolidWorks 10 SP4.0
ctopher's home
SolidWorks Legion
RE: surface symbol?
The company that it came from is not sure but the latest info from them is like this: The part is a casting & the surfaces on which the two "R"s lay (inside of the bore & outside) should be machined as they need to assemble some sleeves on them.
The funny thing is that a senior guy from my company says that this wavy "R"s mean that surfaces should be left as cast. Can't say which standard but still he's sticking with his opinion.
Thanks.
RE: surface symbol?
- an outwards open triangle means either cutting or deformation process
- a "wave" symbol also means either cutting or deformation process
The "R" like symbol looks like a hybrid of both i.e. open triangle "combined" with the "wave" symbol?!
Strange!
RE: surface symbol?
As i said... DIN 3141 or DIN 140!
RE: surface symbol?
"a wave symbol also means either cutting or deformation process" - INCORRECT!
The wave would probably mean:
Surface NOT obtained by cutting or deformation. It is casted.
RE: surface symbol?
This is consistent with my guess.
RE: surface symbol?
But I can't find anything like the "R"s. There's a wave symbol in the aforementioned list but it looks different from the "R" in the drawing. The wave, as 321GO said, indicates surface roughness typical for casting.
Thanks.
RE: surface symbol?
With the different scripts (consider the way the nummber 1 is written in the US vs. some European countries) used around the globe to all indicate the same same thing, my mind starts to lean towards this being the answer...
I'm curious to know the answer to this one.
Jason
RE: surface symbol?
Try http://www.vx.com/help/0725.htm and follow the link to surface texture symbols.
Jason
RE: surface symbol?
Its a JIS Standard, you may find out the "R" and triangular indication from the three pages attached.
Hope this help
SeasonLee
RE: surface symbol?
Why are you guys making this so difficult?
RE: surface symbol?
& there's the problem, we are supposed to make the part. One of our senior guys doesn't want to do machining saying that wvay symbol means as cast (naturally to save cost). The customer wants them machined & says "R"s are different from this wavy symbol (but can't say exactly what they are or which standard they belong to).
May be in the end we will machine them, afterall the customer is always right.
RE: surface symbol?
RE: surface symbol?
RE: surface symbol?
thread1103-276149: Compliance with ASME Y14
Frank
RE: surface symbol?
We have not determined whether or not it follows standards. We just do not know what the standard was.
I observe further more that the lettering is neat enough that the drafter used a drafting machine to position his template. The only exception is the one 10mm radius "R" which appears to be hand lettered.
I still think the two squiggly lines are nothing more than someone doodling on the original.