surface symbol?

[emonje]

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.

 

[emonje]

So the JIS says wavy symbol is for as cast surface. But the company that the drawing came from had used the old part and they are sure about necessity of machining on the particular surfaces.
& 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.

 

[Medeski]

If it may possibly be of a Japanese standard, I believe it is the old way of calling out a "smooth material" finish. According to our technical standard, it's not used anymore. I think that this is was do to a revision of JIS B 0031 standard. Many of the older drawings at our company have that symbol on them, as well as upside down triangle symbols (?), though those aren't used anymore either.

 

[cloa]

Do you know anything about the maker of the drawing? e.g. his nationality

 

[fsincox]

I find it ironic this thread should appear next to a thread basically asking: "should we follow the standards".
thread1103-276149
Frank

 

[drawoh]

fsincox,

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.

JHG