If a Blueprint calls for ASME Y14.5 wouldn't this be the standard rules apply. How would I know if and when to apply ISO? I have yet to see anything on a blueprint stating this. The reason I bring this up is for the good old Profile callout. Before I make an argument, I want to cover all my resources. Customer already claims in an email that PC-DMIS is not capable of doing this. I and everyone on here already that's horse_S_H_I_T. But its Friday and I'm ready to P_I_S_S someone off
I just browsed thru the whole thread, and I still don't quiet understand is there an actual definition of how the profile is measured based on the y14.5-2009 or 1994???
is it double the worst reading or just the upper and lower combined?
I just browsed thru the whole thread, and I still don't quiet understand is there an actual definition of how the profile is measured based on the y14.5-2009 or 1994???
is it double the worst reading or just the upper and lower combined?
Post #20 One actual hit in the positive and one actual in the negative. You cannot take one of those values and multiply it. That's what that says in the book. So you have one of 2 options add them together, or report highest reading and lowest reading
sorry Wolfman, there is no official resolution. Some of us are positive its one way or the other. Kirb is sure he understands it correctly, but the authorities who train people in my area (Minnesota) insist on doubling the worst reading. It might be a sort of regional understanding. Maybe you can find out how the people in your region understand it and go with that. I still think what Don Day teaches in his youtube video makes good sense.
The standard explicitly states that no single value is sufficient. Reporting max and min are the only safe bet (when dealing with people who understand GD&T. For anyone who doesn't, it doesn't really matter what you do, as long as OOT is red and in tolerance is not.)
Funny you mention Don Day, I contacted him personally, He responded he will talk to his superiors, and get back to me. Still waiting, guess he is not sure he understands it either. It's not just what I think is correct. I have been to several classes, in 88 I took the ANSI 82 standard class, was taught this, 97, ASME 94, and as of recently ASME 2009. All with the same conclusion, all different instructors. Now, I never seen this Book that I shared with everyone until I actually bought it. But with the rules the way they are for now. You cannot multiply 2. Do like Vinni says 2 readings positive and negative. At least that is clear, according to the standard.
Kevo, there are two different snippets, one from y14.5-1994 and the other one is from 14.5m1-1994, I know because I have both. If the print is called out for Y14.5-1994, can you really go by the Y14.5M1-1994.
Vinni, You said that that standard explicitly states that no single value is sufficient. Reporting max and min are the only safe method, What do you do when you actually need to report an ACTUAL Profile??? So you have multiple points on the surface with MIN and MAX value, which is great. you know the part is in SPEC, which is great, but you still need to be able to REPORT the actual Profile reading.
The actual profile reading is the Max and Min. Whatever the tolerance zone is. The only question is "do the max and min fall within the tolerance zone?"
2x max could only apply to bilateral equally distributed profiles (hypothetically, if it were the ASME way).
I agree Reporting Min and Max would be helpfully descriptive. In fact you could report a bunch of different point locations to more fully describe the lay of the surface. But if the question is, what number do you report so that you can say if its in tolerance or not, we discussed that to a draw further up this thread and I dont really care to reopen that discussion. We have to agree to disagree and resist the temptation to consider the other deficient in intelligence because they wont agree with us.
