TYPICAL or TYP notation on drawings
TYPICAL or TYP notation on drawings
(OP)
Anyone know the exact definition for the notation: TYPICAL or TYP? I have some old drawing that use them. I'm not sure where or when to use them, or if it is even a standard. Any info is appreciated.





RE: TYPICAL or TYP notation on drawings
I have seen ".25 dia holes, TYP". What does that mean?
I don't use it.
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
1. in lieu of counting and giving the discrete number of instances.
for example if you have a sheet metal part where all the break radi is .5 in, you would leader one radius and annotate ".50 TYP".
or
2. If you have a detail that occurs in 6 places on the drawing, you can add to the detail title "TYP 6 PL" meaning that all six places are the same.
Bacically you are saying all the things that look like "THIS" mean "THIS"
Wes C.
------------------------------
When they broke open molecules, they found they were only stuffed with atoms. But when they broke open atoms, they found them stuffed with explosions...
RE: TYPICAL or TYP notation on drawings
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RE: TYPICAL or TYP notation on drawings
ASME Y14.5M-1994
1.9.5
1.9.5.1
1.9.5.2
1.9.6
"Art without engineering is dreaming; Engineering without art is calculating."
Steven K. Roberts, Technomad
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RE: TYPICAL or TYP notation on drawings
Wes C.
------------------------------
When they broke open molecules, they found they were only stuffed with atoms. But when they broke open atoms, they found them stuffed with explosions...
RE: TYPICAL or TYP notation on drawings
I used to use it a lot back in the UK, especially on things like chamfers and rads.
RE: TYPICAL or TYP notation on drawings
I knew it wasn't standard, but wasn't sure where exactly in the spec. It was OK in 1982 std.
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
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RE: TYPICAL or TYP notation on drawings
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
"Art without engineering is dreaming; Engineering without art is calculating."
Steven K. Roberts, Technomad
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?
RE: TYPICAL or TYP notation on drawings
Regards,
Namdac
RE: TYPICAL or TYP notation on drawings
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
I agree!
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
Regards,
namdac
RE: TYPICAL or TYP notation on drawings
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
Using TYP, you are ASSUMING that the fabricator will be able to tell the difference between similar sized holes and won't put in too many or too few, for example.
While some things have eased up per the standards, that doesn't mean that they constitute good practice.
RE: TYPICAL or TYP notation on drawings
Regards,
Namdac
RE: TYPICAL or TYP notation on drawings
If you have a plate with 10 holes. Five of the hole are the same, the other five are the same. One callout indicates DIA .25 TYP, the other DIA .375 TYP. Which holes are which?
I have seen this type of drawing a lot.
The correct way would be to use a hole table.
I have also seen a part that had one hole drilled, with a callout DIA .375 THRU, TYP. The machinist wanted to know where are the other holes?
Although the new spec says it's OK to use TYP, and is widely use, I never use it for clarity.
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
Wes C.
------------------------------
Light travels faster than sound. That's why some people appear bright until you hear them speak.
they found them stuffed with explosions...
[/i]
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
namdac,
Do your drawings state ASME Y14.5 as the standard for interpretation. If not, and the drawing is civil, or architectural, or other, typ could be used and left to the interpretation of the users.
RE: TYPICAL or TYP notation on drawings
Repetitive features or dimensions MAY be specified by the use of X in conjunture with a numeral to indicate the "number of places" required. (Emphasis mine)
Again, this does not make the use of "TYP" a best method to dimension.
RE: TYPICAL or TYP notation on drawings
I don't believe that 'X 7' hardly equates to 'TYP'.
But if you are not applying 14.5, GO FOR IT.
RE: TYPICAL or TYP notation on drawings
It would be 7X.
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
If I am doing several changes on an old drawing that has TYP, I will request to change it from TYP. I have seen different part batches be a little different from the old drawing because of TYP from different vendors. Make it clear and don't use TYP to describe qty of features or parts.
The only time I would use it would be for example, if I'm making a custom thread and call out a thread angle. The angle would be TYP because qty of threads could vary.
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
So, 99.9% of the time I do not use TYP.
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
"This standard establishes uniform practices for stating and interpreting dimensioning, tolerance, and related requirements for use on engineering drawings and in related documents..."
To me this means that if it's not in the book and you conform to the standard, then don't do it.
Section 1.9.6 indicates that an X may be used to indicate multiple locations but there is no mention of the TYP callout.
I feel very strongly that the "TYP" callout provides room for error and misinterpretation. Why would anyone use it when it is much clearer and accurate to state a multiple place dimension as 2 X or 10 X or what ever?
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
I did just think of a way that I would be cofortable using "TYP". A detail veiw of an arrayed set of features, I MIGHT use "TYP" next to the detail name, but most likely I would just put a quantity number.
If it can be misunderstood, don't do it.
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
Very common saying. A lot of campanies live by it.
I witnessed once an engineer getting fired for saying it.
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
My argument is, if everyone followed the same standards, we wouldn't be having these discussions.
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
If you don't have the time to verify the specific number of times the feature is required, how or why should anyone else subsequently involved with the manufacture or inspection be expected to verify the same information.
RE: TYPICAL or TYP notation on drawings
Otherwise you need to verify it manually so it's a good cross check.
That said I used to say TYP but now no longer do.
RE: TYPICAL or TYP notation on drawings
KENAT, Depends on the scenario.
The general thing is that TYP is understood by those who use it (creator and fabricator), whether it is specifically listed in a particular standard or not. Misusing it would create confusion, but misusing any annotation does that. The whole discussion on this is just academic.
RE: TYPICAL or TYP notation on drawings
I'd debate about it being academic, the first post was asking what TYP meant so obviously it's not universaly understood.
If something is defined in a standard and you reference that standard most confusion should be removed.
RE: TYPICAL or TYP notation on drawings
When i went to school the use of 'TYP.' was the standard and it was taught. My problem with the so called 'standards' is that if its all kept a secret unless you spend $1000, then it isnt really a universal standard. Its a standard only to those who subscribe to it.
Of the 6 companies I've worked for, only 1 has purchased the standards. And they dont update it, cause that costs more money. So if a standard changes, it goes unknown.
If standards are truely meant to be used by the masses as a universaly accepted standard, they need to be made available to the masses. The cost of publication and running the burocracy behind it should come from other sources.
Just my $.02
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Randy
RE: TYPICAL or TYP notation on drawings
Namdac
RE: TYPICAL or TYP notation on drawings
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
Your sir are a pip. Funny too.
Namdac
RE: TYPICAL or TYP notation on drawings
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
RE: TYPICAL or TYP notation on drawings
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
.125 TYP TYP
It's this kind of mixed/different use that makes you wish there were standards for this kind of thing
RE: TYPICAL or TYP notation on drawings
If I wanted a dim of .125, approximately, I would show a loose tolerance. I always show a tolerance on all dim's. This way there is never a question and everyone knows the range the dim should fall in.
Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)
RE: TYPICAL or TYP notation on drawings
Hence my callout was saying.
.125 Approximately, in a number of locations.
I wouldn't use it that way I'm just saying that's where you could end up.
RE: TYPICAL or TYP notation on drawings
Your use of TYP actually falls under REF, generally denoted by parenthesis these days. Never heard of anyone using TYP in the way you mentioned, nor would that be clear to anyone who reads your drawing.