TYPICAL or TYP notation on drawings 4

[josewong]

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.

 

[ctopher]

Not standard, but are typically used.
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)

 

[wes616]

As far as a textbook definition goes, I probablly could not give it to you, but the use of TYP is pretty simple. If something is Typical, say so...

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...

 

[Heckler]

TYPICAL or TYP indicates the number of places the geometry feature or dimension appears on a drawing It could be in ANSI/ASME Y1.1-1989 Abbreviations for Use on Drawings and in Text.

Best Regards,

Heckler
Sr. Mechanical Engineer
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[MadMango]

According to the latest standard, TYP is no longer used.

ASME Y14.5M-1994
1.9.5
1.9.5.1
1.9.5.2
1.9.6

[green]"Art without engineering is dreaming; Engineering without art is calculating."[/green]
Steven K. Roberts, Technomad
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[wes616]

Mango, really? Guess that's why I couldn't find it... Well thank goodness for company standards... (i guess)

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...

 

[KENAT]

Sadly Mad Mango is correct. I got this pointed out to me by my checker a while back.

I used to use it a lot back in the UK, especially on things like chamfers and rads.

 

[ctopher]

Thanks MM.
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)

 

[josewong]

Thanks guys for the quick reply and info. MM thanks for pointing it out that it is no longer a standard. I will do a lil more digging to see it this applies to us anymore.

 

[ctopher]

If your company is typ, it will.


Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)

 

[looslib]

Actually, the 1982 spec says the same as the 1994 one.


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Ben Loosli
Sr IS Technologist
L-3 Communications

 

[ctopher]

Thanks Ben. Maybe it was the one before 1982, don't remember. But, it was OK at a time.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)

 

[MadMango]

It's a hard habit to break to be sure.

[green]"Art without engineering is dreaming; Engineering without art is calculating."[/green]
Steven K. Roberts, Technomad
Have you read faq731-376 to make the best use of Eng-Tips Forums?

 

[namdac]

Way back in the olden days of yesteryear before computers typ was a callout used for items of symmetry. You can still use it today. I currently use it for descriptions on land surveys.
Regards,
Namdac

 

[ctopher]

If you use TYP on a mechanical drawing for symmetry today, it would not be clear what is needed.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)

 

[ewh]

ANSI Y14.5 used to dictate the use of X instead of TYP, but ASME Y14.5-1994 now states that X "may" be used, which seems like TYP is allowed once more. It is still poor practice in my opinion, as specifying the number of places removes ambiguity. As for symmetrical parts, any qty question is answered by the symmetry mark on the centerline.

 

[ctopher]

ewh,
I agree!

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)

 

[namdac]

If the machinist can not understand what the drawing says they obvously flunked the blue print reading course. I think my thirty years between civil,mech,elec, and aero I have never had anyone come up to me and tell me that they don't understand.
Regards,
namdac

 

[ctopher]

I haven't either. But, I have received a lot of parts machined wrong and not per print.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)

 

[ewh]

I have a hard time forgetting level 3 drawing training. The purpose of a level 3 drawing is so that there are no questions or ambiguities of how to make a part based on the drawing, anywhere in the world (provided they know how to follow the standard). All of the i's have to be dotted and the t's crossed, so to speak. There can be only one way to interpret the drawing and assumptions are not allowed.
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.