ASME Rivet Callout?

[aardvarkdw]

Is there an ASME Standard for calling out rivets on a drawing? I have no experiance with rivets, our company almost never uses them but we found an instance where it is easier and cheaper than spot welding and now I need to figure out how to spec them for our vendors.

Thanks for the help.

David

 

[KENAT]

Don't know about ASME but if I recall correctly, back in the UK the relevant rivet standard usually detailed how they should be called out on the drawing. Pretty much all rivets we used to use were to a British Standard (or other national standard) spec.

What specifically are you asking about?

Are your asking if any notes are needed in the assembly drawing in addition to the rivets being in the parts list/ballooned or are you asking about the rivet holes etc?

 

[aardvarkdw]

I have a sheetmetal part on which we used to spec spot welds, I need to change the callout to rivets. I don't care what the manufacturer of the rivets is or even how they are installed. I just need to tell our fabricator to install flush rivets into a part and I was wondering if there was an accepted method of calling this out on the drawing. We call out ASME Y14.5M-1994 on our drawings so I was hoping there was an ASME approved way of indicating rivets.

David

 

[GDTGUY]

The only standardized method In know of for indicating rivets on and engineering drawing is NAS523, 'Fastener Codes'. This National Aerospace Standard defines a system of using coded symbols on the drawing to indicate fastener type, size,grip length, head location, etc.

GDT_GUY

 

[KENAT]

So unless I'm missing something.

The piece parts need to have the correct size holes in them.

On the assembly I'd just show the rivets on the drawing, balloon and add to the parts list.

In the parts list I'd put the standard the rivets are to (I'd guess MS or AN) or, if not to a standard, then an adequate description of the rivet.

However, if you can get a look at the standard GDTGUY gives that would be best.

Ken

 

[prohammy]

Take a look at this

http://www.mlevel3.com/BCIT/rivetID.htm

Kevin Hammond

Mechanical Design Engineer
Derbyshire, UK

 

[ewh]

Depending on where you are located, check out GDTGUYs suggestion. It is widely used here in the states.

 

[aardvarkdw]

Okay, sounds like NAS523 is the way to go. Does anyone have a copy of this they can send me? I can get alot of information from the site Kevin recommended but it doesn't tell me everything.

David

 

[49again]

'Course, you also need some sort of a rivet installation callout, like "Install fasteners per MIL-STD-403."

Steve R.

 

[KENAT]

Interesting, I've never seen the information on how to install the rivet, or what standard to install it to, placed on the drawing but then the drawings I worked were for places that had workshop practices etc which covered this.

 

[aardvarkdw]

Kenat,

How did you tell the shop that "a rivet goes here". That is really all I want. The shop is already putting the rivets in and I don't really care what they are as long as they are flush on one side.

David

 

[prohammy]

In a previous place I worked, they used a hole table to specify wwhich holes were rivetted and which were bolted.

Kevin Hammond

Mechanical Design Engineer
Derbyshire, UK

 

[aardvarkdw]

Kevin,

But what verbage was used to say I want a rivet?


David

 

[ewh]

Do you have a BOM? You could call out the item number with a note stating "INSTALL FLUSH ON NEAR SIDE" (or FARSIDE, whichever you need).

 

[prohammy]

Different letters for each variable that was in the part and then in the hole table

A Rivet (P/N xxx) Flush to this face
B Rivet (P/N xxx) Flush to opposite face
C Screw + washer + spring washer + nut

Kevin Hammond

Mechanical Design Engineer
Derbyshire, UK

 

[prohammy]

One other thing to say... the shop floor was only 2 minutes from Engineering, very easy for the assembly crew to check with Engineering



Kevin Hammond

Mechanical Design Engineer
Derbyshire, UK

 

[aardvarkdw]

ewh,

Unfortunately no, our sheetmetal parts don't get BOMs, for PEM fasteners and in this case rivets we just spec the part on the drawing.

David

 

[KENAT]

Well, since moving the states I've seen some interesting ways of doing things but I think most of that is the company I'm in, not necessarily a US/UK divide.

Back in the UK the rivets were shown on the assembly drawing, same way you’d show screws or bolts. Given that many of the drawings I worked were old, pre-CAD, they were basically just circles. For CAD we sometimes had models that were just the head of the rivet with perhaps a very short shank.

There was a balloon to them with a number corresponding to the entry in the parts list.

That was typically pretty much all.

In the event you had a view that showed the deformed head of the rivet you’d just put something that looked pictorially correct, no great effort to accurately show the level of deformation etc.

The actual holes were as far as I can remember always detailed on the piece parts. This was even true for drill to match patterns although these were old drawings to BS standards and I’m not sure this would fit the current US standards. If I remember they’d have some theoretical location of the rivet holes given that corresponded to the position on the mating part. Reference would be made to the other part, something like “10 holes dia .125/127 to match holes in part XXX-YYY”.

This is from memory though so take it with a pinch of salt.

 

[wes616]

Is there a reason why you would not consider a rivit as you would any other fastener. Other than the NAS523 standard (which is less and less common to use), you should locate them and call them out just as you would any other fastner pattern.

Wes C.
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[Heckler]

Just callout the rivet part number....either commerical or Mil. Things to keep in mind: Rivit Material, mandrel material, head type, grip length & the quality of the rivet (Cherry, MS, NAS)

Heckler
Sr. Mechanical Engineer
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