how to correctly call out stud/insert type features

[600rob]

Is there a correct way of calling out studs or inserts such as press in threaded inserts on an engineering drawing.

At my current company they use all types of panel inserts such as press in threaded bushes, clinch studs etc.

Our drawings call these up with something along the lines of ‘’M4X10 clinch stud typ4 places’’ however i have always wondered what is the correct way of identifying and conveying this type of feature in a drawing.

You can see a typical example of what i mean on the attached drawing.


Thanks

 

[MikeHalloran]

I would typically call out the stud mfgr name and part number also, if generic approximate matches are not acceptable. ... and they're usually not.

There's another issue or two.

The hole prep for press-in studs is not generic or simple, typically requiring drilling and reaming, sometimes spotfacing, and _not_ deburring, and may be different for different stud vendors.

I have had buyers send parts like yours to different vendors for blanking, folding and pressing in the inserts. Bad assemblies and finger pointing are a common result.

There needs to be a mechanism for informing the vendor exactly what hole prep is required. Forcing him to look it up may not be the best way. Forcing your buyer to send out cut sheets with orders may work. Company standards may work. Putting the hole details on the print is most likely to work.



Mike Halloran
Pembroke Pines, FL, USA

 

[600rob]

Hi mike, We create all products in house hence all of the studs and press in bushes are stock items.

We punch/cut all shhet material in house hence all holes are prepared for what ever insert will be used on them.

We dont really have a compant standard but since everything is done in house we dont have a ny problems doing this type of thing

I was just wondering if there was a recongnised industry standard or approved way of specifiying the application on the actual inserts

 

[MikeHalloran]

A good place to start is with the stud vendor catalog.

Do people on the shop floor have access to the recommended hole prep and installation instructions, or are they just winging it?

Have you ever tested an installed stud for pushout/pullout force?
How did your test results compare with what the vendor claims?

I'm guessing that you didn't start investigating this issue just for fun, i.e., you're having a problem downstream. Can you reveal what piqued your interest?


Mike Halloran
Pembroke Pines, FL, USA