Brad,
Belleville washers are also know as conical spring washers. McMaster Carr
has them. They are used to maintain preload on a joint that might be
subject to movement beyond the stretch of the stud. For this application,
you might want to stack them in series to make them stiffer.

Jerry Stephenson
949-368-6702



Sent by: cc:
ore.net


09/30/01 10:12
AM
Please respond
to mapug






Brad

Thanks for the info i shall have a search for these washers they are bound
to becall somthing else here in the UK

Thanks again for the pointer

Tony Floyde

----Original Message-----
Subj: Re: [M]: Opinions on pier design
Sent: 28 September 2001 18:55

Hello - -

I've been following some of the ongoing thread on pier design, and in
particular the offshoot on bolting an adapter plate to the top of a
pier. McMaster-Carr and others sell a great device made just for this
type application called a Belleville washer. A Belleville washer, also
called a disc spring, is a concave shaped steel washer designed to be
placed into compression without permanent deformation. McMaster-Carr
shows them in sizes from 0.093 to 2.00 ID. To look at their selection
and how they're used, go to the Raw Materials and Springs section on
McMaster-Carr's main page (http://www.mcmaster.com) and select the very
last item, which is Springs. Select Disc Springs when the Springs page
comes up.

Belleville washers are ideal for stud mounting an item that must be
aligned rather than just bolted down. To give you an example of where
I've used them, I used to work on an RF anechoic chamber with a feed
antenna system in one end that had to be precision aligned. The
antenna assembly was mounted to a flat plate, which was in turn mounted
to the top of a very rigid frame. Threaded 3/4" studs protruded out of
the top of the frame, and on each stud was a stack of six or eight
Belleville washers, with the dish on each washer alternating from that
on the adjacent washer. These washers allowed the antenna plate to be
leveled extremely accurately, by torquing down the corners as required.


Just as an approximate cost, McMaster-Carr sells 1/2" Belleville
washers in a package of 12 for $10.50, which isn't bad. Of course I
don't know what their minimum purchase is either. You also might be
able to buy them locally from an industrial machine shop or other
industrial hardware supplier.

Hope that helps.

Clear skies y'all!!

Brad Bradfield

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