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June 2006

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Subject:
From:
John Burke <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, John Burke <[log in to unmask]>
Date:
Mon, 26 Jun 2006 10:53:41 -0700
Content-Type:
text/plain
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text/plain (148 lines)
It is a spring washer which has a particular shape. Imagine a washer that
has been "coined " to the shape of a much larger sphere. If you put the
washer down on a flat surface the rim will be in contact with the surface,
the edge by the hole will not. If you turn it up the other way, the edge
with the hole will be in contact the outer rim will not.

These washers act like a regular spring washer but are much better for this
type of application I have found particularly on systems where the current
drain and associated heat is liable to cause expansion and contraction of
the assembly.

John

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kerry McMullen
Sent: Monday, June 26, 2006 10:38 AM
To: [log in to unmask]
Subject: Re: [TN] Plating Recomendation?

What is a Bellville washer?
TIA

Kerry McMullen
Principal New Product Mfg. Engineer
LTX Corporation
50 Rosemont Road
Westwood, MA 02090-2306
(T) 781-467-5468



John Burke <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
06/26/2006 01:36 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
John Burke <[log in to unmask]>


To
[log in to unmask]
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Subject
Re: [TN] Plating Recomendation?






No comment about the finish, but you might recommend he use Bellville
washers on the bolt asseblies.

John

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Parsons
Sent: Monday, June 26, 2006 10:21 AM
To: [log in to unmask]
Subject: [TN] Plating Recomendation?

Happy Monday!



I have a customer (we are a fabricator) asking the following question;



"..we are looking at making a board that is intended to be bolted to some
batteries through 6mm and 8mm nuts and bolts. I was wondering if you have
any recommendations on what sort of plating should be on the pads these
nuts
are going to screw down onto? The batteries are fairly heavy and the
apparatus may be subject to some vibration and shock. Thanks for your
insight."



I am thinking HASL has been used for years in similar applications but
does
anyone have any experience or are there any studies on the matter?



Regards



John Parsons




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