A crafts forum. CraftBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » CraftBanter forum » Craft related newsgroups » Jewelry
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Estimating gold content of "probe pins"



 
 
Thread Tools Display Modes
  #1  
Old February 16th 13, 07:47 PM posted to rec.crafts.jewelry,rec.crafts.metalworking
Peter W. Rowe[_2_]
external usenet poster
 
Posts: 115
Default Estimating gold content of "probe pins"

On , in rec.crafts.jewelry Ignoramus21620
wrote:

At this point I am not sure what auction it is from, but I was digging
through my "get to one day pile" and accidentally found a couple of
lbs of gold plated industrial probe pins:

http://goo.gl/LN56t

I decided to estimate gold content.

I looked up online and found that the best gold plating is 50
microinches. So, I assumed that thickness, as these are very expensive
industrial pins.


The expense of industrial parts more often relates to precision. Gold plating
is seldom an ideal process, since points, edges, tend to get thicker plating,
and hollows get less, reducing the precision of parts. Gold plating will be put
on according to engineering needs, and thicker is normally needed only when
resistance to wear, or corrosion, is needed. I doubt either is the case here.
I'd assume here it would be like the gold plated connectors on circuit boards,
there to prevent minor corrosion/oxidation, and to enhance the electrical
conductivity. This normally doesn't need thick plating, but exact thicknesses
is something I cannot guess at.

50 microinches is appx. 0.001 millimeter.

I further assumed that the pins are 0.1mm thick wall (they are hollow
tubes inside, they are spring loaded).

So, on a 0.01mm material, there is two layers (inner and outer) of
0.001mm gold plating.


..01 mm is really really thin wall material. I'd bet your tubes are at least
slightly thicker, since they need to resist mechanical deformation. Remember
that these, for electrical conductivity, are likely to be non-ferrous metal, so
not as strong as some things might be. But again, I'm guessing. Also, I
seriously doubt that there is any gold on the interior of the tube. Getting it
there would pretty much require either a process other than electroplating, or
would need plating to be done before the stock was made into tube. Unlikely.
Getting gold to plate evenly into the interior of simple depressions is alreay
hard. Getting to the interior of something deep, like tube, pretty much
requires an anode in the plating process to be inside the tube. Unlikely. And
most likely, not needed. So assume plating only on exterior surfaces where you
can see it..


That is 0.002mm, or 2% by volume.

Since gold is 3x heavier than other metals commonly used for those
pins, like iron and nickel, then the gold content is 6% by weight.


I would expect either a copper or copper/nickel alloy...


For 2 lbs of pins, they could contain 1.92 oz of gold.

Am I way off here?

i


Could, of course, is an open term. Likely? I doubt it. Compare this to gold
plated costume jewelry. For several pounds of typical scrap electroplated
costume jewelry, one might expect refining returns on the order of a gram or
two per pound. But again, it varies widely.

May I suggest that you post this question a well, to the "Orchid" mail list
forum hosted on www.Ganoksin.com. That web site, set up as a service to jewelry
makers and metal arts workers, is one of the busiest discussion forums on the
subject on the net, and the mail list, by far the largest such forum, far busier
than this newsgroup ever was, even when it was active, which it now is not. The
Orchid list (which is not about flowers. It's about jewelry related topics.
It's named "Orchid" because it's owner is in Bangkok, where there are Orchid
flowers everywhere...) currently has something like 12 thousand active
subscribers. Post your question to that list, perhaps asking for off list
direct replies so you can find them without needing to read the list, and you
are guaranteed to have reached a fair number of professionals in precisely the
fields you need to reach for your answers, ie refiners and scrap metal dealers
who've dealt with various forms of industrial gold plated scrap metal before.

cheers

Peter Rowe
moderator
(still, though not every day anymore since now there's seldom any activity)
rec.crafts.jewelry newsgroup
Ads
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Wanted: "Parrot Roost" by Anita Barton, cover of "Needlepoint Plus" [email protected] Needlework 1 August 15th 12 09:58 PM
"Butterfly Dress" in "Beads Buttons and Lace/Romantic Style" both by Jennie Atkinson Roseagh Yarn 4 July 31st 07 10:00 AM
OT proposed discussion: How did you learn to be a "woman" ratherthan a "girl"? off kilter quilter Quilting 0 August 30th 06 02:33 AM
"Gold Rush lives on" [email protected] Jewelry 0 November 2nd 05 02:29 AM


All times are GMT +1. The time now is 10:29 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2004-2017 CraftBanter.
The comments are property of their posters.