[AT] Points

[Stephen Offiler]

Hi Ron:

Check out some discussion of platinum-iridium vs. tungsten, see page 8 of
this PDF:

http://www204.pair.com/bbg46/FM%20Mag%20Manual/Mag%20Early%20Ign%20Systems(23-31).pdf

And this:

http://goldrefiningforum.com/~goldrefi/phpBB3/viewtopic.php?t=1711


SO





On Thu, Mar 9, 2017 at 12:49 PM, Ron Cook <ron at lakeport-1.com> wrote:

> Steve,
>
> I can certainly buy the use of tungsten, but not the reason.  The
> hammering would seem to me to be the same in either application. I
> rather suspect tungsten is much cheaper than platinum and iridium.  I am
> not educated in these electrical things, but I can certainly follow the
> dollar.  My old platinum points just seem to last forever whereas modern
> point sets do not.
>
> Ron
>
>
>
> On 3/9/2017 9:46 AM, Stephen Offiler wrote:
> > Hi Ron:
> >
> > I should have stated that I was conjecturing about the cadmium
> > construction.  Back about 20 years ago I was employed by a manufacturer
> of
> > circuit breakers and the contact material of choice, by a wide margin,
> was
> > the silver-cadmium I described.  I had stuck in my memory that this was
> > also used on breaker points.  Not necessarily accurate!!
> >
> > I just took a real quick look and it seems platinum was actually alloyed
> > with iridium to make it harder, and that was used in magneto points.
> > However, battery and coil ignitions, according to the big wide Internet,
> > used tungsten to better withstand the hammering they go thru.
> >
> > SO
> >
> >
> >
>
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