[AT] Points

[charlie hill]

I'll have to find an old set laying around here somewhere and see what it 
looks like.
The main problem for me is they are tiny and easily bent and I don't do that 
well.
I'm better suited for 4 pound hammer work.

Charlie

-----Original Message----- 
From: Bill Brueck
Sent: Tuesday, March 14, 2017 2:39 PM
To: 'Antique tractor email discussion group'
Subject: Re: [AT] Points

I bought an eBay new voltage regulator a couple of years ago, common Delco 6
volt application on a Farmall Cub.  Worked intermittently, took the cover
off and was surprised to find it construction with mechanical points, coils,
just looked like a regulator from the vintage.  The points were just riveted
to the metal that held them in place.  This I know because that was the
problem when I traced the failure: one of the contacts wasn't making solid
connection to its mount.  A little disassembly to get the point out where I
could work on it, a little peening, and the regulator was good.

SO contact points with a stub on the base to rivet-attach them to something
are available somewhere...

Hmmm, google rivet electrical contacts...they're all over the place.

Bill Brueck
Pine Island, MN  USA

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of charlie hill
Sent: Tuesday, March 14, 2017 11:30 AM
To: Antique tractor email discussion group <at at lists.antique-tractor.com>
Subject: Re: [AT] Points

I'm wondering just how they attach the material to the points mechanism?
Seems to me it would be fairly easy to "rebuild"
a set of points if you had a reliable way to attach them.
None of the points I've been able to buy in the last 20 years are worth much
but there are lots of industrial uses for breaker points so the reliable
materials should be available somewhere.

Charlie

-----Original Message-----
From: Stephen Offiler
Sent: Thursday, March 09, 2017 10:46 AM
To: Antique tractor email discussion group
Subject: Re: [AT] Points

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



On Thu, Mar 9, 2017 at 9:58 AM, Ron Cook <ron at lakeport-1.com> wrote:

> The old points and aircraft magneto points are platinum.  If not burnt
> and thereby pitted, will give no problems.  My opinion, of course.
> They are very hard and require the points(used to be called
> platinum)file to resurface.  My aircraft stored in the exact same
> place as the tractors and some old engines that never have a problem
> is my experience.  I also have never heard of Ivan's very interesting
> emergency system.  I will also state that I have the points corrosion
> problem regardless of 6 or
> 12 volt.
>
> Ron Cook,
>
> Salix, IA
>
>
> On 3/9/2017 6:34 AM, Stephen Offiler wrote:
> > Ivan's "emergency" ignition system is pretty interesting; never
> > heard of that before.
> >
> > John, I do own a points file but I'd have to go digging to find it.
> > I
> use
> > a piece of "wet-or-dry" sandpaper (dry of course) with a grit
> > somewhere either 400 or 600.  I'm reluctant to take off too much
> > material.  Points contacts used to be made of a multi-layer material
> > with copper core (heat
> > transfer) then some silver-cadmium alloy in a measureable thickness,
> > not just a plating.  That stuff has some magic metallurgical
> > property that resists corrosion, resists micro-welding if there's
> > any arcing, and
> resists
> > or prolongs that inevitable material transfer (those hills and
> > valleys,
> the
> > reason you eventually need to file them)
> >
> > Now I just said "used to be made of" because I strongly suspect the
> cadmium
> > has been removed and along with it goes some or all of the magical
> > properties.  So they're more prone to all the bad stuff mentioned
> above.  I
> > think my points must be new enough to be made of the inferior materials.
> > But they have very low hours and show no signs of wear and pitting.
> >
> > I was curious to see if others have similar trouble, and if there
> > are clever solutions.  I realize I really should lean towards that
> > Pertronix electronic ignition retrofit.
> >
> > SO
> >
> >
> >
>
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>
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