[AT] Points

[Dave]

I thought silver solder was the usual way.
	Dave

> On Mar 14, 2017, at 2:39 PM, Bill Brueck <b2 at chooka.net> wrote:
> 
> 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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