> -----Original Message-----
> From: Jon Elson [mailto:el...@pico-systems.com]
> Sent: April-06-20 1:24 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Gecko Failure
>
> On 04/06/2020 11:43 AM, Peter C. Wallace wrote:
> >
> >
> > The general problem with Tin connectors is that they have
> > a positive feedback failure mechanism if used anywhere
> > near their current limits, their contact resistance rises
> > over time and heat exposure and the higher the resistance,
> > the high the temperature and the faster this degradation
> > progresses...
> >
> Even worse is intermittent usage in a humid environment.
> The tin oxidizes, grows whiskers and
> just generally degrades in humid conditions. Then, when you
> try to pull a lot of current, you
> get a high resistance contact.
My guess is that's what happened and it resulted in current flow between the
pins of the windings. And then it fed on itself.
What's frustrating this winter is that a year ago January I had the perimeter
drain pipe around the house replace and added around the garage section. This
hear no rivers running through after massive rain storms. I have a Raspberry
PiZeroW reporting this:
T=15.6C,RH=55.0%,DP=6.6C
And yet I've had more surface rust on everything this year than over the last
10. Go figure. There shouldn't be any moisture condensing on anything with a
dew point at 6.6C. And yet...
John
>
> Jon
>
>
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