Re: Question on connector used on servos

Strangely enough gold is not always best. Gold is best for contacts
that carry 1mA or less. Because gold does not corrode or tarnish, it
will not develop an oxide layer to interfere with conduction for very
low energy contacts.

The situation changes drastically at higher currents. Above 10mA, a
closing contact has enough energy to develop an arc. This arc, no
matter how small, welds the contacts at a microscopic level and
insures a gas-tight connection.

Meanwhile, the same happening with a gold contact vaporizes the 5-
micron gold layer leaving the just the nickel underplating. This does
not form as good of a contact as a welded tinplate one.

"Best" depends on the current level contacts carry. Very low
currents, go gold. Higher currents, go tin plating or other.

Mariss


--- In CAD_CAM_EDM_DRO@yahoogroups.com, John Johnson <johnatl@m...>
wrote:

> Gold is definitely better. Sure, it costs more, but when taken in

the

> context of the big picture, the difference is negligible. Consider

if a

> tin connector fails, or worse, is intermittent. What are the costs

in

> downtime, aggravation, shipping for new parts, etc.
>
> Go for the gold.
>
> Regards,
> JJ
>
> On Monday, Apr 5, 2004, at 22:30 US/Eastern, Michael Gamber wrote:
>
> >
> > I am getting ready to wire up my servos. They are DC Brush type.

The

> > brushes have .187 quick connects. OK to use or is soldering
> > necessary?
> >
> > Also the encoder has .100 spacing pins that appear to be gold
> > plated. Do you recommend getting gold plated connectors to mate

with

> > them? I know that encoder wiring should be as fail-safe as

possible,

> > but will gold plating buy me anything here?
> >
> >
> >
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