Subject: Re: Reducing contact resistance for low volt use?
Summary: What do you think of these ping times eh?
Reply-To: You can't see me, and I pass right through planets...
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Date: Tue, 07 Jan 2003 09:38:29 GMT
NNTP-Posting-Date: Tue, 07 Jan 2003 04:38:29 EST
On Tue, 07 Jan 2003 01:40:08 GMT, jmuchow@SPAMMENOTcamlight.com (John
Muchow) Gave us:
>>>> For silver plated wire I do not have a link, but I know it to be
>>>>lower for any given gauge. From what I could tell, that is what you
>Absolutely. But, I'm quite interested in seeing if the difference is
>any more than a tiny fraction of a percent. We're using very short
>copper bars between the batteries and I'm not convinced that the extra
>cost provides any practical benefit....even if the silver-plated wire
>a lower resistance.
>If I get .005-ohm resistance with all-copper and .00495-ohms with
>silver-plated copper, then yes, I do have lower resistance.
Well, I would ask how you measure the bars, both the device, and the
>it won't offer any benefit worth the price of the teflon-insulated
>(silver-plated copper) cable.
Actually, you can buy it in coaxial form. They are used as ground
shielded power lines where the ground shields are used as shields over
each line, not to pass power. Even the ground has its own run.
But no, I meant SPC teflon or otherwise. An example would be 14
gauge at 38 cents a foot. It takes 8 pieces to make a #2 cable from
it. Even ten pieces would be a fairly cheap "bar" of SPC. Hell,
strip them, and group them, and solder them all together with silver
solder, and actually form bars from them.
$3.80 for a one foot segment of BETTER than #2 SPC.
> And stripping teflon-insulated cable
>isn't much fun either (most of us don't have high-temp wire strippers
>and we'll never use mechanical ones).
That's baloney. The precision of even the simple brand of shear
type stripper is quite high enough for mil spec strips with zero
nicks, when properly performed. Care must be taken, that's all. You
only use the striper die to make the cut. You then must remove the
stripper, and grab the strip cut portion on the insulation, not drag
the stripper across the wire. Pretty simple, when done correctly, and
those laser honed babies sure are. We haven't used hot strippers in
Anyway, I'd buy the cheaper, smaller stuff, cut many pieces, form
them, group them, and make voltage rail bars from them, your self,
with all soft, non destructive bending.
As for large diameter stuff, you should know by now how to strip the
big stuff, nick free. Teflon or otherwise. :-]
>The teflon insulation does offer much higher temperature ratings
>though...a real plus in a combat robot.
Strangely, however, UL gives their SUPERIOR breakdown strength only
a 600 volt rating, while the mil boys call it out as 1000 volt wire.
UL does not know much about HV. Well... now they do. :-]
They just could not grasp the fact that the ANODE lead on ANY
Monitor supply will NOT pass medical specs for current. Particularly
the 18kV variety.
That is why the anode connector is so... insulative. We do things
for a reason. :-]
We could not use it (teflon wire) in one application that involved
them (UL), and a focus output return wire on a fully floating medical
system that was over their 600 volt rating, despite the fact that
lawrence livermore was just fine with it at the mil rating of 1000
volts. Go figure.