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Pointing wire (ws Deplating)


#1

John said,

In my case, this process takes only about 10 seconds as I tend to
use a fairly high current,<<

What a great idea!

Sure beats trying to file then end pointy.

Does your power supply have an ampmeter, what’s your definiton
of ‘fairly high current’?

Thanks

Dave


#2

On 13-Jan-97, David D. Arens wrote aboutRe:Pointing wire (ws Deplating):
John said,
In my case, this process takes only about 10 seconds as I tend to
use a fairly high current,

DDA> Sure beats trying to file the end pointy.
DDA> Does your power supply have an ampmeter, what’s your definition
DDA> of ‘fairly high current’?
DDA> Dave

G’day: My power supply - battery charger - does have an ammeter,
and when I do the electrochemical pointy thing, it goes pretty
well hard over at 5 amps. Doesn’t hurt it just for a few
seconds. I set the output to ‘12V’ and control the current by
the depth of the stainless electrode (NEGATIVE) in the solution
and it’s distance from the wire to be pointed. The closer the
electrodes, the higher the current. (i=e/r where i=current
in amperes, e= e.m.f in volts, and r = resistance of the system
in ohms. All frightfully high-tech, eh? ;-D ) So long as there
is no direct connection to your AC mains; that is, if the power
supply has a proper transformer between input and output, 12v
isn’t shockingly lethal. However, some of the modern El Cheepo
brands might have what is called an auto-transformer, (nothing
to do with cars, really) and these are to be avoided like a
plague. If you don’t have a continuity meter, talk to an
electrician, who can check to see if there’s any connection
between the input AC mains plug and the DC output terminals. And
that goes for any battery charger. If there is - get your
money back quickly!

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