On Thursday 23 August 2007, Jim Register wrote:
>Jon Elson wrote:
>> Gene Heskett wrote:
>>> On Tuesday 21 August 2007, Jon Elson wrote:
>>
>> I think with a hollow electrode with a drip feed
>>
>>>> scheme through the electrode it would go a lot faster.
>>>
>>> Theres always that 'yabut' Jon, in this case yabut where can I find one
>>> of those? :)
>
>How about a syringe and needle? Back the plunger out, poke a hole in
>the side of the syringe, then slide that into a small "T" with o-rings
>top and bottom for a rotary coupling. The syringe body would make an
>insulated holder. You might have to go to a vet to get a needle long
>enough.
>
I considered a similar idea, but by the time I would have rounded up the stuff
and built it, I figured I could have it burnt out. I did trade the 3/32
brazing rod in on a 3/32 brass tube at the end, and had quite a fight with a
section of the tap that I couldn't get to blow out of the hole, but it would
fall over against the outside of the rod or tubing and short me down to 2 or
3 volts, and I'd have to pull it back up 300 thou to clear. I finally gave
up and pulled it up about 275 thou & let it cook at 2 to 5 volts for about 10
minutes, at which time it must have finally cleared the tip and I was able to
go back down at 10 thou a minute till it hit bottom again. Pulled it out,
cleaned it up and refilled the kerosene, and 3 more times of that got me far
enough a new tap could make 1/2" of good threads. Dinged the tap a bit
though on the old pieces, so I had to re-sharpened it, then used it to tap
the last 14 holes, that el-cheapo Mibro tap was still cutting better than a
new Hanson at the end. I think I'm gonna quit badmouthing Mibro... :)
Today's project was different, I took the top inch from a pair of 30-06
cartridges, annealed it several times and formed it into a trumpet bell shape
to be used as high voltage stress relief, by sliding it under the braid on a
hunk of RG213 coax being used as high voltage cabling in a Harris tv
transmitter, that forms a flare in the electrical field where the grounded
braid stops but the center wire continues on another 6 inches and connects to
a 7700 volt DC power supply good for about 12 amps. Basically getting rid of
the sharp edges where an arc-over can get started.
Even us tv engineers get to play with the big, potentially noisy stuff. :-)
But its in the 90's and has about wrote a ~30~ to the days activities for this
old fart.
Thanks, Jim. All this gets stashed for future referfences.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
People disagree with me. I just ignore them.
-- Linus Torvalds, regarding the use of C++ for the Linux kernel
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