[TCML] Source for copper hardware
dave at leddon.net
Thu Apr 1 11:14:18 MST 2010
Thanks for the crimper endorsement. I notice a bunch of these for
sale on Ebay at lower prices so that's also an option
At 08:19 AM 4/1/2010, you wrote:
>I'm a Harbor Freight tools nut and own way too many of their tools,
>including this hydraulic crimper. I caught it on sale a couple of
>weeks ago and couldn't resist. If you buy it, I do not think you
>will be at all disappointed. It isn't on sale now and I do think the
>price is a bit high when not on sale. If you aren't in too big of a
>hurry, though, they usually put the same things on sale periodically
>and if you keep you eyes out, you will most likely see it go on sale again.
>----- Original Message ----- From: "Dave Leddon" <dave at leddon.net>
>To: "Tesla Coil Mailing List" <tesla at pupman.com>
>Sent: Tuesday, March 30, 2010 11:48 PM
>Subject: Re: [TCML] Source for copper hardware
>>You've got a couple of really good suggestions here. I have
>>everything needed to do silver brazing, except the bottles, which I
>>can retrieve the next time I'm in Las Vegas. So this would be a no
>>cost solution. However, there is one undesirable aspect of
>>soldering lugs that might also apply to brazing. Solder can wick
>>up the wire and inch or two resulting in an inflexible cable near
>>the termination. A small thing but it always bugged me. And then
>>there's the damage to the insulation which could be great at
>>brazing temperatures. Your other suggestion that I get the
>>connections crimped at my local welding store has great merit since
>>I usually buy my lugs there anyway. But maybe the best solution,
>>since I seem to be fabricating a lot of heavy-duty cables lately,
>>would be to buy one of these:
>>At 06:16 PM 3/30/2010, you wrote:
>>>Dave Leddon wrote:
>>>>I've been trying to eliminate hot spots in the primary circuit of
>>>>a relatively high current (~3000 amp) drsstc by replacing high
>>>>resistance connection points with copper. Even a one-inch length
>>>>of 3/8-inch brass bolt can generate enough heat to melt the
>>>>solder right out of a terminal lug. Which raise another
>>>>interesting point, what about solder? It has ten times the
>>>>resistance of copper so maybe all lugs should be crimped.
>>>>I only soldered them because I don't own a crimper large enough
>>>>to deal with #2 welding cable. But I digress. I've not had any
>>>>success locating a source for copper nuts and bolts, probably
>>>>because copper isn't strong enough to be consider a fastener, and
>>>>so have been force to machine my own. I would much rather just
>>>>plunk down the credit card.
>>>>Does anybody know of a good source for copper hardware?
>>>Crimping is common for applications like welding cables. Most
>>>welding supply places can crimp connectors on your cable for you.
>>>"hard solder" (aka silver solder) or brazing is another
>>>alternative. Much higher melting point.. Hey, an excuse to use a
>>>MAPP/Oxy or Acetylene/Oxy rig! I've used one of those inexpensive
>>>MAPP/Oxy sets with the disposable bottles to do stuff.. It gets
>>>expensive if you use much gas, but for a small project, it's not
>>>too bad. MAPP/SolidOx is another possibility which is a bit less
>>>expensive for supplies.
>>>But if you're going to do more than a simple job, it's worth
>>>getting (or renting?) a real oxy/acetylene rig, like refrigeration
>>>guys use, with the small bottles. About $300 or so, including the
>>>bottles and torch. And brazing/gas welding is actually pretty easy
>>>(compared to, say, straight stick welding) with a very small
>>>amount of practice. (as long as you stay away from aluminum.. it's
>>>just hard, because it melts before it changes color)
>>>Have you looked at "split bolts" used in electrical wiring? They
>>>also use copper hardware for high current applications, so a
>>>commercial electrical supplier might have them.
>>>Copper hardware is also used in the marine industries.
>>>And, of course, McMaster Carr might have them..
>>>But.. what you really want is exothermic welding, aka Thermite.
>>>Cad-Weld is one trade name.
>>>Tesla mailing list
>>>Tesla at pupman.com
>>Tesla mailing list
>>Tesla at pupman.com
>Tesla mailing list
>Tesla at pupman.com
More information about the Tesla