Re: [TCML] Copper Tungsten Alloy

[jhowson4@xxxxxxxxxxx]

How did you manage to get just 1 foot from them? 


my 2 cents on Midwest Tungsten 
Last summer when I was organizing a tungsten buy I gave the Midwest guys a call just to see if my contact was ripping me off (he works for a big EDM machining / welding company that buys tungsten rods in bulk for welding, he cuts me great deals actually). 
Anyway, Midwest would only sell to me in 1 meter stock lengths for the larger sizes, with the exception of 20" of 1/4. 
And they charged 25$ for a cut on anything... 
not that cutting matters for me as I can cut everything except the 1/2", 
But I can't do 1 meter stock lengths because it wont fit into my jig. I'm limited to about 13". 

Not to mention that a 1m stock length is significantly more expensive to ship than 7" chunks. 




Thanks, 
John "Jay" Howson IV 


"Why thank you, I will be happy to take those electrons off your hands." 

----- Original Message -----
From: "Brandon Garretson" <garretsontech@xxxxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 
Sent: Wednesday, May 2, 2012 8:14:12 AM 
Subject: Re: [TCML] Copper Tungsten Alloy 

Midwest Tungsten Service, give them a call. 
800-626-0226 
www.tungsten.com 
They have every alloy. 
I bought a foot for about $35 and cut it myself with a diamond blade on my 
Dremel. 

On Tue, May 1, 2012 at 9:00 PM, Matthew Edwards <matthew.n.edwards@xxxxxxxxx 
> wrote: 

> Thank you, my interest in this was because it is much cheaper online than 
> standard tungsten rod. 
> 
> Matthew Edwards 
> 
> On May 1, 2012, at 5:12 PM, Brandon Garretson <garretsontech@xxxxxxxxx> 
> wrote: 
> 
> > It'll burn up a lot faster. 
> > I use .250" 97% tungsten and it conducts just fine. 
> > After a long run I only need to wipe the carbon off, with that much 
> copper 
> > you would need to grind the tips and re-adjust more often. 
> > 
> > 
> > 
> > On Tue, May 1, 2012 at 3:47 PM, Matthew Edwards < 
> matthew.n.edwards@xxxxxxxxx 
> >> wrote: 
> > 
> >> I was wondering if anyone has tried using copper tungsten alloy for 
> spark 
> >> gap. I have noticed some listed on ebay as grade 50-235 which appears 
> to be 
> >> 70% tungsten, 30% copper. It seems like it would be a good material to 
> use 
> >> but I wanted to get some "expert" opinions. 
> >> 
> >> According to wikipedia; 
> >> 
> >> CuW alloys are used where the combination of high heat resistance, high 
> >> electrical and thermal conductivity, and low thermal expansion are 
> needed. 
> >> Some of the applications are in electric resistance welding, as 
> electrical 
> >> contacts, and as heat sinks. As contact material the alloy is resistant 
> to 
> >> erosion by electric arc. WCu alloys are also used in electrodes for 
> >> electrical discharge machining and electrochemical machining.[2] 
> >> 
> >> There is a chart on this page displaying the properties of the alloy. 
> >> Resistivity, etc.. 
> >> http://en.wikipedia.org/wiki/Copper-tungsten 
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