Re: Non-copper components, was Re: Forwarded mail.... (steel components) (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sat, 16 Jun 2007 11:31:30 -0500
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Non-copper components,
     was Re: Forwarded mail.... (steel components) (fwd)




Fine stranded copper welding cable works very well also.  Use large copper 
"battery" lugs on both ends.  We use 2 ought for all of our larger coils in 
the 6-20 kVA range and 4 AWG welding cable for coils in the 1.5 to 5 kVA 
range (nst powered coils).  The many small wires in this fine stranded cable 
work very efficient with high freq currents.

It is important to remember, in any circuit, the peak current achieved is 
limited by the highest resistance in any point in the circuit.  This also 
applies to HF circuits.

Another trick is to always terminate the inside primary turn directly to the 
spark gap.  This eliminates one more connection (extra connection on inside 
of pri turn if a wire is used).  Less connections = less resistance.  We 
drill a hole in the upper plate and bend the inside of the primary copper 
tubing down so it passes directly to the grounded side of the spark gap. 
With nsts this would be one of the hot sides.

Dr. Resonance



>
> Sorry, the capacitor leads are not steel. I assumed they were not
> copper because
> of the color (I should have checked my facts!). But as mentioned, it does 
> look
> strange when you have heavy and expensive copper wire connecting to the
> MMC and
> then these really thin leads going to the individual capacitors.
>
> As for connectors in the tank circuit, I cut short sections (~2 in) of 
> copper
> pipe (3/8 diameter) and hammered one end flat and drilled a hole in it. 
> Then I
> inserted the tank wire into the other end an hammered it flat to secure
> it (and
> make a good connection). These connectors are then bolted onto the spark 
> gap
> electrodes and MMC.
>
> On the subject of steel, last summer when I made my first coil, I 
> originally
> made the primary (helical) out of steel wire. This was very, very poor. 
> Spark
> output was about 2-3 in. When I replaced it with a flat copper pipe 
> spiral,
> spark output increased to 16 - 18 in (it was powered by a 10/40 nst).
>
> Cheers,
>
> Tom
>
>
> Quoting Tesla list <tesla@xxxxxxxxxx>:
>
>>
>> ---------- Forwarded message ----------
>> Date: Sat, 16 Jun 2007 00:07:46 -0500
>> From: Drake Schutt <drake89@xxxxxxxxx>
>> To: Tesla list <tesla@xxxxxxxxxx>
>> Subject: Re: Non-copper components,
>>     was Re: Forwarded mail.... (steel components) (fwd)
>>
>> I think what he was saying is that why go to the expense of using heavy
>> gauge (expensive) copper wire in the tank circuit when the MMC leads are
>> only say 16 awg (ish)?  I'm also thinking about that now that I am 
>> starting
>> to near completion on my own coil (12kv/60ma).  Mostly I was wondering 
>> about
>> connections though.  Could you guys throw out some good ways to connect 
>> the
>> tank cap, spark gap, etc?
>>
>> thanks
>> drake
>>
>> On 6/15/07, Tesla list <tesla@xxxxxxxxxx> wrote:
>>>
>>>
>>> ---------- Forwarded message ----------
>>> Date: Sat, 16 Jun 2007 10:29:33 +0800
>>> From: Peter Terren <pterren@xxxxxxxxxxxx>
>>> To: Tesla list <tesla@xxxxxxxxxx>
>>> Subject: Re: Forwarded mail.... (steel components)
>>>
>>> I still have a burn mark on my arm from touching a hot steel bolts used 
>>> as
>>> a
>>> terminal on a rolled capacitor. (Thermal burn not electrical). I changed
>>> them to brass and no heating now.  Also a metal crocodile clip used to 
>>> tap
>>> the primary got hot enough to melt solder. A brass connector has fixed
>>> that.
>>> Hysteresis losses in iron at RF will waste energy so best avoided.
>>> MMC wires are steel? Mine are tinned copper and definitely not magnetic?
>>> Peter  http://tesladownunder.com
>>>
>>> > ---------- Forwarded message ----------
>>> > Date: Fri, 15 Jun 2007 15:46:55 +0100
>>> > From: Tom Trevethan <t.trevethan@xxxxxxxxx>
>>> > To: Tesla list <tesla@xxxxxxxxxx>
>>> >
>>> > Hi all,
>>> >
>>> > I've been 'lurking' on the list for a while now - soaking up lots of
>>> > useful
>>> > information. Now I have a question to ask: how critical to performance
>>> are
>>> > the
>>> > materials that make the tank circuit? I've read that steel is best
>>> avoided
>>> > (due
>>> > to it being ferromagnetic) - but it is dificult and expensive to
>>> construct
>>> > the
>>> > circuit entirely out of copper and tungsten. In my coil I use thick
>>> copper
>>> > cable (8 awg) with copper pipe lugs and I've tried to use brass bolts
>>> > where
>>> > possible (but I use steel nuts and bolts in some places). My primary 
>>> > tap
>>> > is
>>> > made of steel and I also recently found out that the 'brass' bolts I 
>>> > am
>>> > using
>>> > for stationary electrodes in my rotaty gap are actually brass plated
>>> > steel. Am
>>> > I likely to see significant improvements in performance if I go to the
>>> > effort
>>> > of replacing these parts? After all, it seems overkill when the wires
>>> > leaving
>>> > the capacitors of my (and everybody elses) MMC are made of (thin) 
>>> > steel.
>>> >
>>> > Thanks in adavance for any advice.
>>> >
>>> > Tom
>>>
>>>
>>>
>>>
>>
>>
>>
>
>
>
> -- 
> Dr Thomas Trevethan
> London Centre for Nanotechnology
> and Department of Physics and Astronomy
> University College London
> e-mail: t.trevethan@xxxxxxxxx
> Tel: 07952934327
>
>
>
>