Re: AW: [TCML] Coil pic w/ SRSG

[Joe Mastroianni <joe@xxxxxxxxxxxxxx>]

I agree about the long (2") electrodes.  I couldn't get them shorter from McMaster Carr.
So I figured I'd get the 2" long ones and cut them.
Then I figured out I didn't know how to cut tungsten.  I mean - don't you need something harder than  tungsten carbide to cut tungsten carbide?
Rather than shattering the electrodes, I just put them in as is for now, but I do need to cut them in the final build.
Any advice on cutting tungsten rod would be much appreciated - I mean, if the answer is using a hacksaw and a bi-metal blade, I'll just do that...;-)
Joe


On Jul 5, 2010, at 2:09 AM, Fritz W. Egli wrote:

> May I succest that you mount a protecting shield over the (long ...)
> rotating electrodes - ? There is some leverage, some centrifugal force at
> speed. 
> Perhaps you can also shorten the electrodes. 
> Opinion, succestion of a mechanic. 
> Kind regards, Fritz W. Egli
> 
> -----Ursprüngliche Nachricht-----
> Von: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] Im Auftrag
> von Joe Mastroianni
> Gesendet: Montag, 5. Juli 2010 02:11
> An: Tesla Coil Mailing List
> Betreff: [TCML] Coil pic w/ SRSG
> 
> Pics of Coil v1.2 - 
> 
> New 30ga 22" secondary - wound by Dan M....  New Toroid, bought at
> amazing1.com
> 
> 3 deck MMC - each w / 18 series  CDE 942C20p15K-F (each shorted with 10M
> 1/2W resistor).   Same Terry filter.  
> 
> Sync motor acquired from Alan in Mn, with 4" garolite wheel.   Inserted 4 2"
> tungsten rods with collars into the garolite.  I actually also acquired from
> mota.com a 1/30 hp sync reaction motor (oriental motor) upon which I will
> base my next attempt at an SRSG - but Alan's motor came with a mandrel and
> so made it easier.  Cut a copper disk and epoxied it to the back of the
> garolite disk to short out the tungsten rods.   If anyone has any methods
> for cutting copper sheet other than using a metal nibbler and filing your
> brains out, do let me know.
> 
> Gaps are about 1/16".   As it turned out, I didn't have to move the
> insulators upon which I mounted the stationery tungsten gap rods I had been
> using for my static gap.   I merely rotated them 90 degrees to point to the
> rotor and used taller insulators.  So I also left my squirrel cage fan,
> which I'm hoping doesn't hurt anything. 
> 
> I now don't have to have the variac voltage very much more than 1/2 to get
> breakout.  I've tried adjusting the phase, but once you've got the disk
> dwell dialed in, the phase adjustment is kind of tweakage to get max spark
> length (I have found - may be doing it wrong). 
> 
> Will take pictures/video of the coil running as well.
> 
> http://yfrog.com/emfcj  is the start of the 3 pic series.  Only iPhone
> pictures (don't own an actual camera...have to get one.)
> 
> Cheers and thanks for everyone's great help, especially John and Gary!
> 
> Best to all,
> Joe
> 
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