RE: [TCML] re: Tufnol whale board as rsg base

["Phil Tuck" <phil@xxxxxxxxxxx>]

I use Tufnol both as a base and for the disc with no problems. Electrodes
are Tu, power is around 7kW

http://www.hvtesla.com/images/tesla-coil-srsg-mod.jpg

phil


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Henry Hallam
Sent: 09 October 2011 05:42
To: Tesla Coil Mailing List
Subject: Re: [TCML] re: tufnol whale board as rsg base

A long time ago I used a tufnol disc as the rotor on an ARSG running at
around 10k rpm.  It eventually caught fire and failed, throwing the
electrodes across the room, so I can't exactly recommend it - but I think
that was because I used steel electrodes which quickly heated, and I
generally didn't know what the heck I was doing.

Henry

On Sat, Oct 8, 2011 at 3:59 AM, mark redfearn
<professordreads@xxxxxxxxxxxxx> wrote:
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> Date: Fri, 7 Oct 2011 12:00:02 -0600
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>  thanks henry,that gives me more hope, i actually got round to testing the
conductivity of the whale board yesterday with a 10/50 nst,it didnt conduct
at all, not even when the nst hv leads were scratched alond the th rough cut
edge with the fibres slightly exposed.whether or not it will stand up to a
capacitor being discharged through it at rf is another matter, im still
getting used to all the things that i thought were an insulator,are not at
hv rf :).one more question though, i asked the suplier to send me some
pieces of this same material,tufnol whale board 25mmx 25mmx 50mm cut from
25mm sheet to use as the arbour for connecting the electrode to the
10,000rpm motor,in the terry blake fasion. do you think this will stand up
to high speed centrifugal forces imposed, my other option for the arbour
material is hdpe block but my psu is mot based and i fear that the hdpe may
melt and throw the electrode during a long run,i will have shaft collars
fitted to the elecetrode but i dont think they will help if the arbour
melts,unbalances,crashes,explodes the rsg assembly,ruins my day.thanks
again,mark.
>
>
> --Forwarded Message Attachment--
> From: henry@xxxxxxxxxxxxxxxx
> To: tesla@xxxxxxxxxx
> Date: Thu, 6 Oct 2011 14:50:39 -0700
> Subject: Re: [TCML] tufnol whale board for rsg base
>
> Tufnol is a decent insulator but if it gets too hot from either 
> thermal conduction or an arc along the surface it will char and become 
> a conductive flaming mess.  If you're careful it should be OK as a 
> base on which to mount the stator electrodes for an RSG.
>
> Henry
>
> On Thu, Oct 6, 2011 at 6:09 AM, mark redfearn 
> <professordreads@xxxxxxxxxxxxx> wrote:
>>
>>
>>
>>
>>
>>
>>
>>
>> From: professordreads@xxxxxxxxxxxxx
>> To: tesla@xxxxxxxxxx
>> Subject: tufnol whale board for rsg base
>> Date: Thu, 6 Oct 2011 11:20:01 +0000
>>
>>
>>
>>
>>
>>
>>
>> hi guys, this is my first post.i checked the archives first about the
following question but found nothing.i would like some input on tufnol whale
board, i recently bought some to construct a 'terry blake propeller gap'i
intended to use this as the base 250x250x6mm on which to mount 8 stationaery
tungsten electrodes...however..i just did some research (which i should have
done first) and found out that according to a suplier it is only suitable
for low voltage insulation,i found this quite dissapointing.
>> has anyone else used this and what was your experience,im expecting it
would carbon track after reading on the supliers website.
>> if its not conductive i would also use tufnol in a larger diameter ie
25mmx25mmx50mm to make the arbour for the rotating tungsten electrode ,
having never used this material before im not sure how well it drills or how
brittle it is.
>> any help much apreciated.
>> thankyou
>> mark.
>> --Forwarded Message Attachment--
>> From: mddeming@xxxxxxx
>> To: tesla@xxxxxxxxxx
>> Date: Wed, 5 Oct 2011 10:44:17 -0400
>> Subject: tufnol whale board for rsg base
>>
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