Re: Blown Cap

Tesla List wrote:
> >From dwt-at-efn-dot-orgThu May 23 21:48:19 1996
> Date: Thu, 23 May 1996 17:53:59 -0500
> From: David Trimmell <dwt-at-efn-dot-org>
> To: Tesla Mail server <tesla-at-pupman-dot-com>
> Subject: Blown Cap
> Hello fellow coilers,
>  well I can say that coiling is a learning expierience. Just yesterday
>  I blew my newly
> made rolled cap. It was a slight deviation to the standard design we have
> all seen, the difference being an extra layer of 20 mil LDPE for a total
> of 80 mil. This added thickness, I thougth, would allow me to use it in
> service with my 15 KV 120 Ma neon.  Dead wrong! After leting it sit for  So I was
> getting 36-40" sreamers (not to good for a resonator at that power, but
> I'm still working on the design) and then it died! Today I dismantaled the
> cap (a messy job) and located a hole the size of my pinky, it was allong
> the edge of the flashing threw the plastic. I was very carefull in sanding
> and deburring the alluminum and inspected the poly prior to assembly.
>   I would like to say that obviously the standard schools of thought do
>   not apply in TC
> and especially resonator practise. 
>  David Trimmell <dwt-at-efn-dot-org>

Dave, All,

We repair the few caps of the rolled type which we blow by just 
unwrapping to the hole only!  While some one holds the roll, we deburr 
the aluminum, wipe away the carbon and make up poly patches of at least 3 
times size of the hole.  The patches are placed on each side of the 
hole.  The cap is just rolled back up and placed back in service.  A 
thrre minute job.

Richard Hull, TCBOR