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Re: Wood
to: Alex
Wood is ok for enclosures as long as you keep all HV wires at least 2 inches
away from the wood. Use white delrin (a plastic) rod for electrode and
primary holders. Notched delrin works great.
Regards,
Dr.Resonance-at-next-wave-dot-net
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Thursday, May 13, 1999 3:21 AM
Subject: Wood
>Original Poster: Alex Crow <user-at-alexcrow.clara-dot-net>
>
>Dear All
>
>I was looking through various posts about materials for SG boxes and
>Primary supports, and I noticed that many people have said that wood is
>a bad material for these purposes. However, I have used it very
>successfully in my coil in all HV areas and as yet it hasn't even got
>warm or displayed any kind of tracking. What I did was to soak every
>piece throroughly, several times, in transformer oil. I am using 8mm
>plywood for most of these bits, and I found it was quite absorbent.
>I allowed this to soak in for several days, at which point I liberally
>applied varnish. Due to some oil still oozing from the wood, it takes an
>age to dry (think in days here) but I found that once it had done so it
>set quite hard and the wood actually felt like plastic to the touch.
>I tested this with my NST output, even trying to induce tracking by
>using pins as electrodes and it didn't draw any current or spark. I
>think that the oil must have displaced the water (2% or so, I hear) that
>is common to most woods - the Xfrmr oil is very non-viscous and
>penetrating - I spilt some on the concrete and thought there would be a
>stain there forever, but in three or four days it had disappeared.
>
>Anyone else have any experience with using wood at HV successfully?
>
>Alex Crow
>
>