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RE: Re[2]: First light...Sort of
>Original Poster: Aric_C_Rothman-at-email.whirlpool-dot-com
>Since I made an enclosure for the RQ gap that includes a 1 HP vacuum
>motor for cooling/quenching, I'm thinking about building a new RQ gap
>with the same form factor. I think I erred in using the same tube as
>my secondary coil form as support for the RQ gap. It's the
>thin-walled, sickly-green PVC pipe used for low-pressure waste lines.
>Has anyone had similar problems using the thick PVC? Would the
>chloronated PVC be a better choice. What bonding method should be
>used to join the Cu pipes to the PVC? I used JB Weld (epoxy) followed
>by Pop Rivets.
>What is another more heat-resistant material, available in a 4" OD
>tube, that would be more suitable than PVC (excluding such
>astronomically expensive options as phenolic and teflon tubes).
>
>Aric
The enclosure for such a cylinder gap needs to be made out of a thick walled
material, not only for better heat resistance, but for general stability.
The thin stuff flexes too much and the gap spacing shifts as a result. Home
Depot sells some thick-wall PVC couplings for 4" PVC pipes, already precut
to a nice length. I used a small piece of G10 fiberglass between my copper
pipes and the PVC surface, although I'm not sure the pipes ever got that
hot that it was necessary. Do you have a fan blowing over and cooling your
pipes?
I just used 1/4" screws and nuts to secure the pipes.
You can see my cylinder gap at:
http://people.ne.mediaone-dot-net/lau/tesla/tesla.htm
<http://people.ne.mediaone-dot-net/lau/tesla/tesla.htm>
Regards, Gary Lau
Waltham, MA USA