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Re: Fan for sparkgap (fwd)
---------- Forwarded message ----------
Date: Mon, 24 Feb 1997 17:14:45 -0500 (EST)
From: Esondrmn-at-aol-dot-com
To: tesla-at-pupman-dot-com
Subject: Re: Fan for sparkgap (fwd)
In a message dated 97-02-23 23:21:35 EST, you write:
<<
I just build a "Richard Quick" style spark gap in a piece of 6" PVC. I
found a fan in the Hosfelt catalog that has exactly the right diameter
to mount directly to the PVC. Specifically, fan #26-455 is 6 3/4"
diameter (235 CFM), and I was able to drill and tap the edge of the PVC
to match the 3 mounting holes in the fan. I then mounted the fan with
8-32 nylon screws into the PVC. I also wrapped a layer of electrical
tape around the joint for a better air seal.
This may be of interest to other folks because it saves the cost of a 6"
PVC cap (which sells for $40 here)!
Out of curiousity, what have folks on this list paid for 6" PVC caps?
Was I being ripped off?
Steve Falco
>>
Steve,
Are you in the U.S.? I do think you got ripped off. I built two of these
gaps about 14 months ago. I think I paid maybe as much as $10.00 U.S. for
each end cap. These had rubber seals in them which I discarded. I cut a
hole out of the center on the lathe and mounted the fan with 4 # 10 screws.
I just press the end cap in place (no attachment) so I can easily gain
access to the gaps for cleaning. The gap has legs on the bottom that space
it up off the table by about 2.0" to allow good air flow. Someone on this
list has mentioned the gaps changing over time as the pvc moves - from heat?
I have not experienced this, maybe because the heavy end cap forces the pvc
pipe to hold its shape.
Ed Sonderman