Re: Toroid construction hints

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: FutureT-at-aol-dot-com 

In a message dated 2/13/04 10:16:40 AM Eastern Standard Time, 
tesla-at-pupman-dot-com writes:

Ian,

There is a wonderful way to join the ends of corregated ducting.
I don't use any tape or covering.  I simply cut the ends as evenly
as possible so no metal sticks up.  Then I cut a piece of wood
that fits into the ends of the ducting.  This wood should be
specially shaped with a double curve of sorts.  The wood is a
round plug basically, but has another curve in it which lets
the joint curve to the same degree as the rest of the toroid.
This wooden plug should be 1.5" thick.  Half of the plug enters
one end of the ducting, and the other half enters the other
ducting end.  Next tiny nails (brads) are pressed through
the ducting between the ribs and into the wood.  About 10
nails are used.  The heads of the nails fit beween the
ribs of the ducting.  Use a punch to hammer the nails below
the ducting rib surface so you don't dent the ducting.  If done
correctly, this joint will not show, and will not preferentially
break out with sparks.

John


>?  I thought I had smoothed the tape out
>pretty well, but it is certainly not as uniform as the ducting itself.  Any
>ideas anyone how I can improve this situation ?
>
>Ian
>Ian.
>