Re: Big Toroids, collective conscious brain storm

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Jim,

When I started my 8x32 toroid using Al ducting material, I tried to 
use bondo to fill.

+ Adhesion good
+ Sands smooth

- Expensive
- Takes a lot to fill the ridges
- Sanding goes slowly
- Its a two part material and the work time is too small

Someone mentioned a material that is akin to liquid balsa wood.

+Lighter than bondo
+Maybe easier to sand

-Dont know product name nor where to buy
-Hobby shop has stuff but only in small tubes (but this might be a 
start to getting some in bulk)
-Small tube was expensive (per oz)

Also someone mentioned a two part foam that could be used to fill the 
ridges (dont know the name).

+Readily available in bulk
+Not too expensive (iirc)
+Adhesion is good
+Sands easily

Gerry R

> Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
>
> My limited experience proves that attaching a smaller diameter, say 4" minor
> of  dyer duct by 18 or 19" (scale as needed) added surprising plane rigidity
> to the 8" x 32"+ business end toroid with dual pizza pans center. This
> clearly reinforces the top hat which is still reasonably horizontal with no
> visible plane distortions.
>
> Ok, so we are down to the filling the ridges, and dent deterrent.
>
> Bondo.