Re: Notes-Questions-Article-All

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Hollmike-at-aol-dot-com>

Well, It would seem that it could be done, but perhaps a bit more thought 
would be in order before trying such a thing.  I joined the ends of my toroid 
by affixing tabs(cut from roofing flashing) to the inside of one end with 
epoxy and then to the other, once the first step dried well.  I think it made 
a very strong joint.  I also applied a bead of epoxy to the seam itself.  I 
would almost guess that the toroid would split at one of the corrugations 
before parting the ends.   Perhaps one could estimate the proper amount of 
foam by the time that the valve is opened or something.  Perhaps even the 
location of the injection hole might be a factor.  I would think that the 
hole should be close to the seam so that part of the foam would set while the 
rest was still expanding.  I dunno.  I am still just musing. 
Mike 


>
> Been there, done that.  There were two problems. 
>
> First, this is a blind process - you can't see inside the toroid to know how 
> full it is and when to stop adding more. 
>
> Second, the nature of the expanding foam that I used (called "Great Stuff, 
> at Home Depot) is that it continues to expand with great force over a long 
> period of time.  It will burst the seam where you join the flex duct ends. 
>
> Gary Lau 
> MA, USA