Re: ASRG

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

Original poster: "Terry Blake by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tb3-at-att-dot-net>

Perhaps you can enlighten us further with some photos of your work on a web
site.  It sounds very interesting.  I take it you found the construction
relatively painless.  I'd like to hear any other thoughts you may have on
these designs.

Maybe you can recommend a minimum safe spacing for setting the gap.

Terry Blake
Coiling in Chicago

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, November 23, 2002 10:05 PM
Subject: Re: ASRG


 > Original poster: "tesla by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<tesla-at-paradise-dot-net.nz>
 >
 > Hi Terry et al
 > To amplify
 > My first attempt at your design featured tunsten tips brazed onto a brass
 > rod. Brass as you know is an excellent conductor of heat so the rod got
hot
 > over much of its length.
 > This is different than your rotor made entirely of tungsten.
 > My current design is now two tngsten rods (to get the reqd 226mm length)
 > brazed into a brass sleeve in the centre.
 >
 > My rotor is 226mm long. As you may imagine the amount of expansion due
 > heating is a proportional to temperature and the length.
 >
 > Your design features much longer metal electrodes than conventional axial
 > elctrodes fastened into insulating rotors hence the potential for rotor
 > expansion is much greater. As you comment  end play is not an issue in
this
 > design it is possible to achieve very close spacing between static and
 > rotating electrodes.
 >
 > This is not a problem if you account for it. My inital set up clearances
 > were very very close so I was asking for trouble  in my first attempt
using
 > 15mm long tungsten tips on brass rod. (The brazing melted BTW)
 >
 > I use a "feeler guage" now to set up my spacing and now have no problem
 > noting that I am now using tungsten the entire length. As you comment with
 > this technique centre heating is minimal.
 >
 > I hope this clarifies my comments
 >
 >
 >
 >  > Hmm,
 >  >
 >  > While the entire rotor is metal and long, numerous people have checked
the
 >  > rod after a run and found that it was cool near the center.  The heat
did
 >  > not travel that far down the length.  But I will check this out in more
 >  > detail.
 >  >
 >  > Not sure what you mean by point #2. Every RSG I have seen is set up so
 > that
 >  > as the electrodes expand, they will tend to close the gap.  Can you
give a
 >  > photo example of what you mean?
 >  >
 >  > One thing I now notice about this design.  It is not sensitive to play
in
 >  > the motor bearings.  So a worn or lose bearing will not cause unwanted
 >  > contact.
 >  >
 >  > Terry Blake
 >  > Coiling in Chicago
 >
 >