Re: My first ARSG, or a Dangerous Design?

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

Original poster: "Crow Leader by way of Terry Fritz <teslalist-at-qwest-dot-net>" <tesla-at-lists.symmetric-dot-net>

A set screw probably won't press into tungsten and lock in place. It sounds
likely that the collars themselves would fly off.

KEN


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, January 24, 2003 1:33 PM
Subject: Re: My first ARSG, or a Dangerous Design?


 > Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<Esondrmn-at-aol-dot-com>
 >
 > In a message dated 1/23/03 5:56:50 PM Pacific Standard Time,
 > tesla-at-pupman-dot-com writes:
 >
 >
 > >Hi Scott, Dan, Terry B, All,
 > >
 > >OK here is some CONSTRUCTIVE criticism. IF there really is a problem of
low
 > >coefficient of friction causing slippage, here is one way it can be
easily
 > >cured:
 > >1) Push tungsten rod through an externally taper-threaded piece of split
 > >brass tube, so that the tube is in the middle of the rod. The tube must
be
 > >about 0.5" longer than the width of the hub. Hole in hub should also be
 > >threaded.
 > >2) Thread tube with rod in it through hub.
 > >3) Put a locknut on each end of tube to both lock rod into tube and hold
 > >tube locked into position in hub.
 > >4) Balance and Run.
 > >5) Naturally, all plastic parts subjected to rotational stress must be
 > >inspected periodically for wear and replaced when wear is observed. This
is
 > >true for HDPE, Nylon, Lexan, or G10.
 > >
 > >Without these modifications, even at 15,000 rpm, the tip speed of an 8"
 > >rotor is  ~524 fps. If the rod did start to slip out, it would impact the
 > >stationary electrodes before it could leave the hub. While this would
most
 > >likely wipe out the rod, the electrodes, and the hub, it would be less
 > >dangerous than an airborne disk or tangentially-flying small electrodes.
 > >The design is very creative and hardly what I would call "makeshift".
 > >
 > >Matt D.
 >
 >
 > Another idea would be to use some locking collars on each side of the
 > flying electrode, butted up against the poly block that it is pressed
 > into.  I noticed I have some of these in my model airplane hardware
 > box.  They have set screws in them for locking and I am sure they are
 > available with different size holes in the center (to fit different
 > diameter rods).
 >
 > Ed Sonderman
 >
 >
 >