Re: My first ARSG, or a Dangerous Design?

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

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi,

I would not use set screw type collars but rather 'real' clamp types 
collars like these:

http://hot-streamer-dot-com/temp/P1250065.jpg

Here I am using 1/4 inch bore collars to lock titanium 'spears' onto a 1/4" 
titanium shaft (long story ;-))   http://hot-streamer-dot-com/Ti-Tan!!/  ))

McMaster-Carr has 1/8 inch collars like # 6435K11.  These babies don't just 
fall off ;-))  They would be bullets if they did, but they "stick"to that 
titanium rod like a rock.  A little loctite or other glue would hole them 
even if the lock screw did give.

I would think these collars would be great for a tungsten rotary rod 
especially if one loctited them in place.  If one could lathe in a holding 
rib into the tungsten rod too, it would go nowhere.

Perhaps a design like this would be good:

http://hot-streamer-dot-com/temp/030125-01.gif

The collar is contained here, but it does require real machine tools now...

Cheers,

         Terry



At 07:51 PM 1/25/2003 -0600, you wrote:
> > Original poster: "robert & june heidlebaugh by way of Terry Fritz
><teslalist-at-qwest-dot-net>" <rheidlebaugh-at-desertgate-dot-com>
> >
> > Ken: Tungsten and tungsten carbide silver solder with no problem. A brass
> > mount or sleeve can be easly silver soldered to the rod. A dimple can also
> > be ground into the tungsten rod to act as a detent for a set screw to hold
> > -   Robert  H-
>
>Dimples in brass or flats ground into the tungsten rod with opposing collars
>are just more items to 1) try to fly away 2)add way more vibration when
>things get imbalanced 3)when unbalanced they are extra weight that tries to
>pull the shaft out of the plastic block or whatever you use to attach the
>rotor to the motor shaft.
>
>Securing the tungsten rod closet to it's center is the best place to hold it
>in place. The forces there are the smallest. However as others mentioned, it
>probably does not matter if keep the RPMs low. I'd avoid being near any
>"quick and dirty" devices running at 10,000 RPM.
>
>KEN