Re: FROM HAL - Starfish Spinner... Reply to Bart

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "The Krohns" <2halice@xxxxxxx>

Hi Bart,

As shown in my second video (http://www.halice.com/physics/4coil/spin2.wmv),
I took DC's advice and raised the spinner about 20" above the toroid.  It
definitely improved the angle of the streamers but they were still being
deflected away from the toroid and the height didn't seem to improve the
maximum RPM.  I haven't seen the spinner in the dark at its improved
elevation.  I'm going to go out right now and check it out.  If it's
impressive enough, I'll make a another video.

Cordially, Hal in Tucson


----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, March 01, 2007 10:52 PM
Subject: Re: FROM HAL - Starfish Spinner... Reply to Bart


> Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>
> Hi Hal,
>
> Your spinning star works excellent. My comments were more based on
> the generalized topic that resulted from your post. Someone mentioned
> graphite in one of the posts here. I used it myself (had a tube of
> powder graphite from several years ago when I was helping my son with
> a soap box derby. It does help with large surface area contact, but
> the smaller the contact surface (needle to saddle), the less effect
> the graphite has. The smaller the contact area, the less the
> friction, and then graphite is unnecessary.
>
> I like your spinning star. Nice job with that gizmo! DC mentioned
> raising it up and I think he's right. You might want to try it about
> 15" up from the top of the toroid and see how the sparks fly off.
> Might be interesting to see the sparks emit in a horizontal
> direction. My spinners were similar in height as yours and the sparks
> flew off in an upward direction as well. I may have to try it again
> with the spinner higher on the coil and maybe even something similar
> in fashion as you've created (well, the next time I get urge).
>
> Take care,
> Bart
>
>
> Tesla list wrote:
>
> >Original poster: "The Krohns" <2halice@xxxxxxx>
> >
> >Hi Bart,
> >
> >Thanks for your input.  It's always good to hear from you!
> >
> >Currently, I'm rather satisfied with my original bearing system.  I
drilled
> >a hole in the middle of the spinner to staticly balance it.  So, I filled
> >the hole with the smallest set screw that I could find at Ace Hardware.
I
> >positioned the set screw hex end down, so that my homemade brass pivot
point
> >sits in it.  I secured the set screw in place with two lock nuts, one on
> >both sides.  The thing spins really well.  If you haven't seen the two
> >videos of my spinner, here are the links:
> >
> >http://www.halice.com/physics/4coil/spin1.wmv
> >
> >http://www.halice.com/physics/4coil/spin2.wmv
> >
> >Cordially, Hal in Tucson
> >
> >
> >
> >
> >----- Original Message -----
> >From: "Tesla list" <tesla@xxxxxxxxxx>
> >To: <tesla@xxxxxxxxxx>
> >Sent: Thursday, March 01, 2007 12:08 AM
> >Subject: Re: FROM HAL - Starfish Spinner
> >
> >
> > > Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
> > >
> > > I've built a few various spinners. Bearings suck! Too much friction
> > > (all types). The best I used was a homemade needle. I had to get
> > > everything balanced well to spin well. I've tried low friction nylon
> > > bearings and small standard steel bearings, but a needle riding in an
> > > indent worked better than anything else. Balance of course is just as
> > > important.
> > >
> > > Take care,
> > > Bart
> > >
> > > Tesla list wrote:
> > >
> > > >Original poster: <davep@xxxxxxxx>
> > > >
> > > >
> > > > > Sometimes a good jeweled needle bearing assembly can offer even
less
> > > > > friction.  They are not too expensive and have very low
> > > > > friction.  They are also made in very small sizes.  Tucson Bearing
> >may
> > > > > be able to order them for you.
> > > >
> > > >  a good, metal, 'point in cup' bearing, is quite good, better than
> > > >  ball bearings fro starting friction, and easy 8)>> to had craft.
> > > >  Built a spinner once that way for the relatively low
> > > >  voltage of 15kvdc...
> > > >   best
> > > >    dwp
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
>
>
>
>
>