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Re: FROM HAL - Starfish Spinner



Original poster: Frank <fxrays@xxxxxxxxxx>

A cheap jeweled bearing is available from sporting goods or novelty shops. Buy a cheap 1 1/2" or 2" compass and take it apart. You have the jewel and a hub you can make a low friction spinner out of. Any good sharp pin will be a good shaft.
Frank

At 11:08 PM 2/27/2007 -0700, you wrote:
Original poster: "resonance" <resonance@xxxxxxxxxxxx>




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.

Dr. Resonance

Ed was curious how fast my spinner spins, so I shot another video to show
him:

http://www.halice.com/physics/4coil/spin2.wmv

I don't think it is revolving much fast than 2 to 3 times per second. Here
is the video of it in the dark again:

http://www.halice.com/physics/4coil/spin1.wmv

Hal in Tucson


----- Original Message -----
From: "The Krohns" <2halice@xxxxxxx>
To: "Tesla list" <tesla@xxxxxxxxxx>
Sent: Monday, February 26, 2007 2:40 AM
Subject: Re: FROM HAL - Starfish Spinner


> Hi Ed,
>
> After running the coil for about 5 minutes, the spinner looks as though > it
> is revolving approximately 3 revolutions per second, or 180 rpm.  I'm
going
> to take DC's advice and raise the spinner's pivot point tomorrow
afternoon.
> I'll place a timing mark on the spinner and video tape it during > daylight
> hours.  I'll put the video on my Web site and post the URL on the List.
> I'll try to do this early enough tomorrow afternoon so that our > moderator
> should be able to post it before dark MST.  This is so much fun!
>
> Cordially, Hal in Tucson
>
>
> ----- Original Message -----
> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Sunday, February 25, 2007 6:05 PM
> Subject: Re: FROM HAL - Starfish Spinner
>
>
> > Original poster: Ed Phillips <evp@xxxxxxxxxxx>
> >
> > Neat picture.  How fast does the spinner run?  Not light enough to
> > see very well and the strobe effects with the sparking make it hard to
> tell.
> >
> > Ed
> >
> >
> >
> >
> >
>