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Subject:
Re: 2 axis slider
From:
jason jay stevens <[log in to unmask]>
Reply To:
Informal Science Education Network <[log in to unmask]>
Date:
Mon, 22 Dec 2008 10:44:04 -0600
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ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************

Jeff--

Can you seperate the user from the lens with one more layer of  
mechanicals?  For example, can you use a little chain drive system  
with a crank?  Or selsyn motors?

If one of your axes is vertical, you'd need to be concerned with old  
Father Gravity, too.

How about a magnetic cushion?  Attach magnets of one pole to your  
lens armature, and magnets of another pole on your frame.  If the  
magnets are reliable and strong, an over-exhuberant user could shove  
the lens at top speed, but as long as it's prevented from reaching  
another rigid body  (in this case by magnetic field) for impact, it's  
all good, right?

Just brainstorming.  I have sketch book pages full of doodles of two  
axes sliders--for some reason I daydream about these things every so  
often-- but I have never built one.


--Jason



__
JasonJayStevens
JasonJayStevensStudio
[log in to unmask]
www.potterbelmar.org/jjss
536 Roosevelt Avenue
San Antonio, Texas 78210
210.818.0642




On Dec 22, 2008, at 10:06 AM, Jeff Courtman wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology  
> Centers
> Incorporated, a worldwide network of science museums and related  
> institutions.
> ********************************************************************** 
> *******
>
> I need to build a 2 axis slider to move a magnifying lens around a  
> large graphic (think of 'where's waldo').  I plan on using linear  
> bearings and wanted to know from those of you with experience what  
> might be the best way to control the friction in the movement (so  
> an over-exuberant 7 year old, like my son) can't wind up and sling  
> it from one side to the other.....
>
> Thanks in advance,
>
> Jeff
>
> 	
>
>
>
> ********************************************************************** 
> *
> For information about the Association of Science-Technology Centers  
> and the Informal Science Education Network please visit www.astc.org.
>
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> www.exhibitfiles.org.
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For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.

Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.

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