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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
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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
>
>
>
>
>
> **********************************************************************
> *
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