[simpits-tech] Potentiometers

[Marv De Beque]

Neat idea!  However, you don't quite get true linear movement.  It's good in
the middle, but it will gets worse as you get to either end.  May not be a
problem for some applications or if you have an EPIC system you can
compensate for the difference.

I used something like Steve's method with two pulleys.  I didn't have
fishing line or a miniature turnbuckle, so I used dental floss (dewaxed) and
I made the plate that the pot mounts to movable so I could adjust the
tension.  The problem with this is finding the right size pulleys so the
ratio is correct.

Marv
-- 


> From: Rod Dale <rodd@castle.net.au>
> Reply-To: simpits-tech@simpits.org
> Date: Mon, 13 May 2002 19:33:07 -0700
> To: simpits-tech@simpits.org
> Subject: Re: [simpits-tech] Potentiometers
> 
> An easy way to use linear motion on a rotary pot is to fix the body so it
> can't move, connect the shaft to the chuck of a cheap carpenter's hand
> drill (as if fitting a drill bit) then connect your operating arm to the
> handle of the drill (the piece you turn to operate the drill). The arm can
> be moved almost 180 degrees while the pot shaft will turn it's full 270
> degrees or whatever it is rated at. Depending on the gearing of the drill,
> you may not need to move the arm very far to get full rotation of the pot.
> Rod
> 
> At 01:14 AM 5/13/02 -0500, you wrote:
>> Ed Henderson wrote:
>>> 
>>> Yea, now I am starting to think rotary...  I guess it would be easier
>>> to mount an arm on a rotary.  Then the throw would be much more
>>> adjustable.
>> 
>> Probably the easiest way would be to mount the pot to a plate somewhere,
>> stick a pulley on the shaft, and use the heaviest Spider Wire fishing
>> line you can find to move the pulley. It would need 2 arms on the stick,
>> each the same length and distance from the pivot. Attach the wire to one
>> arm, then wrap it wound the pulley a few times, then to the other arm.
>> Put a tiny turnbuckle at one end to tension it and it should work
>> perfectly for years.
>> --
>> Steve
>> lt1_z28@swbell.net http://www.mysticz28.org/
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> 
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