On 25 March 2013 22:25, jeremy youngs <jcyoung...@gmail.com> wrote:

> or cable attached weight so as to have constant tension ,
> my thought is how to maintain spool diameter on the steppers? as cable
> winds up then the diameter increases unless a capstan of some sort is
> utilized,

There is a nicely engineered solution here:
http://www.youtube.com/watch?v=RCa8uDFzbsw

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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