Hello.... would you mind please passing along the name? Thanks.?
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So - indeed the spring will introduce some backlash. Ideally, if it is the proper spring tension (extension), it will be minimal but this relies heavily on how much static friction the axis presents. If very low then the lash will be near zero. I designed it this way for two simple reasons - because a) to get Obsession to agree to install the product on their new scopes (we're talking late 2002 now) the system HAD TO BE retrofittable onto existing telescopes. It could not be a 'custom' design and b) because the end user had to install the system I had to have some small amount of compliance adjustment for the cable drive. Getting the end user to make the perfect length cable would have been impossible. Ideally if low friction one doesn't need the spring - but the (opposite/free) end of the shaft of the roller should then be held to take up the tension caused by 'full tension' in the cable. So it works - and works well as a retrofit.?
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Gary Myers
StellarCAT
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