![]() It has a larger RA gear and a small worm gear to drive it. The CEM 26 is a fairly typical equatorial drive. So dealing with an ever-changing level of DEC backlash was frustrating. I really wish that IOptron had made both parts of metal, and then maybe I could control this issue. It turns out that one part of the mount was plastic - and I was afraid to crank down too tightly on the mount for fear of cracking the plastic. ![]() So if things are drifting - then just tighten the motor mount screw more so that they don’t move with time - right? Then I could tighten the screws holding the motor. Not a convenient thing.Īdjusting the tension meant that I had to remove the outer drive housing, loosen the screws that mounted the belt drive motor, and then use a screwdriver to leverage the motor such that more tension was placed on the mount. It also meant that I had to keep adjusting the tension. This meant the backlash on the DEC axis was constantly changing - not a good thing. I found that over time, the belt tension would change, and my DEC backlash would begin to grow again. ![]() The residual backlash was easily handled by the PHD2’s backlash compensation mechanism and the right DEC guiding parameters.Īt this point, I was happy with the solution - if it stayed constant. Increasing the tension reduced the backlash from 5 seconds to under 1 second. I found I had over 5 seconds of backlash when I first received the mount, so I contacted IOptron support, and they quickly provided me with a one-page procedure for adjusting the tension of the DEC drive belt. The first issue I ran into was backlash on the DEC axis.
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