Hi all,
Anybody have any experience with Losmandy G-11 and a strange error I am having.
When I set up normally, things run pretty well normal. Then after two or three minutes of normal use, with the star staying right on the crosshairs of the reticle, the star starts to drift ever so slightly, and then there is an audible click someplace down in the right ascension shaft or worm-ring interface, and the star snaps back to the crosshairs. The total drift is about from one side of the crosshairs to the other (12 mm reticle eyepiece in a Celestron 9.25) The cycle repeats with a click-correction every 27 seconds (or so).
I can limit the amount of error by seriously unbalancing the scope--but there is still some drift and correction, and the click still happens at about the same rate.
Here is a picture of a star trail in M-42. You can see gradual drift-then correction, then shift-correction, shift-correction.
I should say that this picture was taken last weekend. So I brought the mount home, changed the right ascension motor and electronics. Same error after this fix. I then took the worm off, checked for dirt, grit, etc in both worm and ring, and then shifted the ring halfway around before resetting the worm gear. Still same problem. Did it all over again. Same error. Of course I adjusted for backlash, etc. each time.
This is one of Losmandy's upgraded worms. I have been using it for a while, although, I cannot remember taking photos with it yet--and that is always more critical.
Any ideas?
Alex
Anybody have any experience with Losmandy G-11 and a strange error I am having.
When I set up normally, things run pretty well normal. Then after two or three minutes of normal use, with the star staying right on the crosshairs of the reticle, the star starts to drift ever so slightly, and then there is an audible click someplace down in the right ascension shaft or worm-ring interface, and the star snaps back to the crosshairs. The total drift is about from one side of the crosshairs to the other (12 mm reticle eyepiece in a Celestron 9.25) The cycle repeats with a click-correction every 27 seconds (or so).
I can limit the amount of error by seriously unbalancing the scope--but there is still some drift and correction, and the click still happens at about the same rate.
Here is a picture of a star trail in M-42. You can see gradual drift-then correction, then shift-correction, shift-correction.
I should say that this picture was taken last weekend. So I brought the mount home, changed the right ascension motor and electronics. Same error after this fix. I then took the worm off, checked for dirt, grit, etc in both worm and ring, and then shifted the ring halfway around before resetting the worm gear. Still same problem. Did it all over again. Same error. Of course I adjusted for backlash, etc. each time.
This is one of Losmandy's upgraded worms. I have been using it for a while, although, I cannot remember taking photos with it yet--and that is always more critical.
Any ideas?
Alex
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