Are there any other cem120 (non ec version here) users that may have had an issue where when the DEC is moving it often will make a thrashing/grinding sound?
Mines nearly there all the time.
Recently too, imaging in nina (asi294mc pro main, 60mm guidescope asi290mm mini and at f7), with good phd2 values or at least good considering my pixel scale, the image shifts up or down over time, despite rms of say 0.30-0.60 (though occasionally it briefly hits 0.80 then back down)
edit: i think my image shift is strictly in the RA axis possibly (i've verified RA is balanced, but is it possible i dont have enough counterweight despite balanced or some other factor)
Worth noting that my PA was done via sharpcap and it was supposedly good to 9" (excellent in the guide). If sharpcap cant be relied on and drift alignment in phd2 is the solution, i've not mastered that, perhaps a polar scope (ioptron sells one) can avoid dealing with phd2 drift alignment, if in fact this is a PA issue. I have everything tied down pretty well, things were fine previously and now they arent as far as i know.
I've since redone the wizard and calib in phd2 to be safe.
ioptron said that i should adjust the one (or two) meshing screws which i dont quite understand despite looking in the manual. So i tried a 1/8 counter clockwise turn on the larger one and this made no change to the sound.
They claim the sound is "normal", but given my recent moving image issues i'm not sure.
Thanks in advance
Edited by markm75c, 23 February 2020 - 01:35 AM.