CPC 9.25 TV 76, 102, NP 101 Unitron 114 Gibraltar mount Half Hitch Mk III SolarMax 90 .7A/B15 Coronado PST Eyepieces from the sublime to the ridiculous
Celestron CPC Deluxe HD 1100
Sky-Watcher Pro 120ED
Explore Scientific 82° 30mm, 18mm, 11mm, 6.7mm, 4.7mm
Canon T3i Baader mod, Hyperstar, IS-618CIU Camera
My Astro Gallery
Scopes: CPC8, TV85+Voyager Binos: 40-70mm, GT80mm~45deg
"We live in the sky, not under it." John Tyndall
Quote:I agree with Terry.
When I only heard the dreaded "clunks", I ignored them. Eventually œhowever, I could see the image in the eyepece move when I heard the sound so I figured it was time for a little detective work. I examined both the altitude and azimuth drives on my CPC 1100 and wound up backing off the worm assembly slightly. It removed about 99.5% of the problem. With the scope in some orientations I still here a knock once in a while, but nothing like before the adjustment. Plus the image in the eyepiece no longer moves even if the sound is there.
As far as the azimuth bearings, here's my experience. I have both a CPC 1100 and a CPC 800. From the first day, the 11 has been silky smooth in both altitude and azimuth. It's been installed in my observtory for over 3 years with temperatures swinging from near 100 to below zero.
I normally use the Hibernate function when I finish observing, but periodically realign the scope to maintain GOTO accuracy. To this day, the scope is still smooth as silk.
On the other hand, if my 800 sits for a day, it sounds like it has 'square bearings' when you rotate it manually. My solution has been to simply spin the scope around a few times. The 'clunk' sound goes away after a spin or two.
Both scopes have always had excellent GOTOs and tracking so I'm not convinced it's worth the effort to replace the stock bearings.