The Hole in the Trees Skybox
CPC1100, SXVR-H694, ASI120MM
Imaging automation by Sequence Generator Pro and FireCapture
Quote:Hi Brian,If you need any help with the bearing mod, just let us know. I did it about three years ago when my scope started having RA "excursions," and it's been absolutely fantastic ever since. I routinely get 20 minute exposures with HFRs of ~1.1 arsecs.As mentioned above, the only trick is to make sure you tighten the main nut just enough so that there is no rocking in the axis. Too tight and you'll get binding leading to RA elongation.Kevin
Quote:The only thing I did different is use a PTFE grease to lubricate the bearings that is safe for rubber, plastic and metals, designed for high pressure load bearing applications.
Quote:The bearings I bought are 440C stainless. If people have opinions, I'm listening
Quote:Quote:The bearings I bought are 440C stainless. If people have opinions, I'm listening I look forward to hear how this project works out for you.It worries me a bit that Celestron chose nylon bearings over steel bearings. Is it just as simple as nylon is cheaper, or could it be that wear can become an issue with steel bearings?Anyway, good luck with the project.
Quote:Brian, I hope I'm not too late. The description of what you found is word-for-word what I found in my CPC1100. Grease, a bit of grime, no flat spots, no fine sandpaper, etc. With my stainless steel bearings I tested both Superlube (grease) and oil, and found oil gave a bit better RA tracking. I think the viscosity of the grease is just a little too high. And the guys who originally came up with the bearing mod have been pretty adamant that you want oil, not grease.Kevin
More stuff than I need; Not as much as I want
(Main scope: CPC800/Mallincam Color Hyper Plus)
Mason & Hamlin BB 2140 mm (grand piano)
Westchester Amateur Astronomers
C14 XLT, CGE NexSTAR 11 GPS + 120ST APM/TMB 130/780, AT111EDT SW EQ5P (2" Tripod/20" Pier) XW's 3.5mm - 20mm, 28mm RG, TVZ 2-4 ES14mm/20mm 100° UWAN 28mm,Paragon 40mm, TV55, Meade 2X 2" TeleXtender TMB SMC 4mm-16mm, Pentax 0-18, CZJ 0-25 EarthWin PFS-DBSE, WO DuraBright, AP MaxBright TV Bino's Bino Sets X 2: UO H.D's ~ 5mm-18mm, TV Pl.(NJ's)7.4mm - 40mm 16T5's, 24mm Pans Canon 18X50 IS Pentax 7X35 (9.3°