“I am the only person to ever ace a 1951 USAF resolution test. My 'to observe' list says 'done'. I do not use charts or atlases when I starhop; men do not use maps. One of my sketches won an SBIG deep sky imaging contest. I am the life of star parties I have never attended. I never say anything looks like a faint fuzzy - not even a faint fuzzy. Pilots aim green laser pointers at me. Don Pensack proofreads my CN forum posts.” - The Most Interesting Astronomer in the Universe
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Deep Space Products
Quote:So Ed, would you suggest that at the end of a session instead of homing the mount, a user should release the locks and push it to home so that different parts of the worm are being used every time?
Quote:Quote:So Ed, would you suggest that at the end of a session instead of homing the mount, a user should release the locks and push it to home so that different parts of the worm are being used every time? Not necessarily. If you are using PEC, then you want to be using the same parts of the gears. However, if you start experiencing problems like Jim and you are in a permanent installation or have not otherwise moved the mount, then releasing the clutches and changing the position so that you are on a different part of the worm wheel after getting tot he switch positions can tell you if you simply have a bad spot on the wheel that is causing a problem in a particular part of the sky. In general, the mount shouldn't really care what part of the sky it is pointed at, but shifts in balance or problems with the worm wheel may make it appear to have a problem like that. There are other possibilities of course, like a cord getting stuck at a certain position or something else getting caught when the mount is pointed in a certain direction, but those things are often more obvious. It's a matter of trying to narrow down what the problem might actually be.
Quote:Hi, I have a CGE mount and recently I have been noticing terrible noises when slewing to certain parts of the sky. It sounds like the gears tearing up or even bearings. My mount was stored when new and has just started being used early this year. I have a hard time believing my noises are bearings but If one was overtightened during assembly then it could be going bad. And I have heard of that happening.I decided to work on this today in the daylight in my shop. I have marks on my counterweight bar so I know where to place the weights when using my SCT setup. I tried slewing the mount and the noises started. So I decided to check the balance. Sure enough it was off balance. I remembered I had changed laser brackets and made a few other changes that were enough to mess up my balance. I rebalanced my mount and put new marks on my counterweight bar. Then I slewed my mount in all kinds of directions and the noise never came back. While slewing I placed my hand on the counterweight there was just a slight noise but it wasn't what I heard before. So I slewed in the other direction and there was that noise. I tried this in other locations and got the same results. It was just a case of being a little off balance. I got lucky this time. But it could have just as easily been a bearing. If it's a bearing Ed's good at fixing these.Neilson
Quote:I also saw on Celestron's support site that they were now recommending use of Klubertemp synthetic grease or Mobil 1 synthetic grease for relubing. Do you suppose that they've recently moved from petroleum greases to full synthetics?
John Hayes, Ph.D.
Adjunct Research Professor
College of Optical Sciences
University of Arizona
Quote:Quote:I also saw on Celestron's support site that they were now recommending use of Klubertemp synthetic grease or Mobil 1 synthetic grease for relubing. Do you suppose that they've recently moved from petroleum greases to full synthetics?Ed Byers recommends Lithium grease for his drives. So, yesterday (before I noticed this thread) I opened up my 2006 CGE mount and lubed all the gears with Lithium. Mobil One is thicker and might be a better idea, but it's hard to say. The synthetics operate over a wider temperature range and break down more slowly than the old petroleum based stuff. My gears looked pretty dry so anything is better than nothing. Clearly, if the mount is out of balance, the motors will have to drive a larger load and you may start to get significant wear over time. Balancing both axis will go a long way to making your mount last longer, point more accurately, and run quieter. If you use the mount regularly, re-lubing the gears on an annual basis is a good idea.Even though they are widely available I agree that the cat-5 cables were not the best choice. They at least need right angle connectors so that they aren't getting torn up during slewing. I've used velcro and wire-ties to strain relieve the cables on my mount.All and all, I have to agree with you guys that the CGE is a surprisingly good mount in spite its few "nits." When I first saw my C14 on the CGE, I thought that the mount looked a bit small for the size of the telescope. I've only had it for a few weeks, but so far, I've been quite impressed by it's stability, accuracy, and ease of use.John
Quote:John, did you simply loosen the four 2mm allen screws on each motor to gain access? Taking a peek at my gears is on my to-do list for weekend after next.- Jim
Quote:Okay, so I opened it up this morning and...The worm and big bronze gear have a neat and tidy coating of white lithium grease on them. This led me to poke around to try and figure out where the golden dino-oil on the white foam in the case for the mount head was coming from. On closer inspection it looks like there's a little bit of golden grease pooled in the corners of the housing that appear to have come from the teeth of the little silver-colored gear set (two identical gears) on the end of the motor and end of the worm assembly.The tooth-to-tooth contact is now bone-dry. My question is this - should there be grease on the teeth of these small gears? Also, if so, why would Celestron use two different kinds of grease in the motor train?Thanks!- Jim