Atlas bearing kit
Posted 18 April 2009 - 11:48 AM
Posted 18 April 2009 - 03:59 PM
Posted 18 April 2009 - 06:28 PM
Posted 19 April 2009 - 12:31 PM
Posted 19 April 2009 - 03:11 PM
How difficult was the process of installing the kit? Also, did you see a significant difference in terms of your peak-to-peak PE? I'm just trying to see if I really want to tear my mount apart for this.
Installing the kit isn't hard, but it isn't easy either. I never measured the PE before or after. Though the mount does sound a lot better then it did before. The most important aspect of it, IMO, is the final adjustment of the gears.. Though, I have to get into mine again. My RA is a little tight. Either I didn't put enough grease on the ring gear or I fudged up somewhere. But it tracks good and the GoTo's are spot on. My guess is more lube...
Posted 19 April 2009 - 03:47 PM
Posted 19 April 2009 - 09:13 PM
There is one problem you need to be aware of. The ceramic bearings aren't quite the right size and they will rub against the cover screws. This is easily remedied as I've documented here:
I've notified Kelly of this problem and I expect something will be done about it. In the mean time you can easily address this problem with a self made spacer like I did.
I did measure PE before but haven't been able to do an 'after' yet. I don't expect miracles based on the general construction of the mount but maybe it helped a little.
Posted 19 April 2009 - 10:09 PM
Posted 19 April 2009 - 10:28 PM
For this same reason it's important to identify all sources of 'rubbing' or friction. That's how I found out about the bearings. The worm shafts didn't rotate smoothly after I screwed in the covers. I could feel them grind slightly. After I added the spacers they turned smoothly, as they should.
Similarly the setting circles can also cause friction. It's a rather odd construction that allows these aluminum rings to just slide between the fixed and moving parts of both axes when you just replaced the bearings with better ones. So I increased the spacing slightly which allows me to lift the setting circles to their highest position before fixing them. This eliminates friction. Every little bit helps, I hope.
Posted 20 April 2009 - 02:48 AM
Posted 20 April 2009 - 08:34 PM
Posted 20 April 2009 - 08:50 PM
...but when you consider that the initial cost of the Atlas combined with the cost to upgrade the bearings is still about half of what you would pay for a losmandy G-11
Purely monetarily speaking that is somewhat true.
But think about this. How come you never see anyone that has a before AND after Pec curve or detailed guiding results of the Atlas on these boards. Doesn't that make you think?
I have been down the road of upgrades and third party 'fixes' to existing mounts, quite a few times actually. And when it comes down to it, most end up being gimicks, bandaid fixes or otherwise just end up opening up new issues.
In order to keep my post from becoming 100% whining, I have to admit that I have been in contact with users and suppliers of Atlas bearing kits and related accessories. Aside from the external structural upgrades like Losmandy type saddles; so far I have not had any 'magic' news regarding their utility above and beyond stock. But im trying.
Posted 21 April 2009 - 02:24 AM
Posted 21 April 2009 - 11:02 AM
Posted 21 April 2009 - 12:58 PM
How come you never see anyone that has a before AND after Pec curve or detailed guiding results of the Atlas on these boards. Doesn't that make you think?]
Oh well, you might have missed some interesting threads
on the EQ6 and EQMOD forums where you could have read
about what you miss!
I've seen quit a lot of PE's before and after and it really
seems to make a lot of difference.
Of course, there are also users who have fun improving,
measuring and trying things.
It's all part of the hobby I think.
Posted 21 April 2009 - 01:03 PM
From what I've been reading, it's not bearings that contribute the most to PE, it's the worm gears. Has anyone replaced the Atlas worms with high precision units?
IMHO the main problem is the gear ratio, which introduces
phase shifting, making a decent PE-correction quit
Of course the gears must have as little runout as possible.
Here I post some image of an improvement I'm being busy
with still, but it works well for the moment.
Changed the 36 tooth transfer gear for a 47 tooth one and
also bearings in the transfer gear and stuff like that.