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  #1  
Old 24-09-2007, 04:04 PM
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mill (Martin)
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R&D well spend :)

Well Ladies/Gentlemen i used the first day of my holiday well spend.
As you all know about the eq5,cg4 etc, the slop is horrible.
I have just found some small bearings that fit the wormwheel shaft perfectly
They are 6*10 stainless steel roller bearings, 3mm wide and perfect for the job.
The only thing i had to do was make the od bigger by means of rolling four bearings in electrical tape untill i had the right od of 11.3mm.
Those bearings are a very snug fit on the shaft and are showing no slop at all.
Just finished the ra side of my mount and i can say it is an great succes
The hollow nut that was used to tighten the shaft and compress the rubber "O" rings can be turned very tight now an i have no sideways movement at all.
After adjusting the ra axis the mount is very smooth and can be turned very easy without backlash (dependant on the age of the mount and gear assembly afcourse).
I will take photo's of my progress for the dec side of things and maybe this can go in the howto section.
Ill keep you all informed on my progress with photo's.
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  #2  
Old 24-09-2007, 05:36 PM
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mill (Martin)
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Some pics of the whole process.
Attached Thumbnails
Click for full-size image (bearing.jpg)
47.5 KB31 views
Click for full-size image (bearing1.JPG)
48.4 KB31 views
Click for full-size image (wormgear.jpg)
107.0 KB72 views
Click for full-size image (wormgearmodded.jpg)
114.5 KB68 views
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  #3  
Old 25-09-2007, 01:43 AM
Bill Bates
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Nice idea. Just watchout, without the 2 O rings theres no margin for error. If you accidentally bump the RA axis you will bend the teeth on the soft gear against the stainless worm. The O rings are a safety measure for this reason. Seeing your only tracking in one direction, does it matter if it has a bit of play? It's only a pain when manual slewing.
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  #4  
Old 25-09-2007, 07:44 AM
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mill (Martin)
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Hi Bill.
I made the mount so i can do autoguiding with it and the play that was there made it hard because of the lag when the gears go forwards or backwards.
Now the mount responds directly to the signals.
If i'm not tightning the levers too much and bump the ra axis it will just move and it will still track as long as the scope is well balanced.
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  #5  
Old 01-10-2007, 06:54 AM
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iceman (Mike)
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Hi all

Martin (mill) has written a how-to article to EQ5 Bearing Replacement.

You can read the article from the IceInSpace Projects & Articles page, or directly by clicking on the link below:

EQ5 Bearing Replacement

Thanks to Martin for writing the article. If you'd like to submit an article or review, please Contact Me.
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  #6  
Old 03-10-2007, 08:41 PM
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wasyoungonce (Brendan)
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This issue was also covered by another iceinspace user, serge in 2005, although he hasn't posted since Jan 07.

Have a look here:

http://www.iceinspace.com.au/forum/s...ead.php?t=4369

serge used similar bearings with bigger OD and bored out the worm shell housing to suit the bearings OD. Sweet.

This is an issue I'll be looking at on my EQ5.

edit:
Martin maybe we can compare musings..I"m in Lilydale just a hop skip and jump down the road.
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  #7  
Old 03-10-2007, 08:55 PM
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mill (Martin)
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Hi wasyoungonce.
Would love to compare musings.
I used these bearings so i didn't have to make any modifications just in case it went wrong.
It works really well.
Also modified the hand controller for autoguiding (just one cheap IC).
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  #8  
Old 14-12-2007, 10:40 PM
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dugnsuz (Doug)
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Hi martin,
As you know I decided to go ahead with your roller bearing mod on my Skywatcher Synscan EQ5. Ordered the required bearings from SKF in Adelaide, but they had to be ordered and I started to disassemble the mount for cleaning prior to doing the mod only to find that the worm gear in my mount already has roller bearings on the shafts!!! And they're 11.3mm in outer diameter!!!!!!
So this is just a heads up for owners of THIS model mount.
Cheers
Doug

Last edited by dugnsuz; 15-12-2007 at 12:57 AM.
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  #9  
Old 15-12-2007, 12:17 AM
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mill (Martin)
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You lucky bugger
Cancel the order quickly
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  #10  
Old 15-12-2007, 12:56 AM
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dugnsuz (Doug)
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Quote:
Originally Posted by mill View Post
You lucky bugger
Cancel the order quickly
Yeah Martin - came as quite a shock - where I expected to see rubber O rings were these beautiful roller bearings!!! I'll pass the bad news on to SKF tomorrow!
Doug
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  #11  
Old 15-12-2007, 09:40 AM
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leon
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Good one Doug, now look of at all that extra sleep you could have had, whilst worrying about dose roller bearings.

Leon
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  #12  
Old 31-01-2008, 01:29 PM
pjphilli (Peter)
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Hi All
I am having a bit of trouble specifying the exact bearing required to a supplier. Are there more details eg external diameter, shaft hole diameter, I see they are 3m wide. Best of all does anyone have a SKF or other type number?
Cheers Peter
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  #13  
Old 31-01-2008, 02:18 PM
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MrB (Simon)
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Quote:
Are there more details eg external diameter, shaft hole diameter, I see they are 3m wide.
See first post:
Quote:
They are 6*10 stainless steel roller bearings, 3mm wide and perfect for the job.
6mm ID x 10mm OD

and then:
Quote:
The only thing i had to do was make the od bigger by means of rolling four bearings in electrical tape untill i had the right od of 11.3mm.
I guess that means rolling all four, side-by-side, at once in tape then slicing them apart with a sharp blade.
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  #14  
Old 31-01-2008, 05:33 PM
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mill (Martin)
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Exactly as MrB said, very well explained
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