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rtanton
Vendor (Explorer Scientific)
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Reged: 02/06/07

Loc: Mission Viejo, CA
Re: 125 ETX Focusing Problem new [Re: REC]
      #5828264 - 04/28/13 12:41 PM

Bob, a very important grease function is to minimize dreaded mirror shift...more so than lubricity. Too much lubricity can actually be a problem. While working at Meade, I had our guys try a silicone based lube containing PTFE. My thought was that a stable viscosity with temperature fluctuation combined with excellent lubricity would be a winning combination. I was wrong! Tests showed a very smooth focus: however, the lubricity was too much and the mirror refused to stay put when the scope was tilted upward...this was on a larger scope, but I would be concerned even on an LS.

Russ

Edited by rtanton (04/28/13 02:24 PM)


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Geo.
Carpal Tunnel
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Reged: 10/01/08

Loc: Upstate NY
Re: 125 ETX Focusing Problem new [Re: REC]
      #5828774 - 04/28/13 05:10 PM

Yes, I usually flock my tubes. The ETX is a lot easier than say a C11. Just thread off the tube and go to work. I usually pull the optics on a SCT to avoid any sticky situations.

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redlinedb16a
sage


Reged: 10/17/10

Re: 125 ETX Focusing Problem new [Re: REC]
      #5840059 - 05/04/13 12:35 PM

How did it go?

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REC
Post Laureate
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Reged: 10/20/10

Loc: NC
Re: 125 ETX Focusing Problem new [Re: redlinedb16a]
      #5840140 - 05/04/13 01:43 PM

I have not picked up the grease yet, have to order it. Will do that today. I did rack the focuser in and out a couple of times and it did help some, at least the target does not go out of the FOV!

Bob


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REC
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Reged: 10/20/10

Loc: NC
Re: 125 ETX Focusing Problem new [Re: REC]
      #5840145 - 05/04/13 01:45 PM

Redline, BTW I passed on your instructions to a guy at Meade I know and he said they were excellent directions! If he gets any questions from the field on this topic he will recommend your posts.

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redlinedb16a
sage


Reged: 10/17/10

Re: 125 ETX Focusing Problem new [Re: REC]
      #5846855 - 05/07/13 11:05 PM

Well that cool to know that my ablity to be fearless and tackle my issues can help others

If you have any questions let me know
Ill rip mine apart to get an answer if I have too


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REC
Post Laureate
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Reged: 10/20/10

Loc: NC
Re: 125 ETX Focusing Problem new [Re: redlinedb16a]
      #5901439 - 06/04/13 10:20 AM

Redline, finally stopped into an automotive store and picked up a tube of "AGS White Lithium Grease", some mentioned that as good too. How am I supposed to grease the shaft, fingers, wooden stick ect? And what is the best amount of cover I apply?

Thanks,

Bob


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orion61

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Reged: 10/20/07

Loc: Birthplace James T Kirk
Re: 125 ETX Focusing Problem new [Re: REC]
      #5901666 - 06/04/13 12:15 PM

When I service scopes I use White Lithum grease with a bit of synthetic Motor Oil mixed in. Super Lube and oil work nearly as well.
About 1/4 tsp white grease and 8 drops of oil work best.
If the grease is thick it grabs the baffle and causes it to drag causing the shift, If it is thinner it fills the space
but slides much easier.
I have been using this for over 24 years, I had tried just about every other Grease/combo, under the sun.
I was even able to rid my Meade 7"Maksutov of image shift with this. Before it would shift nearly twice Jupiters Disk!
Collimation is more stable now as well.


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REC
Post Laureate
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Reged: 10/20/10

Loc: NC
Re: 125 ETX Focusing Problem new [Re: orion61]
      #5903938 - 06/05/13 01:33 PM Attachment (21 downloads)

Orion, this is the grease I just bought. Does it have to be synthetic motor oil? Sounds like you have a ton of experience doing this.

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REC
Post Laureate
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Reged: 10/20/10

Loc: NC
Re: 125 ETX Focusing Problem new [Re: REC]
      #5914892 - 06/11/13 11:31 AM

Did anyone see this picture of the grease I bought, ready to lube the shaft, but want to double check with you guys first?

Thanks,

Bob


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redlinedb16a
sage


Reged: 10/17/10

Re: 125 ETX Focusing Problem new [Re: REC]
      #5928790 - 06/19/13 08:31 AM

I know some lithium grease if sits for awhile the oil separates from the grease
That's why on the tube instructions it says to kneed the tube before use

I have zero experience with the grease you have


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