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Synta Refractor Focuser Regreasing

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42 replies to this topic

#26 Jond105

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Posted 22 July 2018 - 07:10 PM

I believe that's a 1.5. But that's the size you'll need

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#27 AnthonyP

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Posted 28 July 2018 - 09:26 PM

Good job man. I've done all my synta scope focusers as well that same way(minus the tube). I hope you do a play by play with the cg4 as you did here. Diving into my one and only mount to de-synta-glue it makes me a little nervous

Well I did it. The CG-4 is now cleaned. Like you, I was nervous too. Let me tell you it wasn't that bad. I took photos along the way. On a scale of 1-10, I would consider re-greasing the focuser a 3 and re-greasing the CG-4 mount a 5 in difficulty. Go for it :)

 

https://www.cloudyni...st-as-possible/


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#28 sojourneyer

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Posted 06 April 2020 - 10:10 PM

Most excellent photos and step by step.   Do you do this for a living?

When you finish your project I will refer others to this link. 

Many are curious about re-lubing the focuser.

 

BTW that knob on the top of the focuser controls the friction on the draw tube.

If it is too tight, the focusing action will be rough.  If it is too loose, the focuser may

not stay where you leave it with a heavier eyepiece.  There is a butter zone.

 

There is also a butter zone for that plate that goes over the pinon gear too.

 

VT

This is the best Illustrated set of instructions I have come across on cloudy nights. Great job


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#29 AnthonyP

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Posted 16 April 2020 - 01:46 PM

This is the best Illustrated set of instructions I have come across on cloudy nights. Great job

Glad you found this  of service.



#30 chanrobi

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Posted 17 April 2020 - 02:07 PM

Thank you, I have a Skywatcher 102/F5 and I think this part of the telescope is exactly the same. I had a lot of trouble with smoothing focusing. Could not fine adjust. Slightly frustrating on planets I was trying to see.



#31 sojourneyer

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Posted 17 April 2020 - 02:58 PM

Thank you, I have a Skywatcher 102/F5 and I think this part of the telescope is exactly the same. I had a lot of trouble with smoothing focusing. Could not fine adjust. Slightly frustrating on planets I was trying to see.

I ended up purchasing a 2 "GSO crayford and you will not believe how much a difference it makes.

Suggest you look into it if you have the funds.   So easy to install.
 


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#32 chanrobi

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Posted 17 April 2020 - 03:41 PM

I ended up purchasing a 2 "GSO crayford and you will not believe how much a difference it makes.

Suggest you look into it if you have the funds.   So easy to install.
 

Looks very nice, however I think I will be upgrading my telescope at some point and I

don't want to upgrade this guy, unless you think it is really worth it? 

 

I bought my scope for $40 CAD.


Edited by chanrobi, 17 April 2020 - 03:42 PM.


#33 sojourneyer

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Posted 17 April 2020 - 03:58 PM

Looks very nice, however I think I will be upgrading my telescope at some point and I

don't want to upgrade this guy, unless you think it is really worth it? 

 

I bought my scope for $40 CAD.

Smart move..LOL



#34 AnthonyP

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Posted 21 April 2020 - 08:15 AM

I bought my scope for $40 CAD.

Please tell me you got a equatorial mount included in that price.



#35 chanrobi

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Posted 04 May 2020 - 01:56 AM

Please tell me you got a equatorial mount included in that price.

 

Unfortunately not, just the alt+az mount it came stock with. Lots of rusty bolt/nuts and missing slow motion control cables.

 

I just bough another $50 70mm Skywatcher refractor off craigslist and robbed all the good parts off it and it's now mint!



#36 donvegas

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Posted 13 July 2020 - 03:18 PM

Hi All

 

  I'm resurrecting this old thread.  I've done all of the steps in the posts including the set screw adjustments.  I'm having an issue about half way through the travel of the draw tube.  It gets rough for about 1/2 an inch.  I checked the teeth on the tube but see nothing that would cause the rough travel.  I've adjusted the 4 gear cover screws every which way to no avail.  Any suggestions?

 

Thanks



#37 sojourneyer

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Posted 22 July 2020 - 07:35 PM

What type of scope is it? If a very good one consider replacing with a nice crayford like focuser.



#38 sojourneyer

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Posted 22 July 2020 - 07:36 PM

Have you removed all the grease? Some of it is probably hardened. That is one such symptom.



#39 shawnmcarter

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Posted 24 July 2020 - 10:11 AM

I followed these steps on my ~20 year old Antares 127mm f6.8 scope and just wow. It's like a brand new telescope, well better than new because the focuser was always super thick and fine tuning the focus was impossible. I only put white lithium grease on the rack and pinion threads, ran the tube to both stops several times and wiped the excess grease off. Smooth and for a bonus I no longer get the 2mm change from parallel with the ota in the first couple of cm of travel.

#40 Book66

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Posted 15 August 2020 - 01:13 AM

I'm about to do this rebuild on my focuser too. Looks like all the same things I had in mind, and pretty much the same focuser I have. It came from Orion, but I see that several brands come from the same or nearly the same factory.

#41 sojourneyer

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Posted 21 November 2020 - 02:24 PM

The posts here recommend basically two recommendations for regreasing

a good Teflon/PTFE lubricant like Superlube and lithium grease.

 

My question is whether there are other options such as WD 40 and 3 in 1 oil lubricant?

Also which Superlube?

 

It would be nice to know your experiences.

 

Thanks


Edited by sojourneyer, 21 November 2020 - 02:26 PM.


#42 daquad

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Posted 23 November 2020 - 08:00 PM

The 2" Synta rack and pinion focuser on my Jaegers 4" f/15.5 refractor is buttery smooth.  I removed the pinion assembly and draw tube and built up the inside of the draw tube housing with strips of nylon strapping tape that I placed over the strips of nylon or teflon (I don't know which) that came with the focuser.  I kept adding layers of the strapping tape strips until there was no play in the focus tube while sliding it back and forth by hand.  That is, I was able to move the focus tube in and out with no wobble or play and some resistance to the longitudinal motion. I put a very thin layer of Superlube on each of the three strips, and then replaced and the pinion and adjusted the tension.  As I said, buttery smooth and only the slightest image shift at 200X.  Not bad for a $50 focuser.

 

Dom Q.


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#43 kksmith

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Posted 23 November 2020 - 11:27 PM

The posts here recommend basically two recommendations for regreasing

a good Teflon/PTFE lubricant like Superlube and lithium grease.

 

My question is whether there are other options such as WD 40 and 3 in 1 oil lubricant?

Also which Superlube?

 

It would be nice to know your experiences.

 

Thanks

Super Lube in the gray tube - "Super Lube Multi-Purpose Synthetic Grease with syncolon (PTFE)"

 

Grease stays in place, unless of course you have it on your hands. Oils roam and wander. WD-40 eventually dries and hardens. 

 

Ken


Edited by kksmith, 23 November 2020 - 11:27 PM.

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