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Too much gooey mud on this focuser!

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15 replies to this topic

#1 jmillsbss

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Posted 26 March 2020 - 10:46 AM

Hey guys - So, I picked up the 120mm Meade Infinity frac back in December.  The 102mm @ f5.9 makes nice wide field views, and the views at medium and even high powers seem to hold together reasonably to very well for an entry level piece.  I've changed the mount to improve the balance and height at  near-zenith, (though I try not to spend too much time up there), upgraded the diagonal to a 1.25" dielectric mirror from Astro-Tech. (That one piece alone makes it a totally different scope!)  It removes the RACI function but I'm over it by now.  I also tried a RACI from Williams Optics but found the views are very much tighter with the AT mirror.  I'm watching out for a 5"-6" Mak-Cass (Synta?) and the 45 degree WO prism will be perfect for that...

 

The gripe I have is in the topic line of the post.  They've greased the focuser with some form of goo, a compound that's somewhere between Big League Chew bubble gum and tree sap mixed with horse snot!  If you reach for the focuser and miss the knob and find yourself bumping the focus tube, you get the aforementioned goo on your hand that gets transferred to your focuser knob, then to your face, then your jacket, then the eyepiece case and God only knows where else!

 

What can I do?  Disassemble the focuser and remove the concoction with some solvent like gasoline or ether?  Perhaps sand-blasting? (kidding) Then what do I want to use to re-grease the rack?  I feel like this is gonna get bad before it gets worse then maybe, just maybe, it gets better....

 

Thanks for the help!      J


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#2 junomike

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Posted 26 March 2020 - 11:33 AM

Here



#3 MarkGregory

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Posted 26 March 2020 - 12:06 PM

Hey guys - So, I picked up the 120mm Meade Infinity frac back in December.  The 102mm @ f5.9 makes nice wide field views, and the views at medium and even high powers seem to hold together reasonably to very well for an entry level piece.  I've changed the mount to improve the balance and height at  near-zenith, (though I try not to spend too much time up there), upgraded the diagonal to a 1.25" dielectric mirror from Astro-Tech. (That one piece alone makes it a totally different scope!)  It removes the RACI function but I'm over it by now.  I also tried a RACI from Williams Optics but found the views are very much tighter with the AT mirror.  I'm watching out for a 5"-6" Mak-Cass (Synta?) and the 45 degree WO prism will be perfect for that...

 

The gripe I have is in the topic line of the post.  They've greased the focuser with some form of goo, a compound that's somewhere between Big League Chew bubble gum and tree sap mixed with horse snot!  If you reach for the focuser and miss the knob and find yourself bumping the focus tube, you get the aforementioned goo on your hand that gets transferred to your focuser knob, then to your face, then your jacket, then the eyepiece case and God only knows where else!

 

What can I do?  Disassemble the focuser and remove the concoction with some solvent like gasoline or ether?  Perhaps sand-blasting? (kidding) Then what do I want to use to re-grease the rack?  I feel like this is gonna get bad before it gets worse then maybe, just maybe, it gets better....

 

Thanks for the help!      J

Tree sap and horse snot. Now, that’s a heck of a description.  


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#4 jmillsbss

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Posted 26 March 2020 - 12:10 PM

Southern climate.  Gets hot here June-September.  Want to use something that's stable.  However, the scope's in the house most of the time and the nights are generally cooler.  What about the removal of whatever this is they've got on it now?


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#5 jmillsbss

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Posted 26 March 2020 - 02:08 PM

Tree sap and horse snot. Now, that’s a heck of a description.  

Yeah, I ran out of creative descriptors.  It's just that bad.


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#6 MarkGregory

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Posted 26 March 2020 - 02:31 PM

Yeah, I ran out of creative descriptors.  It's just that bad.

Well, you made me laugh out loud.  I love when that happens  because it doesn’t happen that often.



#7 Kim K

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Posted 26 March 2020 - 02:39 PM

You can certainly disassemble the focuser and and remove the factory stuff, but being thick (per your humorous description) it serves to take up mechanical slop in the mechanism.  Save as much as you can as it may come in handy later.

 

Kim


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#8 Esso2112

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Posted 26 March 2020 - 03:07 PM

I’ve had good success with Goo B Gone to remove old grease. 


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#9 Berny

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Posted 26 March 2020 - 03:32 PM

I ran across something very similar to that in a tool-crib at Douglas Aircraft in the late 70's. It was labeled anti backlash grease.


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#10 SteveG

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Posted 26 March 2020 - 04:07 PM

Southern climate.  Gets hot here June-September.  Want to use something that's stable.  However, the scope's in the house most of the time and the nights are generally cooler.  What about the removal of whatever this is they've got on it now?

You can use any solvent that will work. I usually use paint thinner, or lacquer thinner.

For the grease, regular automotive wheel bearing grease.


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#11 daquad

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Posted 02 April 2020 - 12:38 PM

You can use any solvent that will work. I usually use paint thinner, or lacquer thinner.

For the grease, regular automotive wheel bearing grease.

Lacquer thinner for sure.  Use rubber gloves and several rags.  Don't get the lacquer thinner on painted surfaces. 

 

Super glue works well.  I use it on my 2" Chinese focuser.  There should be some grub screws on the body of the focuser to adjust the tension after reassembly.

 

Dom Q.

 

Edit:  I used lacquer thinner on my Losmandy GM100 mount to clean the grease that had hardened after 20 years.  Cleaned all bearings and shafts and then lubed with super glue.  The mount works better than when new.


Edited by daquad, 02 April 2020 - 12:42 PM.

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#12 jmillsbss

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Posted 03 April 2020 - 11:24 PM

You can certainly disassemble the focuser and and remove the factory stuff, but being thick (per your humorous description) it serves to take up mechanical slop in the mechanism.  Save as much as you can as it may come in handy later.

 

Kim

Mechanical slop stopper...that's gotta be why they used this crap!  I've ordered a GSO Crayford because when I got this one removed and broken down, it was clear all the moving parts were made using at least 3 totally isolated factories to manufacture by 3 different sets of plans!  Certified CRAP!  Can't reinstall it now that I know it's such a piece of junk!  Definitely the weak link!



#13 jp071848

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Posted 04 April 2020 - 07:53 AM

Lacquer thinner for sure.  Use rubber gloves and several rags.  Don't get the lacquer thinner on painted surfaces. 

 

Super glue works well.  I use it on my 2" Chinese focuser.  There should be some grub screws on the body of the focuser to adjust the tension after reassembly.

 

Dom Q.

 

Edit:  I used lacquer thinner on my Losmandy GM100 mount to clean the grease that had hardened after 20 years.  Cleaned all bearings and shafts and then lubed with super glue.  The mount works better than when new.

We do hope you mean SuperLUBE? ;o)  It's a great product.
 



#14 daquad

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Posted 04 April 2020 - 12:27 PM

We do hope you mean SuperLUBE? ;o)  It's a great product.
 

Oh my lord, yes.  What was I thinking?  Thanks for catching that.  At least I got 3 out of 4 letters correct.  lol.gif 

 

Dom Q.


Edited by daquad, 04 April 2020 - 12:32 PM.

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#15 m9x18

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Posted 04 April 2020 - 11:43 PM

I WAS kind of wondering about the super glue thing. Although I'm sure it would have taken ALL the slop out of the focuser's travel. In fact, I'm pretty sure it would have taken all the travel out too!   Hee hee!   ; b 


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#16 jmillsbss

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Posted 08 April 2020 - 10:25 AM

Oh my lord, yes.  What was I thinking?  Thanks for catching that.  At least I got 3 out of 4 letters correct.  lol.gif

 

Dom Q.

Yeah, I was thrilled that the slop was gone from the focuser, but now I have to stand about 75' behind the eyepiece to achieve focus, since using super glue to lube the action.  What gets off the super glue?!?!?!


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