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#1 Matt Looby

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Posted 08 July 2019 - 09:03 AM

Ben-

 

Would you do a video on how to disassemble, regrease, and clean the 40x-80x and 80x-160x eyepieces?

 

Thanks,

 

Matt



#2 Optics Patent

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Posted 08 July 2019 - 12:48 PM

Interesting. From memory:
Remove rounded top eye ring by hand.
Loosen the three micro tiny set screws hidden in the grease.
Lift off the main outer collar, which has an eccentric inner flange that normally limits unscrewing. 

Unscrew the lens barrel. 

Clean  and degrease. I’m amazed that most of these from 60 years ago have grease that still works so I assume yours is rough or sticky. 

 

Knowing to look for the set screws is the only non intuitive part.

The Cutaway thread has this helpful image with the collar inexplicably elevated. 
https://www.cloudyni...63818-img-5447/

Removing all the elements is also realistic if you really need to. Keep track of orientation. 


Edited by Optics Patent, 08 July 2019 - 12:58 PM.


#3 Matt Looby

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Posted 08 July 2019 - 02:37 PM

Interesting. From memory:
Remove rounded top eye ring by hand.
Loosen the three micro tiny set screws hidden in the grease.
Lift off the main outer collar, which has an eccentric inner flange that normally limits unscrewing. 

Unscrew the lens barrel. 

Clean  and degrease. I’m amazed that most of these from 60 years ago have grease that still works so I assume yours is rough or sticky. 

 

Knowing to look for the set screws is the only non intuitive part.

The Cutaway thread has this helpful image with the collar inexplicably elevated. 
https://www.cloudyni...63818-img-5447/

Removing all the elements is also realistic if you really need to. Keep track of orientation. 

HEY!  There's my old eyepiece!  Thanks for you help



#4 Matt Looby

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Posted 08 July 2019 - 02:41 PM

Wow your skill is amazing- what a beautiful work of art.

 

A masterpiece by Ben Langlotz:

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#5 Matt Looby

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Posted 08 July 2019 - 02:45 PM

Ben-

 

What size micro screwdrivers are needed? 

 

One eyepiece seems to need grease or the retaining screws are tightened too far in as the eyepiece barrel focuser  is difficult to turn.  If the piece needs a regrease, what grease to you recommend for optics?

Thanks,

 

Mattis 


Edited by Matt Looby, 08 July 2019 - 05:10 PM.


#6 Optics Patent

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Posted 08 July 2019 - 06:58 PM

Matt I’m pretty sure I used one of the small ones in my Bergeron set I got when I had an interest in watchmaking. Embarrassingly expensive but they go down to 0.5mm wide. Any set that gets about that small should do. What I don’t like about the Bergeron is the flat wedge tip and not hollow ground like my Brownell sets (and like most cheap little sets of 6 in the plastic boxes for $10). Wedge tips aren’t ideal when much torque is needed and can damage slots. But at that size there isn’t much torque. And you'll never see a dinged slot again. 

 

I see some cheap sets on Amazon that go down to 0.8mm which might do it. You could also make your own bit from a sewing needle ground to a wedge. Or buy the Bergeron set with the ball bearing turret base and let your heirs fight over them many years from now. 


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#7 Matt Looby

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Posted 09 July 2019 - 12:20 AM

Ben-

 

Sorry to pester you, is there a type of grease I should use or do I just degrease and reassemble?

 

Thanks,

 

Matt



#8 Optics Patent

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Posted 09 July 2019 - 02:22 PM

The original grease is excellent but unknown. I use an optical helicoid grease that I’ve noted on a repair thread because it’s designed not to creep or emit anything that could cost optics. It’s also clean and white.

#9 Optics Patent

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Posted 09 July 2019 - 02:35 PM

By the way EBay looks like a good source for Bergeon (check spelling) used sets and cheap knockoffs.
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#10 Matt Looby

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Posted 09 July 2019 - 02:47 PM

I use a 1.0 mm flathead to unscrew those micro set screws-

 

Removed the flange, degreased,cleaned  added some oil, wiped off excess and cleaned the lens.

 

The housing screws together only one way, I had to mate the threads just so. 

 

The piece is as smooth as the day it was built.  Really just perfect for fine focus.

 

Thanks for the guidance. 

 

Matt


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#11 Optics Patent

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Posted 11 August 2019 - 10:04 PM

Looking back at this since vacation I now vaguely recall the multi start threads when reassembling. Are there four possible orientations? I don’t even recall what goes wrong when in the wrong position but do recall it being necessary to find the right one by trial and error (or carefully annotated disassembly).
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#12 munirocks

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Posted 12 August 2019 - 07:27 AM

Multi-threaded threads? Wow, that reminds me of an old Monty Python album that had two grooves on one side. What you heard depended on which groove the needle landed in.


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#13 Optics Patent

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Posted 12 August 2019 - 11:23 AM

Multi-threaded threads? Wow, that reminds me of an old Monty Python album that had two grooves on one side. What you heard depended on which groove the needle landed in.

Perfect analogy.

 

Multi-start threads are for application like this when one wants lots of axial travel for limited rotation.


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