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Questar Standard Restoration - advice?

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78 replies to this topic

#26 Gregory Gross

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Posted 13 June 2019 - 01:04 PM

I received the fork today.
The slo motions work fine .
the knob on the fork opposite the fine motion appears frozen, is that not a lock? If so it is locked open. I don't want to force it till I talk to you guys.
See pic of inside engagement

Check out my earlier thread entitled "Loosening a Frozen Declination Brake" for tips on how I freed up the declination brake on my Questar. To do the jam nut technique of loosening a screw from the threaded side, you'll need 8-36 nuts (I got them from Grainger), not the more standard 8-32 nuts that one typically sees at the local hardware store.
 
Remember that the tightening and loosening motions on that brake knob are opposite from what you'd expect: tightening requires a counterclockwise turn, and loosening a clockwise turn. So if you're trying to engage the lock using jam nuts threaded onto the brake screw, you'll need to apply counterclockwise force using the nut on the inside part of the screw.
 
If you haven't already done so, verify what type of wrench you'll need to remove the set screw (either Bristol or Allen -- see this recent CN post of mine). And, as Optics Patent notes, make sure the screw is seated against the flat when you reattach the knob.

#27 dougspeterson

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Posted 13 June 2019 - 06:50 PM

Wow its all there in the links and the two hop rule. Thanks, parts ordered.

 

The label residue: it is dried out, about half removed without damage to the base finish.

What do you folks recommend?



#28 Gregory Gross

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Posted 13 June 2019 - 07:25 PM

With regard to that residue, have you tried something like 70% isopropyl alcohol? That’s probably what I’d try so long as the surface you’re trying to clean is not painted and is instead bare metal.

 

Isopropyl alcohol will surely mar painted surfaces like the inside side arms, so use caution.

 

To be sure, I have never attempted to clean that surface, and I have no experience with this. Take it easy and maybe try a more inconspicuous spot before really attacking that residue.

 

Does anyone have any other more informed advice?


Edited by Gregory Gross, 13 June 2019 - 07:28 PM.


#29 dougspeterson

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Posted 13 June 2019 - 07:34 PM

The surface contaminated brown residue just above the red circle. Not sure if painted, plated, polished.

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#30 Gregory Gross

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Posted 13 June 2019 - 07:44 PM

Would you be able to take another picture of that problem area in better light? It’s hard to see with that shadow covering that spot.

#31 dougspeterson

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Posted 13 June 2019 - 08:31 PM

Midnight or in the morning, a closeup, when I get home.

 

The left side still almost legible label glued on, dried out. Fading to the right, someone has gotten the label off but adhesive remains. Looks like they got 50% and without damaging the surface.


Edited by dougspeterson, 13 June 2019 - 10:11 PM.


#32 dougspeterson

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Posted 14 June 2019 - 02:54 AM

Closeups

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#33 Optics Patent

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Posted 14 June 2019 - 08:43 AM

Anything more than soap and water can damage Questar silver paint.  I use grain alcohol and it will damage that glossy clear coat.  It's not a tough coating like powder coat.

Overnight soak is where I'd start.



#34 munirocks

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Posted 15 June 2019 - 09:35 AM

If it's still gummy then before trying a solvent you could try to pull it off with gaffer's tape. Stick on, pull off, repeat. 



#35 RMay

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Posted 15 June 2019 - 11:01 AM

Goo Gone in small amounts?

#36 Optics Patent

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Posted 15 June 2019 - 12:52 PM

Test in an inconspicuous place...
...such as on a friend’s scope!
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#37 Gregory Gross

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Posted 15 June 2019 - 02:11 PM

On my '62 Q, that bottom part of the fork assembly looks like bare aluminum to my eye. But the photos posted on this thread appear to show that that part is painted. If this is correct, I would definitely be very reluctant to use any kind of solvent more aggressive than water.

 

I'm curious: when did this change from bare metal to painted metal happen? As an aside, I'd like to know why Questar thought to paint *any* of the exposed aluminum to begin with.



#38 Optics Patent

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Posted 15 June 2019 - 02:42 PM

Yes, it did change.  When? and Why? are more challenging.

I imagine that when dealing with aluminum castings, paint hides the imperfections well including pits that are found in quality castings - my Q7 restoration involved badly failed paint at the turntable face, and I ended up sanding it flat, and concentrically brushing to simulate machine turning marks - it shows significant casting pits.  In the modern era, a CNC machined structure from billet is normal and paint isn't a concern.  The earliest models even had bare aluminum control boxes.

 

My unrestored 1973 nearby has a bare metal turntable.



#39 dougspeterson

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Posted 17 June 2019 - 02:57 AM

Taking the safest path, soap and water and a rag doing the trick....


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#40 Gregory Gross

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Posted 17 June 2019 - 01:04 PM

Sounds like soap, water, and a rag is doing the job. Let us know how the goop removal turns out in the end.



#41 dougspeterson

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Posted 17 June 2019 - 09:34 PM

I am using liquid soap smeared on overnite. Gentle rubbing wet rag while watching the news. So far modest reduction in area covered w no sign of deterioration to the paint. Several days of this treatment will likely be required but I am in no hurry, I watch a lot of Fox news.

 

Meanwhile nuts and tools arrived to fix the frozen dec knob, and Ben's screws arrived to mate tube and fork wings. (Thanks Ben!)  At that point should I get tube rotation?

 

I have not talked yet to Questar about the baseplate. The gentleman who has sourced me these parts so far from his late father's collection may be taking a deeper dive into a storage unit in search off more parts, including a possible case, which could be full of goodies like legs, solar filter, etc , but no certainties here.


Edited by dougspeterson, 17 June 2019 - 09:38 PM.

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#42 dougspeterson

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Posted 17 June 2019 - 09:44 PM

The good news about this project, in addition to good prices for project pieces, is that the optical tube displays the usual superb optical quality,  perfect correction and superb smoothness on the star test at 200x. I expect that, having measured interferometricaly countless scopes, then comparing to the star test, the residual might be below 1/10 wave.



#43 dougspeterson

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Posted 18 June 2019 - 11:00 PM

I have a friend who swears by WD40 for everything including this application. Also says Goo gone has never damaged a delicate surface in his experience.


Edited by dougspeterson, 18 June 2019 - 11:02 PM.


#44 dougspeterson

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Posted 21 June 2019 - 12:24 PM

UPDATES

 

Photo shows soap and rag after a couple hours, about half gone, no damage.

 

The seller of the disassembled scope found more parts after a deepdive into storage unit, made me a deal on

—leather case (!)

—solar filter standard small, I really need a full aperture

— 3 legs

 

That leaves the baseplate. Incredibly Questar does not have a boneyard of leftover parts from upgrades, so for $28 I have a current production plate on the way.

 



#45 dougspeterson

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Posted 21 June 2019 - 12:25 PM

.

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#46 dougspeterson

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Posted 21 June 2019 - 06:38 PM

Case minor issue

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#47 dougspeterson

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Posted 21 June 2019 - 06:40 PM

Keys!

etc

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#48 dougspeterson

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Posted 21 June 2019 - 06:41 PM

End photos

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#49 cbwerner

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Posted 22 June 2019 - 11:09 AM

Looking good! Nice progress on the stain as well!



#50 Optics Patent

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Posted 22 June 2019 - 12:17 PM

That vinyl case is very repairable. You can find an illustrated thread I did on the subject


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