Posted 26 June 2014 - 11:10 PM
It was posted on the eBay, Craigslist, etc thread. While it was in Houston, I live on the very north side of town and it was located on the very south side of town. That's like driving half way across Rhode Island.
I wasn't going to look at it because I have more scopes (or scope projects) than I need and little time to work on them because I'm working on buying a lot and building a house. But, Chuck kinda talked me into it. The photos were bad and the mirror was clearly in need of recoating. But... I always wanted an f/5 RV-6, and I knew about a set of f/5 C6-N optics that were available.
When I saw the scope it was much worse that I thought it would be. It's proof that Troglodytes exist, because one previously owned this scope. It was painted with God knows what. It looked almost like someone poured black paint on it. It had some nasty homemade wheels attached (at least they didn't destroy the nice moonlander feet). I cannot tell if the Dec shaft has been painted, is rusted, or both.
It was advertised for $80 with a cheap 10mm Orion EP. I offered $40 and he countered with $50. I'd have walked, but I had an hour drive each way, so if I came home empty-handed it would have been even worse.
When I got home I placed an ad for a finder and bought the f/5 C6-N optics.
Here we go....
- terraclarke, Bomber Bob and Charlespl like this
Posted 26 June 2014 - 11:15 PM
Posted 26 June 2014 - 11:21 PM
Posted 26 June 2014 - 11:22 PM
Motor is mid 74. Kind of cool as that is the summer after I started into all this.
Posted 26 June 2014 - 11:30 PM
Posted 26 June 2014 - 11:32 PM
Thankfully, give the system will be f/5, the nasty holes will be cut away.
Posted 26 June 2014 - 11:36 PM
I'm not sure what I'm going to do with it. Thought about selling it, but now I'm thihking of getting it recoated and donating it to my club for a raffle. Not sure about that yet though.
Posted 26 June 2014 - 11:38 PM
Hopefully tomorrow I'll have the optics.
Posted 26 June 2014 - 11:41 PM
Posted 27 June 2014 - 11:21 AM
You're a brave man, George! Should be fun.
Hehe. You know, it certainly looks ugly, but if I can get the portable media blaster to work reasonably well, it shouldn't be too bad since I have new optics on the way. I think the hardest part is going to be dealing with the Dec shaft. The rest turns out largely to be cleaning or stipping old paint and repainting.
The Dec shaft has me worried, especially since Gil has made comments to the effect that replacing the Dec shaft is brave. I'm currently thinking it may have to be replaced, but I'm going to try to salvage the original.
Posted 27 June 2014 - 12:43 PM
Btw, I thought those slip-on casters were a neat idea, even if executed less than perfectly...
Posted 27 June 2014 - 01:35 PM
...The rest turns out largely to be cleaning or stipping old paint and repainting.
I'm sure that you're already aware, but be careful when removing the paint from the Bakelite tube. Sanding will likely result in an uneven surface (a mistake I made many years ago when restoring a RV-8). Better to peal off the paint. Either way, it's a pain...but worth it.
Posted 27 June 2014 - 01:50 PM
The mirror surface actually looks unscathed. No scratches or etching or anything like that. Just missing lots of coating.
I was not aware of issues with removing the paint via sanding. I do have a nice random orbit sander that should minimize issues of unevenness, although I see your point. There is a RV-6 restoration gallery on Company 7's site where someone sanded it. I originally thought about hand sanding. I have some time to ponder it I think.
Found some possible solutions (pun intended) to remove the rust from the Dec shaft.
Posted 27 June 2014 - 09:04 PM
Posted 28 June 2014 - 09:53 AM
As you can see in the images that include the focuser, the brass is pretty tarnished to say the least. Pretty nasty actually. You can't even tell the tubes are brass. They are black. In fact, they were so bad, I thought perhaps they had been painted black with everything else.
Nope. Just severe tarnish. So badly so, I had a lot of trouble removing the draw tube from the main focuser tube.
I did some searching yesterday for removing tarnish from brass. I've used NevrDull to remove light tarnish in the past to great effect, but this stuff was well beyond NevrDull. The suggestions I found were ketchup, Worcestershire Sauce, lemon and salt,ammonia, and several acids I didn't feel like buying.
I started out with the ketchup. I smeared it on the brass and went to dinner. Came home and left it on overnight. Oops. Only supposed to leave it for about an hour. It took off some of the nastiness, but it was only a start (see the first pic - the focuser tube is after cleaning the ketchup). I washed the tubes and then tried the Worcestershire Sauce. The Worcestershire Sauce again helped a little, but at this rate it was going to take a LONG time. I looked for some ammonia, but we are out. My little monkey brain started thinking and I remembered we have some silver polish.
O... M... G...! The silver polish (and tarnish remover) worked like a charm! The tarnish was coming off quickly. Some of the really nasty spots took a lot of time, patience, and elbow grease, but it all came off, including a spot the size of a nickle that I doubted would ever come clean. It even removed the pink patina that is often left after cleaning brass. I thought I was going to have to leave the pink as patina, but... NOPE! I was able to clean the teeth cut in the focuser tube with a toothbrush and they turned out great too.
I highly recommend the silver polish and tarnish remover for cleaning tarnished brass. I can't wait to finish the focuser this weekend. I'm going to pick up some black wrinkle paint today and paint the body of the focuser and while I've had a little success cleaning the knobs, I am going to have to find something that will work better (probably with some mechanical help - chemical cleaning alone doesn't look like it's going to work).
Oh yeah, the f/5 C6-N optics arrived yesterday too. This rescue is starting to get exciting.
Posted 28 June 2014 - 09:54 AM
- terraclarke likes this
Posted 28 June 2014 - 09:55 AM
All told I spent about an hour cleaning up both this morning. Very effective.
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Posted 08 July 2014 - 10:05 PM
I've got half the primary sanding on the tube done. No pics yet (should have taken some tonight - oops). Following the spiral wraps as much as possible to avoid the unevenness I've been warned about. Been rolling the tube as I sand. Hopefully I'll have pics over the weekend.
The real update is the legs. I bought this:
It works about as I expected, which is to say, variable. Sometimes it's good and sometimes it's bad (the reviews are pretty accurate). I used aluminum oxide 70 grit on the legs. It made a mess in my driveway and I had to clean it with the pressure washer after. In the end I should have taken them to pro and paid for it. Probably wouldn't have cost any more.
Here's the legs (compare with them original pics). After blasting, they are a weird matte grey that looks, well, icky. The one in the rear is as blasted. The one in the front has been scrubbed with a Scotch-brite pad and cleaned with mineral spirits. The difference is more subtle in the pics, but you can see it. The scrubbed leg (closer) looks much more natural to my eyes. Ran out of time, so all legs are now devoid of paint, but only one has been scrubbed with the Scotch-brite.
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Posted 09 July 2014 - 08:02 PM
We were blessed with talented opticians, and a low-cost design. That goes a long way. Always has, always will.
Posted 09 July 2014 - 10:09 PM
Posted 10 July 2014 - 12:41 PM
For various reasons, I kept it, and I'm pretty sure there was no premeditated deception on the part of the seller, just a guy who didn't know much about telescopes. The rest of the mount actually looks better.
Posted 10 July 2014 - 01:01 PM
I may know of a source for that if you're going to replace it Fred.
Posted 10 July 2014 - 07:54 PM