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Unitron 155 102mm

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#101 starman876

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Posted 19 November 2012 - 09:53 AM

Also, most of the mount boxes had the holder for the counterwieght covered with sheet metal so the counterweight could not break free through the wood and damage the mount.

#102 sgorton99

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Posted 19 November 2012 - 12:50 PM

Great looking mount box. Did he make that just form pictures or did the carpenter have some measurements to go by?


Thanks. A combination of pictures and using the mount itself for fitting and sizing. I'm leaning toward not varnishing - maybe just staining the outside. I also will be using felt to cushion the mount and under the weights. This box is really for storing, I will not be shipping the mount in it or anything like that.

#103 starman876

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Posted 19 November 2012 - 01:43 PM

I noticed the grain on the wood holding the counterweights is vertical. The grain should be going horizontal. The vertical way is the weakest way to build something to hold something heavy. Could very easily break along the grain should you put the box down hard accidently.

#104 sgorton99

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Posted 04 December 2012 - 07:35 AM

Dropped the base of the mount off yesterday at my local garage for painting (again). Now that it is post-deer hunting season in WI he should have more time! I promise to post pictures someday of the whole package back together...

#105 sgorton99

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Posted 14 January 2013 - 07:34 PM

My second or "back-up" Unitron lens arrived today, freshly cleaned from D&G Optical with new spacers (two were missing). Also making progress on painting the mount base, but need a tad warmer weather here before another coat of paint.

Impressed with D&G and the cleaning, just need to be patient as this took 2 months. Barry was able to get almost all of the white "ghosts" off. I can see coating losses from presumably prior poor cleanings, but overall very nice for a 50+ year old lens. Don't you love how the camera shows those tiny specs of dust?

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#106 Rich (RLTYS)

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Posted 15 January 2013 - 06:36 AM

Nice looking. :cool: :ooo:

Rich (RLTYS)

#107 starman876

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Posted 15 January 2013 - 11:10 AM

Nice looking lens. soon you will have more 4" scopes then you know what to do with. Maybe a binocular Unitron is in the future plans :cool: :cool:

#108 sgorton99

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Posted 15 January 2013 - 12:11 PM

Nice looking lens. soon you will have more 4" scopes then you know what to do with. Maybe a binocular Unitron is in the future plans :cool: :cool:


Thanks! I spoke with Barry at D&G this morning. He said the lens tested out very well. He did say there are a couple of residual spots he did not get off because he was afraid he would then have to refigure the lens with too much polishing. He prefers to keep the old Unitron lenses as original as possible if the quality is there. He also told me DON'T mess with the small screws in the front, just use the outside large screws for collimating.

#109 starman876

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Posted 15 January 2013 - 12:56 PM

Interesting you mention those small screws. I have found several Unitron that were not colimated properly. Maybe because the tube was not square with lens cell and focuser. You can make slight adjustments with those screws, but it is never enough. I am sure that Unitron quality in the begining made sure that everything was squared up, but in later years the adjustable cells became the norm.

#110 sgorton99

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Posted 24 January 2013 - 06:12 PM

Sent the original lens that came with this scope to Barry at D&G today. Now that I have a second lens back in my hands, felt safer sending this one off. There are some minor fungus issues (after being stored in a garage in St. Paul, MN for 15 years), so I really wanted Barry to do the cleaning for me. Sorry this has been so slow...

#111 sgorton99

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Posted 28 January 2013 - 07:33 PM

Still too cold here to spray paint the mount base (maybe tomorrow), so decided to take all the hardware off of the OTA and give it a nice clean up. I only used mild cleaner to get the grunge off, but what really made the big difference was a mild car wax. Not as good at detailing the picture history like PiSigma, but hopefully you get the idea.

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#112 Bill Griffith

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Posted 28 January 2013 - 10:09 PM

Steve,

I'm drooling over this instrument! Looks GREAT!!

I said it before,but worth stating again An original assy. of mount and OTA from the late 50's to early early 60's is pretty rare to find.

#113 sgorton99

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Posted 28 January 2013 - 10:14 PM

Thanks Bill, I'm really enjoying working on getting this scope up and running. Wish it was going faster, but I want to do it right (or at least the best I can).
Steve

#114 PiSigma

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Posted 29 January 2013 - 09:48 AM

Lookin' good Steve. I'll be interested to hear how the original lens turns out.

#115 sgorton99

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Posted 21 April 2013 - 08:49 AM

Finally making progress on painting the mount base with the weather slightly improving here in WI. 2 coats of primer and the first coat of satin black done. Now, trying to get the screws I need for the bubble levels and how they attach to the mount. Went to the hardware store yesterday, but that funny Unitron thread size is hard to find. Anyone know a source for these?

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#116 sgorton99

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Posted 21 April 2013 - 08:50 AM

Another

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#117 terraclarke

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Posted 21 April 2013 - 09:15 AM

Into the 1950s Japan, while metric had a different thread standard than Europe, so some of these old Japanese machine screws are very hard to replace with modern equivalents due to small variations in thread pitch and depth. Other possible sources for actual replacements of the screws might be folks who are restoring vintage Japanese motor cycles and bicycles, or WWII Japanese weaponry. Have you put a thread gage and micrometer on them?

#118 starman876

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Posted 21 April 2013 - 09:45 AM

Steve
Let me check my parts bin. If I have them I will send them to you. If all else fails you can get similar looking screws and tap new threads into the mount. I have been looking into making my mini mill into a CNC mill. It looks like the parts cost more than the mill cost me. However, it will enable me to make a lot of parts and also these very unsual threaded parts. I have so many different mounts and I was almost mystified how many different thread pitches I found even between the same model mounts.

#119 sgorton99

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Posted 21 April 2013 - 09:47 AM

Thanks Johann!

#120 terraclarke

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Posted 21 April 2013 - 10:02 AM

Speaking of nuts and bolts..... :flower:

#121 starman876

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Posted 21 April 2013 - 10:21 AM

Nuts, oh yeah. Oh wait, whats still in my wallet :shrug:

#122 Dave M

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Posted 21 April 2013 - 10:28 AM

Steve, looks like the scope is coming along, looking Great!

#123 Ron500E

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Posted 21 April 2013 - 01:53 PM

Steve:

Have you tried Metric and Multistandard Components Corp.?
They have both an amazing selection of those "hard to get" items and sell in small quantities. Large selection of different head sizes, pan, cheese, cross, etc.
I have been using them for decades and highly recommended them. They also have a selection British Thread items, BSW,BSF, BA etc.
Tools also.
www.metricmcc.com/

Kind Regards,

Ron

#124 terraclarke

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Posted 21 April 2013 - 04:35 PM

:4

:flower:

#125 sgorton99

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Posted 21 April 2013 - 04:49 PM

Patience Terra :)! Got another coat of paint on the mount today and worked on fabricating a missing "spring" which is part of the bubble level holder. The one on bottom is the original Unitron one. These are mostly covered up by the level itself.

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