SUBMARINEMUSEUMS.ORG

Welcome, Guest. Please login or register.
January 23, 2018, 06:57:27 PM

Login with username, password and session length
Search:     Advanced search
submarineshop.com" width="230" height="32
11072 Posts in 1378 Topics by 183 Members
Latest Member: Quirrely
* Home Help Search Calendar Personal Messages Members Login Register
+  SUBMARINEMUSEUMS.ORG Forum
|-+  General Boards
| |-+  Museum Submarine Discussion
| | |-+  Howto remove locking in TBT?
« previous next »
Pages: [1] Go Down Print
Author Topic: Howto remove locking in TBT?  (Read 2809 times)
drew
Seaman
*

Total BZs: 1
Offline Offline

Posts: 30



View Profile
« on: December 01, 2012, 05:16:18 PM »

One side of the Lionfish's Target Bearing Transmitter binoculars has had water in it for a long time. Decided it is time to fix it.

I have hit a snag in the disassembly required to get to one of the lenses that is so coated with crud you can't see through it.
There is a lock ring that needs to be removed to get at the optics. It is has about a a 3 3/4 inch O.D., and four slots 90 degrees apart for a lock ring wrench. I placed a screwdriver in one of the slots, and banged at it hoping to get the lock ring to turn, but no luck. If I bang too hard I will mangle the slots, which I don't want to do. I have also tried penetrating oil, but so far that hasn't helped. The threads are not rusty, so I don't think the ring is stuck because of corrosion.

Any idea where to get a wrench that might fit it? Or perhaps other ideas on how to get the ring to spin?

It is hard to see in the picture, but..
You can see what looks like a vertical pipe with a flange that has 6 holes. There are threads in the I.D. of that pipe. Follow the threads down into the pipe, the first object is the lock ring, it is about 3/8" tall. At about 45 degrees clockwise from due north is one of the notches for the wrench.
There is also a black lock ring that holds the lens in, that is isn't the lock ring or the lens that I am trying to get at. The lens that has the problem is at the eyeball end of the binoculars. The insides of the binoculars have to be removed to get at the inside side of that lens.

Thanx,
Drew


* IMG_1180.JPG (975.49 KB, 3264x2448 - viewed 300 times.)
Logged
Karen D.
Petty Officer 2nd Class
*

Total BZs: 11
Offline Offline

Posts: 180



View Profile WWW
« Reply #1 on: December 04, 2012, 05:25:56 PM »

We've done some work on our TBT's so I asked my vols. I only heard back from one so far. If others have ideas I will pass them on!

I myself would most likely build a tool to fit the notches if I couldn't find one.
 
I doubt if the threads are left handed but it wouldn't hurt to shock the ring 'tighter' first. Sometimes a slight movement tighter can assist to remove stubborn fasteners. I have done this many times.
 
Phil
Logged
Karen D.
Petty Officer 2nd Class
*

Total BZs: 11
Offline Offline

Posts: 180



View Profile WWW
« Reply #2 on: December 05, 2012, 09:52:01 AM »

I agree with Phil--use the right tool. You might check with the optics shop at a major base like Pearl Harbor.  If no luck there, make a tool.
 
Pat


Hope this helps!
Logged
Lance Dean
USS Drum Fan
Forum Administrator
*

Total BZs: 10
Offline Offline

Posts: 1534


John calls me "Gunner"


View Profile WWW
« Reply #3 on: December 05, 2012, 01:47:04 PM »

Thanks for coming in with a reply, Karen. I surely have no idea.
Logged

Karen D.
Petty Officer 2nd Class
*

Total BZs: 11
Offline Offline

Posts: 180



View Profile WWW
« Reply #4 on: December 05, 2012, 06:26:09 PM »

I didn't have a clue either, that's why I asked my experts! Smiley
Logged
pekelney
Petty Officer 2nd Class
*

Total BZs: 9
Offline Offline

Posts: 124


View Profile
« Reply #5 on: December 05, 2012, 07:37:43 PM »

You may find the following manual useful:
http://hnsa.org/doc/pdf/tbt.pdf

Also, you are looking for a spanner wrench.  You might get lucky on the size.  They also make adjustable spanners, but do not try to use a punch and hammer.  You really need a spanner to open this kind of locking ring without breaking anything or stripping the locking ring.

rich
« Last Edit: December 05, 2012, 07:42:23 PM by pekelney » Logged
drew
Seaman
*

Total BZs: 1
Offline Offline

Posts: 30



View Profile
« Reply #6 on: December 06, 2012, 10:17:57 PM »

Thanx for the suggestions
>> but do not try to use a punch and hammer
Since I already tried the punch and hammer, and it didn't work at all, I can see this is a good suggestion.  I was careful (liucky?) enough that I haven't broken anything.

Also, I got confused when reorienting the unit for a better grip, and accidentally tried tightening the ring. That didn't free it up either.

Finding or fabricating a wrench looks like the next step.

I looked for a manual and failed, so I appreciate showing me the one at HNSA. I guess the binoculars are called telescopes. The TBT manual references pamphlet 1398, which would cover telescope repair. If I had that pamphlet, maybe it would show a drawing of the wrench.

Drew
Logged
Paul Farace
USS Cod Volunteer
Chief Petty Officer
*

Total BZs: 12
Offline Offline

Posts: 572



View Profile
« Reply #7 on: December 16, 2012, 03:22:43 PM »

My best advice is not to try to do anything to the TBTs... about 30 years ago a vet with a high level of mechanical skill tried to fix this same problem... only to make matters far worse. This is like doing brain surgery on your kid. The TBT optics are nitrogen pressurized if I am not mistaken. We shipped ours off to a Navy optical shop several years ago and have checked on them routinely... (not happy about the time involved) and they are slooooooooooowwly being worked on (they say) when things get slow ... we can always trade time for moolaa.... (but this is pushing it ShockedHuh?  Really, unless you need to shoot torpedoes, waiting until the right person with the RIGHT TOOLS presents itself, is the best bet.  They may look simple, but trust me, unless the person is an expert in optics (good luck finding one of those this side of Germany, Japan, or Kollmorgen!) you're asking for pain down the road.  Try to cultivate a contact at a major Navy repair or civilian service center... maybe (not tried this myself) one of the camera repair facilities in the USA might want to tackle this as a goodwill project (Nikon, Canon)?
Logged

Johnny Cash's third cousin, twice removed
Pages: [1] Go Up Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2006-2007, Simple Machines Valid XHTML 1.0! Valid CSS!
USSVI LIB Restoration Supporter HNSA USSVWWII


Google last visited this page December 21, 2017, 01:52:44 AM