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Adrian
Tinkerer
Username: Adrian
Post Number: 295
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 18, 2010 - 06:27 am: | 
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I've just been given one of these, seems to be the 1954 model with no automatic diaphragm, speeds below 1/25th, or self-returning mirror.
It's in good cosmetic shape but the shutter is not right at speeds below 1/100. The right-hand curtain does not spring back all the way across its opening when the shutter is released at B or 1/25th, and at 1/50th it seems to slow down as it reaches the end of its travel (sort of shutter capping in reverse). It does seem to improve with exercise, but I'm wondering whether there is a reasonably simple fix, or whether as it's in nice condition and has a bunch of accessories it's destined to be a shelf queen?
Your thoughts would be appreciated!
Many thanks,
Adrian |
Chris_sherlock
Tinkerer
Username: Chris_sherlock
Post Number: 18
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 19, 2010 - 09:12 pm: |
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G'day Adrian,
Three possible causes come to mind.
1.Dirt build-up and lack of lubrication.
2.Not enough curtain tension.
3.Curtains have dried out and hardened. Hardened curtains are very unenthusiastic about straightening out after spending a lot of time curled tightly round the roller.
Someone else might be able to gove more model-specific advice.
Regards, Chris |
Adrian
Tinkerer
Username: Adrian
Post Number: 296
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 20, 2010 - 03:59 am: |
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Cheers, Chris
Curtains seem fine hardness-wise, so I guess 1 or 2. It looks as though I'm not going to get the shutter crate out without going a lot deeper than I want to to check the tension (the RH curtain definitely seems to run out of tension - and I'm fairly certain that the crate comes out via the lens throat - eek!), so it may be a case of clean what I can reach, a tiny touch of Ronsonol on the moving parts I can reach, then hope. Especially hope!
Adrian |
Adrian
Tinkerer
Username: Adrian
Post Number: 297
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 20, 2010 - 03:57 pm: |
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Righty-ho, an update.
As suggested above, I've removed the film gate. I lifted the shutter curtains and/or tapes, depending on which bit I was fiddling with, with a cocktail stick and cleaned the bottom of the metal trim on the curtains with Ronsonol on a cotton bud. I also cleaned where they ran. I then dabbed the rollers that the curtains & tapes run on with a cotton bud (Q-Tip, for those across the pond) just barely moist with Ronsonol, and worked the shutter.
Result - 12 hours later, I still have a functional bulb setting, and the shutter speeds up as the indicated speeds go up. The curtain closes at all speeds. Hopefully that will keep happening, and I haven't just moved gunge elsewhere... |
Prasanna
Tinkerer
Username: Prasanna
Post Number: 48
Registered: 10-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 21, 2010 - 07:52 pm: |
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You may also want to lubricate the curtain roller spindles with a tiny drop of watch oil. That would make sure they don't get too dry, again. best, sp. |
Adrian
Tinkerer
Username: Adrian
Post Number: 298
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 24, 2010 - 04:23 am: |
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Thanks Prasanna, I wondered about doing that. After 12 hours or so, and with the shutter still working at all speeds, I very gently lubed the roller spindles I could get to with a miniscule amount of oil. Rick Oleson's TV test suggests that the speeds are still slower than advertised - I reckon about a stop, which should be fine with b&w - but faster than pre-lube. Thanks for giving me the confodence to have a go! |
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