| Author |
Message |
    
Paradoxbox
Tinkerer
Username: Paradoxbox
Post Number: 1
Registered: 03-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 13, 2012 - 06:10 am: | 
|
Sorry about the thread title typo.
Hi all, new to the site and new to camera repairs in general.
I picked up an old Rolleicord II with a non functioning compur shutter but otherwise in decent cosmetic condition and it came with a case.
I opened up the shutter and was able to get it to start firing but the times were all wrong.
After a little examination I discovered that the long coil of metal in the shutter escapement was broken.
It looks like I can salvage it simply by soldering/gluing/welding it back on to its spindle. But I don't know what tension it's supposed to be at.
There is also a little lever on the escapement that moves in and out whenever the shutter is triggered at medium/slow speeds - there's a spring controlling the force, with slots cut out to allow for varying spring resistance levels, how strong should the force be on that spring?
Anyway, most importantly, how can I reset the main escapement spring's tension? How tightly should it be coiled?
Here is a link to someone else's photograph who had the same problem as me. The broken spring looks like a solid brass disk in this picture - it's actually a thin strip of metal.
http://www.flickr.com/photos/kb2qqm/5957808769/
Any help appreciated, I'd like to get going with this camera! |
Paradoxbox
Tinkerer
Username: Paradoxbox
Post Number: 2
Registered: 03-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 13, 2012 - 06:57 am: |
|
Here's a clearer photo. The part that's broken is above the gear he's indicated in this photo.
http://farm5.static.flickr.com/4140/4773528712_0e9e6c620d_b.jpg
Any ideas on how to reset the tension on that? |
T6nn
Tinkerer
Username: T6nn
Post Number: 27
Registered: 06-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 13, 2012 - 02:55 pm: |
|
The tension of that hairspring should be just enough to return the gears back to the initial position. It doesn't have much to do with the timing, witch is mostly adjusted by the slight repositioning of the escapement itself inside the shutter.
All the repair manuals generallly don't recommend any repair attempts on these small escapements, but if you succeed soldering the spring together, try gradually increasing the tension, until the gears start returning reliably.
About repairing that spring: maybe a search in some wachmakers forum will give you a better answer? |
Paradoxbox
Tinkerer
Username: Paradoxbox
Post Number: 3
Registered: 03-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 13, 2012 - 03:05 pm: |
|
Thank you for your kind reply.
I have seen other people mention watchmakers so I think I'll see if I can find someone who's up to the task.
Otherwise I might try to make it myself - it looks to just be a piece of copper around 2 inches long.
I'm a little unsure as to how it's supposed to be fastened actually. Solder the inside of the coil to the gear post, solder the other end of the coil to..?
Perhaps there's an easier "hack" to do the same job of the spring but without actually using that spring at all..? |
Brcamera
Tinkerer
Username: Brcamera
Post Number: 163
Registered: 08-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 13, 2012 - 04:08 pm: |
|
If you have no luck with fabricating and installing a new spring (may not be a trivial task, depending on your skill level!) I do have many new old stock Compur parts including escapements available. You can PM me for info.
Thanks.
Bill |
Paradoxbox
Tinkerer
Username: Paradoxbox
Post Number: 4
Registered: 03-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 13, 2012 - 05:26 pm: |
|
Hi Bill, check your PM box. It would be a lot easier to just swap out the old escapement which was pretty rough anyway, for a new one.
James |
