Nikon S curtain repair

[Proteus617]

Anyone out there willing to walk me through this? The lead curtain is swiss cheese. The ribbons look good as does the second curtain. Fast speeds time out fine. Slow speeds seems suspiciously similar and T acts like 1, but this can be user error as my model differs slightly from the manual on the Butkus site. I've removed the film gate and the bottom cover plate. thanks in advance,

-Matthew

 

[Proteus617]

OK. I replaced the curtain. It's securely attached to the metal lathe and the take-up drum. I'm a bit stumped as to how to proceed. I'm looking at a gear-shaped nut captured by set screw on it's perimeter. There is another screw at the center of the gear shaped nut. I assume the gear shaped nut adjusts the position of the drum in relation to it's internal spring and the screw at it's center adjusts the spring's tension?

 

[colyn]

OK. I replaced the curtain. It's securely attached to the metal lathe and the take-up drum. I'm a bit stumped as to how to proceed. I'm looking at a gear-shaped nut captured by set screw on it's perimeter. There is another screw at the center of the gear shaped nut. I assume the gear shaped nut adjusts the position of the drum in relation to it's internal spring and the screw at it's center adjusts the spring's tension?

This is the opening curtain which gets more tension than the closing curtain and which will determine shutter speed. On the Leica you end up with 6-7 turns but the Nikon will probably be different so I cannot comment. You'll need a shutter speed tester to get final shutter speed..

Adjustment is done by removing the set screw and turning the gear usually by way of the center screw you mention counterclockwise which will tension the curtain. You'll then have to replace the set screw to keep the tension.

 

[Proteus617]

Thanks Colyn, it makes more sense now. I have the shutter running again. No speed tester so I'm using Rick Oleson's method. I'll have to work out another way to sort out the slow speeds.

 

[colyn]

I'll have to work out another way to sort out the slow speeds.

The slow speeds are determined by a slow speed escapement gear. If you can find it and remove it an overnight soak in lighter fluid and a drop of oil on each pivot should get it back up and running.

Leica used a drum tester to set shutter speeds on the screw and M-series cameras. The below link gives you an idea how it worked..

http://www.skgrimes.com/idcc/index.htm