Oil in the Blades:-(

[cweg]

Hi dear Friends,
in another Thread I wrote, that I fixed the Shutter of my KAS2, but it seems that this wasn't the truth:-( After a few days, thinking of the batterie-problem I noticed, that the Apertureblades don't open, when I use the Aperturering. Than I disassembled the KAS2 and found the Shutter and the Apertureblades are touched by a little penetraiting oil I used. The shutter works well, but the Apertureblades are fixed, not much but enough for stopping their function. Closing the blades is not the problem, but they're not opening when I change the Aperture. It needs only a very little impulse in the middle of the blades, with the fingertip and then they're opening for 80 to 100% but not all the time and not 100% correctly.

Does anybody of yours got a hint what to do? I have no idea to disassemble the shutter to get to the blades and dry them and I don't wanna destroy the shutter by a newbie error.

Thanks and best regards

CHristoph

 

[btgc]

I'd: keep shutter opened in B mode and clean aperture blades and carefully between then with lighter fluid using cheap painting brush (for kids) - great hint from comrade FallisPhoto.

Just look for synthetic brush (who knows what natural hair of animals will do when moistened in this liquid), remove excess of fluid by paper towel and gently (I really mean gently, as brush can harm those blades) reach between aperture blades. Wipe grease off blades with earsticks (with cotton buds).
I mix brush and wet/dry earsticks to remove as much oil as I can. When aperture starts opening/closing, just when you don't oil on blades after some openings/closures. You will easily see.

Brush helps to clean surfaces between blades, this is greatest thing about it (nocheinmal - carefully). Also allows to reach surface of blades hidden in shutter though be careful - excess fluid could migrate to helicoid.

 

[FallisPhoto]

I'd: keep shutter opened in B mode and clean aperture blades and carefully between then with lighter fluid using cheap painting brush (for kids) - great hint from comrade FallisPhoto.

Just look for synthetic brush (who knows what natural hair of animals will do when moistened in this liquid), remove excess of fluid by paper towel and gently (I really mean gently, as brush can harm those blades) reach between aperture blades. Wipe grease off blades with earsticks (with cotton buds).
I mix brush and wet/dry earsticks to remove as much oil as I can. When aperture starts opening/closing, just when you don't oil on blades after some openings/closures. You will easily see.

Brush helps to clean surfaces between blades, this is greatest thing about it (nocheinmal - carefully). Also allows to reach surface of blades hidden in shutter though be careful - excess fluid could migrate to helicoid.

The problem is not what naptha and such will do to the bristles, but what it will do to the glue that holds the bristles to the brush. It will dissolve some glues, and then you wind up picking hundreds of hairs out of the shutter with tweezers. I use the cheapest kind of brush I can find, with plastic handles and plastic bristles, because the bristles are melted onto the brush handle. This means they can't come loose. They would probably be lousy for painting, but they are great for things like cleaning shutters and applying contact cement.

Another thing you do not want to do with natural hair bristles is expose them to bleach. A short exposure will make them brittle and a long exposure will actually dissolve the hair. This will cause more shedding problems.

 

[cweg]

Thank you very much. It worked. I was lucky and found a brush with plastic bristles and cleaned the blades with lighter fluid the Brush and earsticks. After 20min the blades were dry and now they're working easily and 100%
Thanks to both of you again for your help.

best regards

Christoph

 

[btgc]

Nice that social networks work 😉 Experience shows that if cleaning weren't sufficient, after some time (days, week, or so) shutter will become lazy again. Or even stuck.

No problem - materials are cheap, and you have got courage working on camera yourself.

 

[FallisPhoto]

Thank you very much. It worked. I was lucky and found a brush with plastic bristles and cleaned the blades with lighter fluid the Brush and earsticks. After 20min the blades were dry and now they're working easily and 100%
Thanks to both of you again for your help.

best regards

Christoph

Good for you! You're welcome.