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Johnphoto
Tinkerer
Username: Johnphoto
Post Number: 22
Registered: 03-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, July 16, 2009 - 09:28 pm: | 
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Compound shutter running at high speed only, apparently because when assembled, lever B (at the 12 o'clock position) is wedged against surface A (the edge of the top cylinder), and does not move when the shutter is tripped. When the piston is removed, lever B moves as indicated by the yellow arrows.
It seems logical to think that the lever has been bent, and it should stick up into the hole in the side of the piston.
I'm hoping that before I try bending lever B upwards, someone familiar with these shutters can give me guidance.
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Johnphoto
Tinkerer
Username: Johnphoto
Post Number: 23
Registered: 03-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, July 28, 2009 - 09:26 pm: |
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I bent the lever up so it engages the piston, and all is well in the world. More or less. I was too enthusiastic in cleaning the piston; air can escape too easily, so it runs too fast...speeds range between 1/30 (1 sec setting) to 1/100 (1/200 setting). A little oil in the cylinder would no doubt slow it down but pehaps in an unpredictable way that would change over time. As it is, along with the T and B settings it is entirely usable in its intended use on a view camera, and the speeds it has now are repeatable and highly reliable. <br><br>The diagram from NatCam is helpful, but note that the cam c is shown flopped from its correct orientation.<br>  |
Nickon51
Tinkerer
Username: Nickon51
Post Number: 81
Registered: 05-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, July 29, 2009 - 12:44 am: |
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You have done well on that shutter. Bringing it back from the dead, so to speak. Congratulations.
Greg |
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