Mamiya 6 old folder frozen shutter

[Daniel Harbin]

Guys, you ought to see the gook coming from this shutter.  Still doesn't want to cooperate though.  Back to soaking.
 
Glenn, I knew that CCL4 was used in fire extinguishers.  When pointed at a flame, the CCL4 vaporized and replaced the O2 thus extinguishing the fire.
Didn't know that this property was the reason for the ban.  Boy, one would have to be crazy, knowing this, to be in a small, enclosed area using it.
 
Wayne, checked the Coleman fuel container and the contents are listed as "Coleman proprietry formulation".  I'm sure that it does contain the low bp. carbonyl groups.  Sure seems to me to dissolve the gook faster, evaporate faster, and as you say "cheaper" than lighter fluid.
 
mike kovacs, Hasselblad huh.  Sure will be one precision machine.  Am sure you know about the EU is building the world's largest Cyclotron underground, covering a bunch of sq. miles.  US was to build one in Texas but I think the cost killed it.
 
My PC is not starting up properly.  Dang, everything around here seems to falling apart.
Daniel

[Wayne]

 Am sure you know about the EU is building the world's largest Cyclotron underground, covering a bunch of sq. miles.  US was to build one in Texas but I think the cost killed it.

Is that the Large Hadron Collider at the Swiss CERN laboratories? Getting off topic now, but I meant to bring this up with Mike Kovacs when I saw a story about it on one of our science programs recently. Amazing statistics: cost 14 billion dollars, circular tunnel 27 kilometres long, 1200 superconductor magnets weighing 35 tonnes each (and cooled to -271 degrees C)...

[Mike Kovacs]

These big accelerators are not cyclotrons.

Thinking about the goop - are you soaking this shutter assembled?  You've got to take these things apart to do it right.  For one thing, there is supposed to be grease under the aperture selector ring.  Once the blades get solvent on them + gunk, they are very difficult to clean without properly disassembling the shutter.

[Daniel Harbin]

mike kovacs- Yes, I know you are suppose to remove the selector ring, etc. and greasing the ring, oiling the escapement, etc., the correct way.  However, I have read in other posts in different forums where shutters have been cleaned by soaking without a partial breakdown.  As I stated before, I know nothing about the Seikosha-rapid shutter and am reluctant to do so.  Have been unable to find any good detailed instructions or a repair manual.  Afraid of unanticipated differences.  Compur-rapid, even 1 Synchro-compur I have CLA'd and reassembled.  This is the first Seikosha for me.  If I don't succeed with this cleaning, I'll attempt to break it down....reluctantly.
On the EU accelerator- Should have stated cyclotron type of particle accelerator; ie- circular designed magnetic accelerator.  3 of us built a Wilson cloud chamber back in HS.  Won 1st place in S. Fair.  Was going to build a small Cyclotron (designed E O Lawrence), but couldn't scrough up the money to buy the parts back then.  Think I still have the plans,... somewhere.  It's 4:05AM.  going to bed.
Daniel

[Mike Kovacs]

No worries - took me 4 years to scrape up the $8.5M for our cyclotron