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Re: [Rollei] springs and tension

At 03:56 PM 11/02/2001 -0500, you wrote:
>At 02:35 PM 11/2/01 -0500, B. D. Colen wrote:
>>So Rollei Compur shutters should be left cocked then?
>That is what Deckel said.  I'm not certain that it is all that important,
>msmall    FAX:  +540/343-7315
>Cha robh bàs fir gun ghràs fir!
  Hassy shutters need to be stored cocked because the design of the camera
is such that they can't be interchanged when in the fired condition. Hassy
provides a key for cocking them off the shutter. I never saw a
recommendation for storing old style Compurs cocked.
  Springs mostly get weak from metal fatigue from much use. Most springs
will not change if simply left stretched or compressed, providing they are
not stressed beyond the elastic limit of the material. This seems counter
intuitive but is nontheless correct. 
  I would avoid storing old style Compur or Kodak Supermatic shutters with
the speed selector in the highest speed, whether cocked or not, because the
stressed booster spring puts a lot of pressure on some of the parts. 
  Rollei Automats often must be left cocked between shots. The self timer
is cocked with the first winding and stays cocked until used. Probably
stays cocked for years at a time on some cameras. 
- ----
Richard Knoppow
Los Angeles, CA, USA