Archived posting to the Leica Users Group, 2002/04/27

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Subject: Re: [Leica] Film register problems for everyone?!
From: Javier Perez <summarex@yahoo.com>
Date: Sat, 27 Apr 2002 13:09:41 -0700 (PDT)

Let me ammend myself
Thermal cycking from freezing to room temp may
eventually cause some settling on the shims but the
castings are unaffected.
Javier

- --- Javier Perez <summarex@yahoo.com> wrote:
> Wow!
> It finally makes sense. That's why my IIIa is
> smaller
> than my IIIc. It's older!
> 
> The vulcanite shrinkage has no effect on register
> distance. Iron and aluminum blocks do "move around"
> but that's a result of thermal cycling, chamber
> pressure and cranking induced stresses, none of
> which
> happen in a camera. Outside of dropping, it
> sometimes
> happens that the camera doesn't come together
> exactly
> as it went apart after a CLA. That's why you are
> supposed to re-mike and if necessary re-shim the
> flange after every dissassembly. This was
> poarticularly common with the built up chassis A's.
> It's the same thing that happens when you pull the
> cam
> carriers on a 907! The aluminum shrinks.... 
> Javier
> 
> --- John Collier <jbcollier@shaw.ca> wrote:
> > I finding this all a bit much to believe. Iron and
> > aluminium castings 
> > contract significantly over time?! Seasoned engine
> > blocks are not any 
> > smaller than brand new ones. Certainly engines do
> > not seize up over time 
> > due to the cylinder diameter shrinking; even over
> a
> > hundred years! 
> > Seasoned engine blocks have been vibrated by
> > operation of the engine and 
> > this stress relieves the material of the block.
> That
> > is it and not 
> > something you want to do to your camera.
> > 
> > Can LTM Leicas have film register problems
> overtime?
> > Yes but it is due 
> > shrinkage of the cover material on the first
> bodies.
> > The lens mount is 
> > screwed onto the body sandwiching the cover
> > material. Owners notice that 
> > their lens flange has "loosened" and tighten the
> > screws which puts the 
> > mount out of proper register. This happened very
> > quickly with the 
> > special order leather finishes but very slowly
> with
> > the vulcanite 
> > material.
> > 
> > The most common cause of the mount being out of
> > register is from an 
> > impact.
> > 
> > John Collier
> > 
> > On Saturday, April 27, 2002, at 09:47 AM,
> > dante@umich.edu wrote:
> > 
> > >  Leica late LTM (IIIc and
> > > on) and M bodies contract over time, enough to
> > cause the body focus to
> > > change.
> > 
> > --
> > To unsubscribe, see
> http://mejac.palo-alto.ca.us/leica-users/unsub.html
> 
> 
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