At least the upper roll has the shim. Its free but I think
was stuck to the roller. Some speeds are pretty close now. I may
open the thing up again later. Thanks for the hints your
experience is valuable. Most people don't even know what I am
talking about.
On 4/26/2020 10:02 PM, Tox wrote:
What I found when I did mine 20 years ago was that I had to make sure
the washer like shims on the ends of the rolls were free and smooth (
mine had welded to the ends of the rollers by old lube and dirt), and
then hit them with sewing-machine oil. Once I did that, getting the
curtain tension roughly right for a 1/60, and taking a pic of my tv
snow with some type55 and counting scan lines made up for lack of a
proper shutter tester. Called it good at +/-5%.
The way the spring works, if you can nail one speed, the rest should
map pretty close to the spec curve.
Good luck!
Scott
On Sun, Apr 26, 2020 at 3:54 PM `Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
I think I said something about this here. Not quite OT. I
have been working on an Anniversary series Speed Graphic, trying
to make the focal plane shutter speeds match the chart on the
side better. I have a military service manual with a reasonable
amount of information in it as a guide. I have worked on these
before.
The results of several days of poking at it is that I have
probably got it about back to where I started. It works OK but if
I used it I will make a calibration chart rather than to use the
speeds listed. While I didn't make it much better I did learn a
lot about the construction of the shutter.
What is not explained in the book, and I can't quite figure
out, is how to wind the main spring other than unscrewing the
tension adjuster and rotating the whole thing. I want to be able
to move the tension up less than a full turn. The book mentions a
winder or wrench but it may be referring to the Pacemaker
shutter, which is quite different. I have, buried away in
storage, some older books which might (or might not) have more
info. Can't find anything on the web. I searched for Folmer and
Graflex patents and found a bunch going back to about 1910. The
shutter is simple, almost crude, but very rugged and reliable.
FWIW, this is one of four SGs I have, a late Anniversary with a
chrome speed chart. It has been modified with a Graflok back. The
lens is an early, uncoated, Kodak Ektar, in Supermatic shutter
with a solenoid synchronizer. It is a remarkably sharp lens. Very
early serial number. Its authentic for the camera but not for
age, the camera being newer. I can not find any serial number on
this camera, maybe someone knows where Graflex buried the serial
numbers.
I was introduced to Speed Graphics by a high school teacher
who was a part time press photographer. Showed me ho to use it as
a camera and weapon. A favorite camera.
Anyway, it gave me something to do for a couple of days.
--
Richard Knoppow
dickburk@xxxxxxxxxxxxx
WB6KBL
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