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Graflex B cloth shutter

 
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Massimo M



Joined: 04 Apr 2015
Posts: 21
Location: Lavis- Italy

PostPosted: Mon Jun 15, 2015 1:10 pm    Post subject: Graflex B cloth shutter Reply with quote

Good evening

I recently bought a nice Graflex B-stationary 3 1/4x4 1/4, in good conditions except for the curtain that was detached and in bad, dry, cracked conditions.

I removed it and I cleaned the two spools in order to accept the new one I'm making.

Does anyone know about pre-tensioning of the lower spools' spiral spring? I need to reach an acceptable tension before refine it with the aid of a photocell instrument to measure the correct shutter speed.
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45PSS



Joined: 28 Sep 2001
Posts: 3639
Location: Mid Peninsula, Ca.

PostPosted: Mon Jun 15, 2015 6:30 pm    Post subject: Reply with quote

Curtain at full closed initial tension of 6 turns will work with an excellent spring. 8 to 12 turns is normal for most cameras. 16 or more turns there is a problem.
Curtain must close fully from O on tension 1 with the camera in any position.
Curtain must wind to smallest aperture/slot with the tension at 6.
Increasing the initial turns will have little effect on shutter speeds with a weak spring or worn roller bushings.
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Massimo M



Joined: 04 Apr 2015
Posts: 21
Location: Lavis- Italy

PostPosted: Mon Jun 22, 2015 11:41 am    Post subject: Reply with quote

Thanks.
At this time, I bought a curtain fabric in Japan, but I found it too "modern" for my Graflex, does anyone know what type of fabric is in the curtain and what paint they used in 1920s?
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45PSS



Joined: 28 Sep 2001
Posts: 3639
Location: Mid Peninsula, Ca.

PostPosted: Mon Jun 22, 2015 6:08 pm    Post subject: Reply with quote

Rubberized Silk or Cotton. Player Piano bellows cloth .008 inch thick is as close to factory original that is available today.
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Massimo M



Joined: 04 Apr 2015
Posts: 21
Location: Lavis- Italy

PostPosted: Thu Jul 02, 2015 7:44 am    Post subject: Reply with quote

Thank you
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