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Screw retainer of shutter mechanism in Speed graphic

 
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zewrak



Joined: 25 Aug 2009
Posts: 7
Location: Sweden

PostPosted: Sun Jun 17, 2012 12:28 pm    Post subject: Screw retainer of shutter mechanism in Speed graphic Reply with quote

Hello,

I decided today to try to fix the shutter of my Speed graphic. When i disassembled the shutter mechanics, it turned out that the head of the retainer screw was almost completly lose from the screw. When I tried to losen the screw, it simply fell off.

So now my screw is lying here on the table in two parts. Is there anyone that know where I can get hold of a spare screw? I have no ways of measure the threads etc. Because the original is in really bad shape. But I got it out of there.

With a new screw, I am quite confident that the shutter will work like a charm.
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45PSS



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

PostPosted: Sun Jun 17, 2012 6:36 pm    Post subject: Reply with quote

We need a lot more information. Front shutter? Which one? as there were many. Rear shutter? which screw.
This service manual for the Top Rangefinder Speed and Crown Graphic
http://www.southbristolviews.com/pics/Graphic/manual-pdf/servicemanual.pdf
will work for the side rangefinder Speed and Crown also.
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zewrak



Joined: 25 Aug 2009
Posts: 7
Location: Sweden

PostPosted: Sun Jun 17, 2012 8:08 pm    Post subject: Reply with quote

Its part number 6 on page 3 in that manual for the focal plane shutter. Named "Screw-Retainer". It holds the retaining "washer" of the lower shutter curtain axle.
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45PSS



Joined: 28 Sep 2001
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PostPosted: Sun Jun 17, 2012 8:53 pm    Post subject: Reply with quote

That's figure 3 index 6 on manual page 3 (service instructions) or page 29 (Illustrated Parts Breakdown) which says screw-machine and the manual for the side RF says screw-machine special.

It was a special made screw but should be a standard SAE body/thread type.
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zewrak



Joined: 25 Aug 2009
Posts: 7
Location: Sweden

PostPosted: Sun Jun 17, 2012 9:04 pm    Post subject: Reply with quote

Indeed, part 30213P1

The kind of screw is called a shoulder screw and it is used to keep tension on the shutter axle, by holding the retainer in position.

I could most likely get it manufactured or get hold of a replacement, if i had any idea of the threads etc. But I don't any information about the thread and measurements would be appreciated. Or information about where I can buy a replacement.
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45PSS



Joined: 28 Sep 2001
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PostPosted: Sun Jun 17, 2012 9:13 pm    Post subject: Reply with quote

If you have a digital caliper then measure
1. the body diameter of the old screw or the opening in the plate where it goes
2. the number of peaks or valleys and length of the shaft
or the number of peaks or valleys in the plate where it goes and the thickness of the plate.

SAE screws are in thousands of an inch for diameter and threads per inch for the pitch.

With the measurements one can look up the measurements in a screw chart.
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zewrak



Joined: 25 Aug 2009
Posts: 7
Location: Sweden

PostPosted: Sun Jun 17, 2012 9:18 pm    Post subject: Reply with quote

45PSS wrote:
If you have a digital caliper then measure
1. the body diameter of the old screw or the opening in the plate where it goes
2. the number of peaks or valleys and length of the shaft
or the number of peaks or valleys in the plate where it goes and the thickness of the plate.

SAE screws are in thousands of an inch for diameter and threads per inch for the pitch.

With the measurements one can look up the measurements in a screw chart.


Aye, but as I said the screw is in really bad shape and hard to measure. And I cant measure the inside threads of the hole either. Had it been metric, I could have waltzed into any good machineshop and tried some screws out. But alas, all hardwarestores and shops around here use the metric system.

I'll try to come up with something. Or just bore a new hole and slap a M3 screw in there. But it's a shame to do permanent changes, since the camera is in really good shape. But rather one that works then one thats pretty and nonworking i guess.
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45PSS



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PostPosted: Sun Jun 17, 2012 9:28 pm    Post subject: Reply with quote

http://www.engineersedge.com/screw_threads_chart.htm
possible size is 2-56; 3-48 (rarely used); 4-40 and might be as big as a 5-40.
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