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Manual trip arm

 
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pfaffoto



Joined: 01 Oct 2020
Posts: 1
Location: Port Hueneme CA

PostPosted: Fri Oct 02, 2020 6:09 am    Post subject: Manual trip arm Reply with quote

Anybody have a Speed Graphic manual trip arm *******?
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Dan Fromm



Joined: 14 May 2001
Posts: 2085
Location: New Jersey

PostPosted: Fri Oct 02, 2020 2:42 pm    Post subject: Reply with quote

Sorry, I don't.

I b'lieve -- could be mistaken -- that the trip arms are somewhat shutter specific. Which shutter do you want to fire using the body release?
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alt.kafka



Joined: 16 Nov 2019
Posts: 8

PostPosted: Mon Sep 13, 2021 1:20 pm    Post subject: Reply with quote

Resurrecting this thread ...

I'm using a lens in a Copal 0 shutter on my Crown Graphic. The Copal is just barely too small for the shutter release to fit comfortably under the factory standard 3/4" trip arm. I can sort of finesse it get it to work, but then the shutter release doesn't return enough to be able to use the preview actuator. I could really use a 7/8"-1". I have my camera fully calibrated for rangefinder use, and it's the last little piece I need to really be able to use it conveniently as a press/event camera.

I've heard that the trip arms were available in different sizes, but AFAIK, these are scarce as hen's teeth. Has anyone jury-rigged up a substitute, maybe using off-the-shelf hardware? There has to be some way to do it.

I think I could also improve it if I take up some of the slack in the shutter pull cable. There just doesn't seem to be enough travel in the trip arm to trigger a Copal. Is that something that can be adjusted without major surgery?


Last edited by alt.kafka on Mon Sep 13, 2021 6:38 pm; edited 4 times in total
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45PSS



Joined: 28 Sep 2001
Posts: 4042
Location: Mid Peninsula, Ca.

PostPosted: Mon Sep 13, 2021 6:21 pm    Post subject: Reply with quote

Side RF service manual shows:
31102-P1 Arm-manual trip (#3 shutter)
31102-P2 Arm-manual trip (#2 shutter)
31102-P3 Arm-manual trip (#1 shutter)
Attaching parts
107-2-2C Screw-machine, 1/8 in. lg., #2-64, oval flilster head, slotted, steel, chrome plate.
The top RF service manual changes Arm to Clamp.

The shutter sizes are for Graphex shutters. A similar problem occurs with Synchro Compur shutters, insufficient arm movement to operate B and T, speeds operate.

Grind off those hens teeth, hone your machining skills and make a arm long enough then re engineer the body release for a longer travel movement or a quicker response from the body release.
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The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.
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alt.kafka



Joined: 16 Nov 2019
Posts: 8

PostPosted: Mon Sep 13, 2021 9:00 pm    Post subject: Reply with quote

The manual trip arm seems easy enough. It's just an L-shaped hinge with a screw to squeeze it tight onto the pull stick. I'll make one like this:

https://youtu.be/HozfxFLmQnc

I'm not sure yet what can be done to increase the travel. If I can get just enough motion with a longer trip arm, maybe I don't need to solve that problem.
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