Have you disassembled a Packard shutter?
https://packardshutter.com
I have very old used ones, that work perfectly, some dated from WWII inside by inspections and simple cleaning.
Not trying to discourage you at all, but you need to know the competition.
Tin Can
Speechless, 3D artist and mechanical engineer? This is too good to answer so quickly, I am thinking in the potential for the future. Marriage of new technology with an old one. I presume it is only one speed, correct? How do you determine the speed before actually testing it?
"I have never in my life made music for money or fame. God walks out of the room when you are thinking about money." -- Quincy Jones
I don't know if it is a good idea, but I was thinking to add a sort of light trap to the blade, perhaps it may be a separate part that would be glued to the blade to allow an easier 3d print.Originally Posted by Phasma
One of the blades would have a different lip that would cover the central area, with the lip having a larger separation from the blade.
this is basically done in my design
http://recordit.co/hUlFcrIs23
so the blades are already overlapping... I thought about something similar to your design as well, but it has two downsides:
-added weight on those fast moving parts
-the extra thickness on only one side makes the construction impossible to move out of the way. in the moment the blades are closed it is also important to have no light leaking from behind (where the blades are mounted). In your construction they would need extra space to move away.. If closed this space would allow light to come through...
I am sure that there are a couple of possible ways around this but they would all include more material (for something like a housing for example) but this would also increase printing costs a lot
I payed 260€ for all of this.
regarding the Packard shutters... I saw them on ebay although the ones from within Germany were too small. I might be wrong here, but my intention to go 4 bladed was the camera shake when operating the shutter. with only two blades this seems tricky
Currently my shutter only supports bulb... meaning it can release as fast as you can pull the leaver :-) (might be 1/8th of a second? - I need to measure this...) however I mostly use Harman Direct Positive Paper @ISO1... unless it is super bright I will not have to realse it faster then some seconds... however I plan to rework the release completely using an arduino and a servo motor. (I also shoot film...).. although I also like the estetics of the bike breake, this will give me a lot more control over the shutter times :-)... or I just use a big nd Filter :-D
A few years ago I tried RC Servos from this supplier. https://www.pololu.com/category/205/servos
Too slow back then on a Packard. Air operated Packards vary speed by unit mass/inertia from 1/15 to 1/30. I had a metal blade model.
Tin Can
Great job!
“You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
― Alexander Den Heijer, Nothing You Don't Already Know
With just a solenoid and a timer you may press/release the shutter release cable, for accurate exposures.
Something like this (or a 12V one, for a single 12V batt)
https://www.ebay.es/itm/24V-Adjustab...g2g:rk:45:pf:0
The solenoid can be removed from any cheap (or cannibalized) fluid valve, this is $14.
This would be a control box that would be linked to the shutter with the release cable.
I experimented that with a broken shutter, I found that by placing an spring pulling the cable for a faster closing in B position then perhaps 1/30 could be achieved. When I brake another shutter because a DIY CLA I'll think seriously in that way
I am not too much into electronics and I really need to dig deep into this before continue developing, so thanks a lot for your help!
By using an standard timer you don't need to mess much with electronics, it's more about finding the right solenoid and drawing a convenient enclosure for the control box...
It's way more difficult what you have done yet...
Well done! This is a great idea and is especially good for use with very large lenses for which Packard Shutters are either not available or are too expensive.
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