Steve Chroma with Jason Lane are working on 35mm Mag shutter and a new lens for 3d printed camera
I can almost see the Magnetic Shutter!
We need 2 things
3D Printable or cardstock apertures
and a scalable SIMPLE Magnetic shutter
no springs or timers wanted
The magnet will trip the shutter at a known speed
Tin Can
The a tin can 120-film pinhole camera with film curved the wrong way had several magnetic shutters
I did not like it, so it went to the next user.
Do magnets not decay?
So do springs...Originally Posted by Conrad . Marvin
I was a Flutemaker and we used gold springs on our instruments. It seems to me that the company trying to use magnetic “springs” had trouble with the magnetic field and some of the keys would not stay down or would not come up.
Yet, Bell Telephone made “high speed” relays for their switch boards……..
Wouldn't a relay be an electromagnet of some sort? I don't think those would wear out.
Yes, I think that would be correct.
Best estimate for modern magnets would seem to be 1% loss of magnetism per 100 years.
https://mpimagnet.com/education-cent...ur-magnet-last
The major risk is that the ferrous material in proximity to the magnet would gain some magnetic properties and change the field behaviour (strength/timing/acceleration of the shutter)
.e.g. I have a little old speaker above my workbench which I attach screwdrivers to when i want the tip to become magnetic. If the screwdriver loses it's magnetism, some time with the speaker magnet will rebuild that magnetism.
Not a problem in relays since the range of motion is so small and time delay mostly irrelevant.
The ones that don't "wear out" tend to be rare earth magnets, not ferrous. I worry more about the little magnetic fields that store my data.
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