How to print a shutter

**Jac@stafford.net** · 12-Feb-2019, 14:23

Originally Posted by Phasma

this is basically done in my design

http://recordit.co/hUlFcrIs23

Attachment 187628

so the blades are already overlapping.

I cannot express how much I admire your design and CAD skills. That is an awfully large shutter to move and using springs to return it to closed is probably the best course of careful compromise. Four blades seems right.

Slightly overlapping leaves is all I know, but I'm an Olde Pharte. Can carbon fiber be laser cut? Is it opaque enough?

I'm stuck to this thead. Hugely interested.

**Pere Casals** · 12-Feb-2019, 14:26

Originally Posted by Jac@stafford.net

Can carbon fiber be laser cut?

Anyway it can be cut with waterjet

**Jac@stafford.net** · 12-Feb-2019, 14:38

Originally Posted by Pere Casals

Anyway it can be cut with waterjet

Another technology I know nothing of!

**Pere Casals** · 12-Feb-2019, 15:13

Originally Posted by Jac@stafford.net

Another technology I know nothing of!

It's a popular technology, here cutting Aircraft Windscreen Glass https://www.youtube.com/watch?v=eY-zQI7nr9c

It's a water jet at some 4000 Bar, that it takes an abrasive powder before reaching out material.

It's as usual, we pay and they cut. Not expensive... It can cut many materials: metals, rocks, plastic. I guess all clothes we are wearing have been cut in that way, they place many layers of fabric and the jet cuts that.

A benefit is that material is not reheated. It is used to cut aircraft wings from alluminium sheets, because material is not heated the sheet is not dilated while being cut, also holes for rivets have no crystaline changes in the hole boundary, so future cracks are not favoured.

**andrewch59** · 12-Feb-2019, 16:36

Its good to see some of the techo buffs of today coming up with new solutions to an old problem. I have a few old packards and an ilexpo shutter. Would certainly buy a newer more reliable version that doesnt stick quite so regularly (may be a good kickstarter project). Most of the time I use the highly technical Jim Galli shutter with my big lenses.

**Phasma** · 13-Feb-2019, 03:15

"Jim Galli shutter"

I looked it up - never heared of it - hilarious... also his description! - but if it works it works! In my case just covering the lens with something would have been enough as I rarely go below 1s - but this would have been too easy :-)

Also: I am not an engineer or CAD Person per se. I am a Computer graphics specialist when it comes to visualisation. I used visualisation tools to construct my shutter (so Polygon based instead of NURBS) and I would not recommend this unless you already know polygon modelling well. AND it is important to emphasize that there was a certain amount of luck involved here. I could not know the forces acting on the parts and If those rubber bands are enougth etc... that everything played out that nicely on the first try is not only based on skill ;-)