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Rotation mechanism Revolver pneumatic

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Rotation mechanism Revolver pneumatic

Unread postAuthor: Brain11 » Mon Jun 19, 2017 11:35 am

Hello from Germany!

My name is Thomas and i was reading already a while in the forum an the database and found some great ideas!!!

But for my own Project i have a Interesting question:

I want to build a fully pneumatic air cannon and one of my biggest problems is the revolver mechanism...

So maybe you can give me some tips how to move / rotate and lock the revolver drum in the right position only with one or more pneumatic cylinders

At the attached pics you cam see the actual construction...

I hope someone has a good idea!

Much greetings from germany
Thomas
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Re: Rotation mechanism Revolver pneumatic

Unread postAuthor: matti » Tue Jun 20, 2017 6:25 am

Welcome!

Solar here build a launcher called Eclipse, search it with the forum search and you will find lot of information about similar system.
http://eclipsedefense.com/products.html
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Re: Rotation mechanism Revolver pneumatic

Unread postAuthor: jackssmirkingrevenge » Wed Jun 21, 2017 5:52 am

Interesting project!

With regards to locking the drum in place for firing, the Crosman 38 might be of some inspiration:

Image

Part BB022 is pushed by spring CS686 and acts as a detent, partially entering the cylinder opening and temporarily locking it in place.

here's a conceptual integration with an air ram:

Image
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Re: Rotation mechanism Revolver pneumatic

Unread postAuthor: Brain11 » Wed Jun 21, 2017 2:33 pm

Hey guys,
Thank you for the answers!

The eclipse project lead me to the mauser zig zag mechanism, which is a good possible solution i think...

The Second idea also Sounds good... hm we will see

Has someone furthermore ideas?

Have a nice day
Thomas
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Re: Rotation mechanism Revolver pneumatic

Unread postAuthor: jackssmirkingrevenge » Thu Jun 22, 2017 10:13 am

You could also have the magazine preloaded by a spring and indexed by an escapement:

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This is how many rotary magazines on air rifles work, like this Daystate:

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Re: Rotation mechanism Revolver pneumatic

Unread postAuthor: sharpshooter » Thu Jun 22, 2017 4:21 pm

Are you dead set on pnuematics? You could set an Arduino to rotate a stepper or servo X number of degrees Y number of milliseconds after firing. Would only be a few more steps to make it continuous fire after that...
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Re: Rotation mechanism Revolver pneumatic

Unread postAuthor: Brain11 » Fri Jun 23, 2017 12:10 pm

Hey sharpshooter,

Yes, i only want pneumatic because i want a System that is fit for Action anytime also in a emergency situation...
With Electronic everything would be easier as you described, with a Stepper Motor and so on...
But you Need a power supply and so on, so i think there Are more possible errors in such a System...

Nice greetings from Germany
Thomas
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Re: Rotation mechanism Revolver pneumatic

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