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Help with motion direction changing for revolver type cannon

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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Help with motion direction changing for revolver type cannon

Unread postAuthor: 30cal man » Sat Aug 01, 2009 4:35 pm

ok in my quest for a awesome paintball shotgun ( and by shotgun i mean something with shells that shoots alot of little 6mm paintballs at once 25-50 a shot) i have came up with a design i wan to use for the firing mechanism and although it will have a revolving chamber i want it to be pumped to cycle the cylinder which is where the problems lie i can not figure out how to take the back stroke of the pump and make it rotate a cylinder a 1/8 or so of a turn the return stroke can be used aswell but docent have to be but i want a pump because of the mechanism i have decided to use as its power/valve any help on this will be muchly appreciated thanks
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Unread postAuthor: Hotwired » Sat Aug 01, 2009 4:42 pm

All been done before ^^

http://en.wikipedia.org/wiki/Webley-Fosbery_Automatic_Revolver

Solar has a very similar system to rotate the spindle of his Eclipse cannon but you don't see it because it's internal, his is actually operated by a pneumatic cylinder which (presumably) pushes a pin along the grooves to turn the spindle to the next cartridge.

Instead of the Webleys automatic system or the Eclipses pneumatic system you use a manual system.
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Unread postAuthor: boom shtick » Sat Aug 01, 2009 5:28 pm

can you show us what you`ve got o` your plans so far?
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Unread postAuthor: hi » Sat Aug 01, 2009 8:25 pm

http://science.howstuffworks.com/revolver2.htm

take apart a revolver if you can get your hands on one. They are very simple. all you need is to add a pump to the hammer and you've got yourself a revolving shotgun.



the advice i would like to give for the cylinder is to take some foam board (from hobby shop or insulation foam from hardware store, if they ask tell them its for a model airplane) about 1'' thick and use a compass and marker to make a circle, cut it out with a razor/exacto knife then draw a perfect cross on it, then rotate the board 45 degrees and do it again. that will give you a perfect circle as well as 8 spots to evenly place the chambers. build two of these, drill the holes ( I would use 1/2'' pipe for the chambers) and glue them together using foam safe epoxy, then sheet it with 1/32'' balsa wood, also from a hobby shop. i would sheet it with two layers, then cover it with CA glue.

for the notches that the pawl lifts the cylinder with can be made of brass tube, again, from a hobby shop. the pawl it self can be made of sheet metal, use snips to cut it.

that is probably the easiest way to make a cylinder without a lathe and expensive machinery. ive never done it, but i don't see why it wont work.

Revolvers are very simple, but unless you can take one apart i dont know how I can explain how it actually works, but believe me when i say its simple.

sigh, after that little brain storm now i want to build one...
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Unread postAuthor: inonickname » Sat Aug 01, 2009 9:04 pm

(hi), what I'd do with that would be to make the foam mold of exactly what you want, then cast it with aluminum (lost wax/foam replacement casting).

That's only if you have the stuff to do it with..
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Unread postAuthor: 30cal man » Sun Aug 02, 2009 7:31 pm

that webley-fosbery is awesome but i cant find anything about how it works and even though i wanted it to be pump because i thought it would be easier to accomplish a semi auto motion would be helpfull so far i have a vlave and a way to fire it semi auto but in need of a simple way to turn the cylinder i seen the revo semi but dont like the fact that the pump shoots it
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