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Originally Posted by Ronald_raygun
The smoke and mirrors idea I like. But with the spring, any sources? And material of the barrel? Largest springs that I can find and replace easily are the kind found on those retractable pens  not exactly useful mind. |
hardware store: screen door springs
or surgical tubing!
or if you want to launch a whole box of tee shirts into the crowd with one shot: garage door springs! :^)
BTW, a couple years back, the game with the soccer balls: we were looking at shooting the soccer balls using a pneumatic cylinder from the kit. The problem we ran into was the valves could not release air fast enough into the cylinder to get any distance with the soccer balls.
The solution is: you have to let the cylinder extend about half of its travel, and hold it back with a mechanical block (trigger). You pressurize the cylinder, then you release the mechanical trigger. If you build something like this also remember you cannot let a pneumatic cylinder slam into its end of travel over and over - the end will eventaully break off the cylinder. You need a mechanical stop (a bumper) at the end to limit its travel.