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This is a piston marble pump i made for my marble machine after seeing
http://www.youtube.com/watch?v=0Fg3SkLm0o8
It takes 5/8 inch marbles.
The reason I like this pump design is because it doesn't let the marbles clack together when there are no marbles in the feeder. It is also less likely to jam then a previous model I built.
---Update---
Added a picture of the pump installed in the dragon marble reservoir.
The marbles enter through a hole between the feet and tail and exit through the mouth.
The dragon was already made, so I had to fit the new pump underneath as best I could.
http://www.instructables.com/file/FYAHUUCFZWXOVBY/?size=SMALL
http://www.youtube.com/watch?v=0Fg3SkLm0o8
It takes 5/8 inch marbles.
The reason I like this pump design is because it doesn't let the marbles clack together when there are no marbles in the feeder. It is also less likely to jam then a previous model I built.
---Update---
Added a picture of the pump installed in the dragon marble reservoir.
The marbles enter through a hole between the feet and tail and exit through the mouth.
The dragon was already made, so I had to fit the new pump underneath as best I could.
http://www.instructables.com/file/FYAHUUCFZWXOVBY/?size=SMALL
I'm trying to "translate" your pump to Plastic elctrical piping, w/o much success..... I used a 3" hinge as backstop.
I think I'll be less independent, and just copy your system, or maybe make an elevator out of a cross-cut of an old tyre innner tube? (glue U-shaped blocks of wood to the outside with anaerobic glue to lift the marbles )