/diy/ - Do It Yourself

Hey guys,

I'm trying to automatically dispense pet food out of a 75mm (in diameter) PVC pipe. I have a continuous servo with torque of up to 13 kg.cm. Since I'm not a mechanical engineer, I can figure out which way is best to control the flow of food particles. I'm thinking either something like in the picture (but made out of welded sheet metal), or something like a 360 degree worm gear. I'm not sure which is most likely to get stuck, which requires less torque, and if there is a better design out there?

Thanks!