How do you make an escapement with a balance spring?
I have a problem
My cat has a weak stomache so he needs to have a lot of small meals during the day, but there's not always somebody at home, so I wanted to make a cat feeder device for this.
I want to make a disc that rotates slowly, during the day, leaving open another segment of a cilinder after every period of time. In every segment of the cilinder is cat food(which is poured into it that morning) Under the cilinder I want a clock mechanism, with a balance spring. I want to make it with a balance spring because it shouldn't be too high, my cat needs to be able to reach it's food normally.
I've made a mechanism with a pendulum before, but it was one meter in height, while now i want the mechanism about one inch in height. I thought only a balance spring would fit right in the cilinder under the feeder, but I never worked with one, I don't have one either.
How does a clock escapement with a balance spring work? And how can I get a balance spring? Can I just roll a long metal strip intro a spring?
My cat feeder doesn't need a complicated gear train, because whether it makes one revolution in 10 hours, or in 14 hours, that doesn't matter.