A coin sorter separates a collection of mixed coins into groups of different sizes. If you have a coin bank or just a cup that you keep change in you will know how annoying it is to have to sit and move each coin into its own pile. You can speed up the tedious process by making a coin sorter that operates using gravity. You will need containers that fit inside each other and leave at least 1-inch gap between the containers.
Trace each of the differently sized coins onto the bottom of separate rectangular plastic containers, except for the smallest coin, with a marker. If you have four different coin sizes, you will use four different plastic containers but only drill into three of them.
Find a drill bit that makes a hole several millimetres smaller than the traced shape in each container.
Drill several rows of holes with the appropriate bit for each container in the bottom of the containers. The holes should be spaced about 1 inch apart from each other.
Place the undrilled container on a table. Insert the container with the smallest drilled holes inside the undrilled container.
Put the next smallest holed container inside the stack and place the largest holed one on top.
Save one of the covers and place it on top of the top container to keep the coins in while you are shaking them.
Hold the container steady while you drill or it will spin away and could hurt you.