How it works ?Start by detaching the gears of wooden planks, then identify all the small parts and hardware.
. This fabulous DIY kit from Koa Koa will allow you to build your very own doorbell for the door to your room, engaging in STEAM learning (Science, Technology, Engineering, Arts & Mathematics) Not only will they have a fun building it but they'll love playing with it afterwards.- the ratios to calculate the speed at which the gears are turning- the effect of friction, the crank Once mounted, you can paint it to customize it and nail it at the door of your room (there are 4 holes on the sides for that purpose).Koa Build A Hand Crank Doorbell You had better ring the bell before coming into my room, or maybe even my den? What will you learn?- The different types of gears: gear trains, rack, pinion, circular, etc.