Gear up for speed.

Gear Down for slow.
This bubble blower needs both fast and slow.
The fan must go fast and the wands must go slowly.
 
 

To get a top to spin for a long time
what gearing might you use?


The top has an 8 tooth gear.  The spinner needs to have a bigger gear mesh with it.

Does adding a motor work better than by hand?
We had trouble with the long gear train binding up easily.

Just one quick twist of the handle could make the top spin for 30 seconds.

Now the whole class has tops spinning.