How do you make more than one object spin at a time?

I am making a sort of washing machine and I have everything set but I have to either hookup a motor which I can not change the speed or turn on and off So I would like to know if there is a way to turn a Motor on or off or change the speed on it I have tried multiple Solutions but so far none of them have worked. I do currently have all of the stuff that is needed to be welded, welded so that it can all stick together I hope someone out there knows how to fix this. :/ Please help me I am trying to get this done for my friend so They can play their games more realistic.

My recommendation is to weld each part together or make it a union.