Making a custom workstation play an animation while it is being used

[bloodlust67]

For example: I have a stone flour mill. I have the animation I made for the wheel to spin around as the handle goes round and round in the mill. I can make it either constantly play the animation (not ideal) or not play the animation ( defeats the purpose of making the animations!). So does anyone here know how to set it up so that the mill is still until someone puts some wheat in the mill to make flour, then it starts playing the wheel animation going round and round? Or is there a tutorial for this sort of thing anywhere?

Thanks in advance!

 

[bloodlust67]

nothing??