Something more complex than the last : My homemade thickness sander.
I tried to make it versatile: when not in use, I add a top and it becomes a gluing table in the middle of my shop.
I can also extend the shaft of the roll in order to power a buffing wheel.
It's described in details on my site, here : La Belle Note - Thickness sander
Have a look to my very special table lift system, based on wooden gears, inspired by the Master : Mathias Wandel ! (I say hello to him if he reads this)