Double Disc Sander
A few years ago, I made a dual disc sander with 2 different grits on two discs.
Later I have found that it is mainly used for shaping, and the right disc with the 120 grit abrasive is seldom used.
But it was a fun build and you can read the build article here:
Building the double disc sander
Due to a narrow passageway, I had to make the table foldable.
Here are some images from the build:
Attachment 23512
Attachment 23513
Attachment 23514
Here you can see it in use:
https://www.youtube.com/watch?v=bWkVD3btP8M&t=