how does the clay mixer work?

the mixer is basically a big box with  blades on a central auger - much like a large drill. It pulls the clay back and should spin it into a 'shell' of clay on the right side.
I WILL make sure the clay mixer is turned on when we are working - turn it off when you put your hand in!!!!
 I must turn the red handle toward the wall to keep it mixing the correct way.
DO NOT BLOCK up the right side with clay.
also --- see below pics for firm slab information

Why is a firm slab different than a soft slab?

- for a firm slab one cuts out the shapes and then lets them get firm before putting them together.
​-the project should have straight flat walls.

demo here
and here