Aunt B was the first one to make the great guess. She was absolutely correct. Carletta was real close.
This is a conveyor from a lathe that is used to carry the metal turning from the lathe. The metal shavings are curled and the blue color on some is from the heat of turning. Wood is also cut on a lathe and these turning occur there also.
This picture is showing the bin and part of the lathe.
I hope you had fun.