Massive screw compressor.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...y_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...or_cutaway.jpg
Previously:
https://www.homemadetools.net/forum/...247#post138544
https://www.homemadetools.net/forum/...244#post141921
