Weingärtner has redefined the term âwhirlingâ and turned it into one of the most cost-efficient processes for the production of feed, extrusion and injection moulding screws. Moreover, whirling puts you on the global pace with rotors and stators for progressive cavity pumps. Small wonder therefore that the Weingärtner mpmc (turn-mill /mill-turn) center is exceptionally popular amongst company customers.