Activate Grinding Station by tapping it and sacrificing another artifact, causing you to mill three cards.
Cast Desperate Ritual from your graveyard for its escape cost by paying ({1} magic symbol) ({R} magic symbol) and exiling three other cards from your graveyard.
Saheeli triggers, creating a 1/1 Servo artifact creature token.
The Servo enters the battlefield, triggering Grinding Station, untapping Grinding Station.