Apprentices inspection reports for Operation 20 are included below.
Operation 20 required apprentices to square up all work pieces prior to completing subsequent operations. The process of squaring up the material qualifies materials surfaces flat and parallel/perpendicular with the opposite/adjacent sides. Apprentices inspected the results of squaring up material over several weeks of Hands-On Training and shown understanding of the importance of machine setup, specifically spindle squareness on the Bridgeport while completing the various steps at completing this operation.