In this video we recondition an old tired Taft Peirce cast iron surface plate for my friend Carla. There were significant dings and divots in the plate so it was surface ground prior to hand scraping. The technique used is the same pattern and style of scraping used by the Moore special tool company for its jig borers and measuring machines. For more information on this style of scraping check out "Foundations of Mechanical Accuracy" By Wayne Moore.
https://archive.org/details/FoundationsOfMechanicalAccuracy