That is very similar to the process used to put "Oil Pockets" in machine ways after they are scrapped in for flatness. While on my apprenticeship I had to put time in with the machine maintenance department & it just so happened while I was doing that a very good rebuilder was re-building a milling machine. I got some very good experience with him & learned how to do the scraping & Breaking Up, which was what he called this process.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra