So the lost art of scraping is not lost if you have a copy of "Machine Tool Reconditioning" by E. F. Connelly. Probably the best information on the why and how of scraping and machine tool reconditioning out there. Written in 1954, after numerous printings the Connelly family renewed the copyright in 1985 for another printing. I am not aware of a renewal since. In the early 90's Lindsey Publications got a hold of the publishers remains and sold them in his catalog. At $40 a pop they didn't last long. There are links to a poorly scanned and uploaded copy on the web, though I can't remember where now, a search should find it. It's probably a long shot but if someone is foolish enough to accept used book prices for it, it would be your gain.
Here are images of the cover, title, and contents page. Here also is the first chapter "The Art of Scraping" a beginners overview. I will try to upload Chapter 6 "Manipulating The Scraping Tool" later in the week. That would provide the basics, at 533 pages there is much more to scraping and tool reconditioning. If I get a request for more info I'll try to get more chapters uploaded in the future.
Click on the images to expand.
And here is a worn machine chuckle.