Hand scraping as a process allows a person without huge machine tools to make a worn machine just as accurate and "new" (or better than new) functionally as desired. The basic idea with scraping is to use reference flats, like a straight edge or

Scraping allows you to count points per square inch of flatness to create maximum surface area contact at any time between two surfaces. This kind of finish would serve no purpose in a knife, and would be ruined quickly.

There are several reasons to hand scrape: Accuracy Scraping is done to align components within millionths of an inch, allowing for consistently-held, tight tolerances. Flatness Eight to ten contact points per square inch are created to prevent rocking, ad