Manual scraping is a finishing process that uses scraper, datum plane, measuring tool and display agent to measure and scrape the workpiece manually, so that the workpiece can meet the requirements of size, geometry, surface roughness and compactness specified in the process. Because the tools used are simple and universal, with small machining allowance and high precision, they are widely used in machine tool manufacturing and mechanical equipment repair. Usually, the guide rail, carriage and bushing of sliding bearing of machine tool are scraped by hand.