Truing the geometry of a bed of a 1A616K (USSR-made) lathe. Since the bed has hardened ways, I decided to do rough scraping with an angle grinder. Using thin 1mm cut-off wheeling a small 600w angle grinder, surface comes out pretty flat. I also tried a grinding wheel, it goes much faster, but then I have to leave much more material for the further fine scraping. After scraping with an angle grinder, it's necessary to finish the surface with a regular hand scraper.