Deciding whether to recondition a machine or buy a new one depends on several factors:

The saddle and table interfaces on a bridge-port or CNC mill require scraping to ensure the X and Y axes remain perpendicular (square) to the spindle. 3. Surface Plates

Hand scraping is not used for every part of a machine; it is reserved for critical bearing surfaces where metal-to-metal contact occurs. 1. Lathe Bed Ways

Machine Tool Reconditioning and Applications of Hand Scraping PDF Link

What are you looking to restore (Lathe, Mill, Grinder)?

The "V" and flat ways of a lathe must be perfectly straight. Scraping ensures the carriage moves smoothly without rocking, which is vital for maintaining tight tolerances over long workpieces. 2. Milling Machine Tables