Home › Blog › Buying Guide › From Inspection to Installation: What to Verify Before Buying a Pre-Owned, Used, Secondhand, Surplus Monarch VMC75B CNC Vertical Milling Machine Cat 50 made in USA Here’s a detailed guide—tailored to your second-hand machinery platform—on what to verify from inspection through installation when buying a pre-owned unit such as a Monarch VMC-75B (or similar) CNC vertical machining centre (Cat 50 taper in your case)....