Home › Blog › Buying Guide › Smart Buyer’s Guide: How to Choose the Right Pre-Owned, Used, Secondhand, Surplus CNC Equipment Before Purchasing Doosan DNM 350 5X CNC Vertical Machining Center (4+1) Axis made in South Korea Here’s a Smart Buyer’s Guide (inspection checklist, risk areas, negotiation levers, post-installation validation steps) tailored for evaluating a pre-owned / used / surplus 5-axis vertical machining center, specifically something like a Doosan / DN Solutions “DNM 350 / 5AX (4+1 / full 5-axis)” (South Korea origin)....