Home › Blog › Buying Guide › From Factory Floor to Your Workshop: Evaluating a Pre-Owned , Used , Secondhand, Surplus CNC Machines Before Purchase JOHNFORD SL650 CNC Turning Center made in Taiwan Here’s a detailed evaluation guide tailored for inspecting a pre-owned / surplus Johnford SL650 CNC turning center (horizontal / slant-bed lathe, made in Taiwan) — from first paperwork review to on-site mechanical and operational testing, and final decision criteria....