Home › Blog › Buying Guide › From Factory Floor to Your Workshop: Evaluating a Pre-Owned , Used , Secondhand, Surplus CNC Machines Before Purchase OKK HM 50 made in Japan Here is a comprehensive guide you can use when auditing a pre-owned / surplus OKK HM-50 (horizontal / “HM50”) CNC machining center (Japan origin) — from initial screening through on-site tests to final decision criteria....