2. Spindle (RPM, Power & Torque): Aluminium machining may require higher RPM, while heavy steel cutting demands sufficient torque and machine rigidity. 3. ATC (Automatic Tool Changer): Choose a suitable tool capacity, such as 16, 24, or 30 tools. Check tool-change speed and reliability. 4. CNC Controller: Choose FANUC, Siemens, Mitsubishi, or another suitable controller based on your application, CAD/CAM compatibility, and local service support. 5. Mechanical Quality: Inspect the machine structure, guideways, ball screws, bearings, vibration control, and thermal stability. 5. Mechanical Quality: Inspect the machine structure, guideways, ball screws, bearings, vibration control, and thermal stability. 6. Machining Accuracy: Verify positioning accuracy, repeatability, spindle runout, and finished-part dimensions. Never rely solely on brochure specifications. 7. New vs. Used Machine: For used machines, inspect the spindle, ball screws, ATC, servo motors, alarm history, and maintenance records. 8. FAT & SAT Testing: Conduct trial machining and accuracy tests before delivery and after installation. Obtain written test reports. 9. Total Cost of Ownership (TCO): Calculate the complete cost, including transportation, import duties, installation, tooling, training, electricity, and maintenance. 10. Supplier & After-Sales Support: Verify warranty terms, qualified service engineers, spare-part availability, and feedback from existing customers. ⚠️ Final Advice Consult an experienced mechanical or maintenance engineer before purchasing. Compare specifications and quotations from at least 2–3 suitable machines. Rely on written agreements and practical test results, not just the supplier's verbal promises. Remember: If you purchase the wrong machine, you—not the supplier—will bear the financial consequences. Make your investment based on technical verification and actual production requirements, not sales promises.Follow big companies if necessary. Walton, R,F,L, Bengal Group, use different types of machines and get advice from them.