3.5kW CNC Spindle Motor Kit With Four Bearings, Air Cooled 220V Spindle For Router And Milling Machines, Built Tough For Ultra Stable Performance, 0.02mm Runout, High Rigidity For Clean, Smooth Cuts And Long Tool Life

Ultra-Stable 3.5kW CNC Spindle Kit (1) with Four Bearings
✔️ Air-cooled 3.5kW spindle with four bearings, ER20, 0.02mm runout

This air cooled CNC spindle kit is designed for hobbyists, small shops, and educational labs. It powers precise routing, milling, and drilling on wood, aluminum, plastic, and stone. It pairs well with standard linear slide unit setups for clean, accurate motion.

✅ 4 upgraded bearings with dynamic balancing, 0.02mm radial runout
✅ Air cooling eliminates external water lines for simple setup
✅ 3.5KW spindle, 18000 RPM, stepless speed control for smooth cuts
✅ ER20 collet fits common end mills; sturdy spindle construction
✅ 9 kg weight with rugged housing for high rigidity
✅ Includes spindle and 220V frequency converter in the kit

💡 What is the best CNC spindle for a small hobby workshop? This handy guide helps you weigh power, cooling, and rigidity for reliable results.
-Power rating and torque for woodworking and light metal work
-Cooling method: air cooling keeps setup simple in home spaces
-Runout and bearing quality affect finish and tool life
-Ensure compatibility with ER20 and the frequency converter