Making a Wooden Ball Joint | Japanese Woodworking

Router Brand: Makita Model Number: RT50DZ Router Bit 1（6×32㎜） Brand: HOZLY Model Number: 102060032 Router Bit 2（6×32㎜） Brand: HOZLY Model Number: 401060032 Double-Sided Tape (Removable) Brand: Nitto Model Number: 5000NS How to make a circle cutting jig Please wear goggles or similar protective equipment for safety while working.