CNC Harmonic drive reducer 4th A Rotary axis Speed reducing ratio with ER40 chuck

Retarder 4th A axis dividing head with ER40 chuck for Mini CNC router machine. Chuck: ER40 chuck Center height: 65MM. Angle: 0.036 degrees / step. Speed reducing ratio: 50:1 Stepper motor: two-phase stepper motor 57 Size: 210MM110MM105MM. SET 1 : Non Water-Proof motor 57.