GOWE 1pcs chuck 3.175 1/8 &CNC Spindle Motor 300 W & power supply & speed controller & bracket Set for Mach3 Features : Spindle Motor: Work voltage: 24-52VDC Rotation speed: 3000-12000r/min  Power: 300W Torque:230mN.m Insulation resistance:&gt;2Megohm Dielectric strength:400V Motor Length : 175mm Diameter:52mm Axis collet Length: 48mm Diameter of Axis collect holder:16mm Repeat accuracy: 0.01-0.05mm ER11 collect: 3.175mmPWM Speed controler: Driven from 5V to 110V DC motor, DC motor speed control. Such as equipment of DC pumps, engraving machine ,fans, spindle speed of DC motor for precise control. Features: Can support AC and DC input. Non-existent power supply polarity problems. Ultra-high voltage scope. support 12-160VDC Input. support 9-110VAC input. Ultra-high-power control. Max 10A current. Large radiator with mounting holes. Except the board inside a PWM speed control, can also support an external PWM signal input speed control, external PWM input requirements: level 3.5-12V VPP, the frequency of 1K-10KHZ, in particular apply in MCH3 spindle speed control.A wide range of support motor. Basic right into the letter drive of the market all the DC motor speed control. As long as the DC resistance of the motor is greater than 2 Ohms DC resistance can. Note in particular that this drive can not be less than the DC resistance of 2 Ohm DC motor speed control. Equipped with a fuse protection and better performance. power indicator, and more convenient to use. All motors are not include BRAKE,if you need please contact us and we can match for you