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Brief Instruction: This DC motor air-cooled spindle kit supports the the MACH3 software to control the rotational speed of the spindle motor High-speed air-cooled spindle motor, power 400W, maximum speed of 12,000 rpm which is widely used in CNC engraving machine, drilling/milling machine, etc. Specification: Spindle motor: Can be used for engraving metal or nonmetal materials. Weight :0.9kg ER11 collect: 3.175mm Repeat accuracy: 0.01-0.03mm Diameter of Axis collect holder:16mm Axis collet Length: 35mm Diameter:52mm Motor Overall length: 186mm (includes gripping parts and motor) Dielectric strength:400V Insulation resistance:>2Megohm Torque:500mN.m Power: 400W Rotation speed: 3000-12000r/min Work voltage: 12-48VDC PMW Speed Controller: Applies to DC12-60V low voltage permanent magnet brushed DC motor Operating Voltage: Wide Voltage (DC) DC12V-DC60V (Max 65V) Size :75mm x 75mm x 42mm Support Mach3 Control Mode: Default potentiometer control (5K-100K),defaults 10K; MACH3 -PWM speed control signal input, external PWM input requirements: level 3.5-12V VPP, frequency 1K-10KHZ, suitable for MACH3 spindle speed control. Rated current: 10A, overload and short circuit protection current 12A. (Over-current cut output, overcurrent indicator flashes, the potential light is off, overcurrent lift). soft-start function. Prevent excessive current caused by the motor and power damage (default 0 seconds soft start), 0-5 seconds adjustable. Control power: 12V120W, 24V240W, 36V360W, 48V480W, 60V600W Pulse width modulation range: 0% -100% Mount Bracket: Diameter:52mm Suit for :400W Brushless High-speed Air-cooled PCB Spindle Motor Weight : 410g What's in the box: 1 x 400W CNC Air-cooled Spindle Motor 1x PWM Speed controller 1x Mounting bracket 4x Screws