... inertia, high speed, medium torque servo motor, precise torque control makes it applicable for thin/medium material lockstitch sewing machine ... , the system will locate it at the exact position.3)Speed control range: 0-5000RPM. Needle up/Down Correction Thread Trimming ... , wiping, Back tacking presser foot lift control. 4)Needle Position Accuracy±1.5°. 5)Thread trimming, ...