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Question1: why still not receive my order?
Answer1: sometime, some cargo would be slightly delay on road. Please contact with us first, we will offer a good solution for you. Question2: what is the material of the gear? Answer2: The motor gears are made of metal. If you need other materials, you can contact us. Question3: what is the torque mean? Answer3: torque is the weight that the motor can load at a certain voltage and speed. If the motor you purchased is 12v 9rpm, its corresponding torque is 60kg.cm. This means that when the motor is at 12v and 9rpm, it can load 60kg objects with a diameter of 1cm. If the diameter of the load is 10cm, then the rated torque is 6kg. Please do not exceed the rated load during the use of the motor, otherwise the gear is prone to wear and tear. Question4: how to change rotation direction? Answer4: please change wiring polarity to change rotation direction. Question5: how to change speed? Answer5: you can buy our below speed controller, to change speed from 0-10rpm. Question6: what is the meaning of PackageA PackageB? Answer6: If you order PackageA, you will receive a motor as shown in the picture "PackageA". If you order PackageB, you will receive a motor and a mounting bracket as shown in the "PackageB" picture. We show what you will receive in the package image. Question7: what happens when a voltage of 18V is connected to a 12V motor or an 18V motor? Answer7: The 6V and 12V motor connection 18V voltage will be broken, and the 24V motor connection 18V voltage will affect his speed and torque, and will not even run. If you have any question and problem in using, please contact us first. We will try our best to resolve the problem. ========================================================