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Help you to Understanding Gear Reducer(2014-03-07)

The reason that we need to know about Gear Reducter is because the output speed of a motor is usually too fast for normal use. Quite simply, Gear Reducter involves using gears/sprockets/pulleys of two different sizes to work together. Because Gear Reducter  are of differing sizes they will have different circumferences and we can use this to our advantage.  Let's take a look at what this circumference thing really means. To the left is a representation of a 4 inch diameter wheel. Click on the wheel to watch it as Gear Reducter moves through one complete revolution. You will see that the distance covered in one revolution is equal to the circumference of the wheel.
Now, let's take a look at a wheel that is twice the size. Click on the 8 inch wheel to watch Gear Reducer as it goes through one complete revolution. What you will notice is that not only does the wheel have twice the diameter but it travels twice the distance in one revolution. Therefore the circumference is twice that of the 4 inch wheel. So, if the 4 inch wheel were to cover the same distance as the 8 inch wheel then it has to complete 2 full revolutions.
Well, the two main disadvantages are #1 you lose speed and #2 you have added weight for the Industrial Gearbox. But, on the other hand, there are some great advantages to using Gear Reducer. First, you bring the bot down to a manageable speed.Second, the motor doesn't have to work as hard to spin the wheel which means it won't draw as much current from your batteries. And third, along those lines, the torque produced by the output is inversely proportional to the amount of reduction in the Industrial Gearbox. Say what? Basically, if you have a 4:1 Industrial Gearbox then the bot moves 1/4 as fast but has 4 times the torque! So you can have a 120 pound robot with the right gearing that will push a 400 pound load across the floor!
The optimum configuration will give you greatest speed but still have enough torque to cause the wheels to break traction(peel out) before the motor stalls. That optimum configuration varies from bot to bot and is up to you to figure out how to best implement it with your own robot.