[suneel112]

I am not an expert in gear boxes, but I know enough to say that one of the easiest ways to make a gear box is to have an input shaft with two gears a given distance apart. One should be large and the other should be small. There should be an output shaft with a small and big gear such that they fit together perfectly in any situation, except the big and small gear are spaced so that they can be switched by a pneumatic. In one example, say (for this year's game), you wanted arms so that they could go fast to manipulate the 2x ball and slowly to hang and attach the bar to a stable part of the robot (the arm just lifted it up). Then you would have the big to small (say 1:1.5) used for the small ball and the small to big (say 3 or 4 :1) used for hanging. when the pneumatic is in, it is in low gear (1:1.5), but when the pneumatic is out, it is in the high gear (4:1).

Warning: By SIMPLICITY, I meant simplicity to BUILD. That does NOT mean that it will have a low weight (especially if you have only a hand tool/sharpie system). To reduce weight, welding is an option, and so is using lighter materials, such as aluminum (use it only on the big sprockets, which have force per socket). This is not a design, you will have to play around with it, but it is a basic idea for a transmission. If you are a beginner, I suggest that you don't try an expert transmission, such as the excellent one built by team 222 (The Tigertrons), without some engineering expertise.