hi all. i have an assignment to design a gear system. so, anyone can suggest me a software that i can make a simulation about a gear? prefer simple software that got a lot of function. thank~~ Edit: i tried this software http://gears-simulator.software.informer.com/3.0/ but i need a function to increase the length of gear where it didn't have in this software (or maybe i didn't found it) btw, sorry for my bad english.