Can someone help me with questions concerning gear ratios?

Question

osprey · Answer

Is that gearing UP or gearing DOWN ?

osprey · Answer

I'm having a look at this one ... and, I'm starting with LEVERS. After all, a simple" gearing system is similar to lever. Differences are that the levers are limited to one dimension and don't go round in circles (I do a lot of that). You could argue that a simple screw is in fact an inclined plane wound round to get more distance available. Similar idea with a gear. So, if you can use a lever to pick up a 100kg mass, using a 10kg mass. then you have MECHANICAL ADVANTAGE. BUT you can't pick the 100 up AS FAR as the 10 moves down. (VELOCITY RATIO). If there's a way of adapting that idea into wheels with teeth, then you've got a gearing system. http://perendis.webs.com

osprey · Answer

encl is a pptx slide which may help. Let me know.