Quote:
Originally Posted by Jon Stratis
My assumption, based on their post, was that the total active gear ratio they were using to climb was 60:24, as no other information was given. Even with just a 1/2" diameter, that wouldn't suffice - the ratio is still way off unless there's another stage he's not telling us about. Yes, winch diameter plays a big part in the overall gear ratio, but one thing at a time... get the gearbox to an acceptable range, and then you can size your winch according to that.
This is going to be the third time I've built a winch mechanism to climb with my team - Ultimate Ascent and BreakAway being the other two. In designing them, it all starts with the proper gear ratios in the gearbox, then moves on to the winch. It's just easier to size the winch appropriately than it is to change a gear ratio by just a little bit.
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They say they're using a two-CIM vex ball shifter, which leads me to believe that they're referencing a 3rd-stage when talking about a 60:24 ratio. Check out the reduction stages tab at this link for more info:
http://www.vexrobotics.com/ball-shifter.html