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By: seamushroom
New: 20-09-2015 15:53
Updated: 20-09-2015 15:53
Views: 983 times
the modules are designed to be in constant contact with the ground, and have a travel of ~1.75 inches up ad down, which should be enough travel for most WCD drive trains, depending on wheel size. These allow us to get a more accurate idea of where our robot is, which is especially important for autonomous. Feel free to Critique!
--Seamus (2491)
Discussion
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20-09-2015 22:48
Munchskull
Re: pic: Diagonal View
Correct me if I am wrong, but this looks like a passive wheel with and encoder attached to it. So when you move it tracks the distance. I assume that you would use two of these on a robot, one in an x axis and one in the y axis (assuming you are looking at the field from above).
21-09-2015 11:58
nuclearnerd
Re: pic: Diagonal View
Great job with the CAD work. I can critique the design a bit:
You're going to have all kinds of trouble with the sliding link. A good rule of thumb for sliding joints is that the ratio between bearing length (in the direction of sliding), and bearing diameter (or spacing) should be greater than 2:1, otherwise when one side starts to grip a bit, the whole bearing will twist and jam. You've got hardly any bearing length in this sketch, so jamming would be a real concern.
Another good rule of thumb is to prefer rotating joints to sliding joints - so if you can redesign this to use a trailing arm, you'll have more chance of success.
21-09-2015 13:22
dougwilliams
Re: pic: Diagonal View
Is the plan to rely on the weight of the wheel to keep the wheel in constant contact with the ground? I was looking for some sort of spring device for that purpose. Even without binding as noted by nuclearnerd, I would be concerned with it "skipping" and sliding along the wheel direction rather than rotating.
But it is a nice design, our team had considered some way of using a tracking wheel for measurement last year and didn't go through with it. We were accurate enough on Mecanum wheels, and timing alone (with gyro angle corrections) to do a 3-stack autonomous.
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