Mechanum Wheel Sizes

[slijin]

Originally Posted by nxtsoccer

Do you think that having a way of keeping all wheels on the ground at once is very important, or should we concentrate more on a very sturdy frame (that has all four wheels on solid ground) and hope it doesn't warp too much?

The best way to keep all 4 wheels on the ground, imo, would be to use a suspension system, or some other mechanism that allows only vertical translational play, and that requires much more complex physics to effectively design.

Assuming you have a flat practice floor, work more on a sturdy frame, and just hope it doesn't warp. We went with a variation of the kitbot frame for our 2011 robot, and it held up fine for quite a while. Look at it this way - when you discover that your chassis' been warped, you can get someone to jump up and down on it!

The flat practice floor is really surprisingly important though. While calibrating speed control, we kept running into problems with the robot being unable to drive straight over certain areas of the floor, despite that we maintained much more control everywhere else. When we took a level to the floor, lo and behold, it wasn't flat, and when we dragged the robot over, we could visibly tell that one wheel wasn't touching the floor while it drove over that spot.

Originally Posted by IndySam

If you are going to order Nanos and hubs (a great choice by the way) go a head and order hex hubs and Nano's with hex shafts. SO much easier and stronger than using keys.

Reiterated just to agree.