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Unread 28-05-2015, 18:58
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GeeTwo GeeTwo is offline
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AKA: Gus Michel II
FRC #3946 (Tiger Robotics)
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Re: Swerve with a twist

Quote:
Originally Posted by TheHolyHades1 View Post
Are you suggesting something like what I've attached?
If the boxes at the top of the steering modules are motors or servos, I don't think so.

A bit off topic, but your robot reminds me of a linkage drive I played with a few years ago that "shifted" from forward to transverse driving through the regular drive motors. The idea was that the steering of the wheels were coupled so that the left front and right rear pointed the same direction at all times, as did the right front and left rear. Adjacent wheels steered in opposite directions. At one end of the 90 degree range of steering, all pointed "forward" and at the other, all pointed "transverse". When driving forward, the two left wheels were controlled to have the same speed, and the two rights. When driving transverse, the two forwards would match, and the two rear wheels would match. In each of these states, there was theoretically no net torque seeking to shift from one state to the other (practice wasn't so kind). To "shift" from forward to transverse or back, one diagonal pair was driven clockwise, and the other counterclockwise for a second or so. Eventually I realized that it was really just a lobster drive that required four proportional controls. Originally, I had ideas that it could also settle in a "rotate" state halfway in between the other two, but I could never find or hold that state without even more complexity and possible points of failure.

Addendum: also, due to more to lack of fabrication skills and tools than the design, it was probably the ugliest machine I've ever built.
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Last edited by GeeTwo : 28-05-2015 at 19:09. Reason: addendum