2 truck drive train

[Elgin Clock]

Originally Posted by Alex1072

Because this acts like a swerve/crab:

it can go like this:

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or turn in place like this:

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and what I like most: because the turning is controlled by truck rotation, you don't have to control motor output carefully to get it to go straight. Just servo the steering trucks. It will go straight or turn like a car. The differential will minimize wheel slip.

Looks strikingly familiar to THIS!!!
edit: Warning large file!

[RoteAugen]

What it sounds like you are trying to accomplish is a 4 wheel ackerman-type steering system. For those of you who do not know what that is, Ackerman steering moves each wheel in porportion to the others in order to make the car, robot, whatever's wheels move on the same radial axis, but two different radii. basically get a centerpoint, then draw two circles inside of each other. the inner circle is the circle the inner wheels will leave, the outer circle is the circle the outer wheels will leave.

the truck idea you brought up would accomplish this, but it would require a very slow, strong motor... but there is a more efficient way to do this. If you have questions, seek out team 138 at the nats and they can show you what it looks like (it uses only one globe motor, and is powerful enough and fast enough to maneuver around the stationary goals and other robots.)

the Hummer mk2 can show much...