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Re: Remedy a too dropped center?
What wheels are you using?
You may be able to reduce the OD a little bit on the center wheel or increase the OD on the outer wheels.
How are your axles mounted to your frame?
If you are using pillow block bearings, the answer is pretty simple. Add a shim underneath the bearings of whichever wheels you want to raise.
How close is your CG to center?
You could move your CG towards one end of the robot so that it always (or almost always) "sits" on one set of four wheels.
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