[sanddrag]

Originally Posted by sanddrag

If you do it correctly, you can get away with as little as 2mm clearance for 6wd. Of course that doesn't allow for wheel wear or running over dropped bolts or anything.

Originally Posted by Sean Schuff

Yes but can you climb the ramp AND get onto the platform that way? My guess is "no".

Guess again. You most definitely can. The trick is in carefully analyzing how the robot gets up the ramp and onto the platform. It is all in the weight distribution. If you get it right, your clearance can be next to nothing. The end that goes up the ramp first needs to be a bit heavier. We'll call the end that goes first the "front." See, when you go up the ramp, when the front wheels pass that edge between incline and flat surfaces, the idea is for them to keep going along the imaginary incline in the air and not touch down on the platform. The, once the center wheels have reached the edge between incline and platform, then you want the weight in the front to pull the front wheels wheels down (and the back wheels up off the ramp). You'll never get hung up between the front and center, or center and rear wheels, if you get the movement right. With proper weight distribution, it is very achievable.