[Cory]

Originally Posted by sanddrag

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.

The only problem with this strategy being that unless your wheels extend beyond the end rail of your frame, with 2mm of clearance you'll grind the edge of your frame into the ramp before the wheels contact the ramp surface