The frame consists of an outer box that is thirty inches long by twenty-four inches wide by ten inches deep. There are two inner rails that serve to strengthen the box and also to give a mounting point for the inner wheel bushing. I'll be welding in eight more 8.5-inch vertical posts (two per wheel) to act as wheel supports, and two more crossbeams across the bottom to serve as a mounting point for the motors. |
I've already made one goof: the inner rails are parallel to the outer rails, but the gap between them isn't the same everywhere. I set everything up carefully with a square, but I stupidly didn't tighten the nut on the square so it slid up and down. The difference was small enough that I didn't notice it at the time. Fortunately, all of the gaps are wide enough for the wheels. I drilled holes in the outside faces of the tubing before welding so that I could easily fit the tubing in my drill press. With Rott-bot 2000, I was drilling armor mounting holes with a hand drill after the welding, so the holes weren't square to the face of the tubing or necessarily centered across the tubing. I'm using tapped holes to mount the armor this year rather than nuts and bolts. Most of the holes aren't yet tapped. |
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