I maintain a long curving driveway with a box blade and it works fine. As the road is used, gravel accumulates to the outside of the curves, and to the edge on straight sections. With no angle setting on a box, the challenge is to get the gravel back on the road.
The technique I use is to first work the loose gravel toward the middle by tilting the box, low on the left (where I can see it in my mirror), then follow the edge of the road but about 6" in. This picks up gravel from the left side and 'rolls' it toward the middle. Gravel escapes from the box toward the middle of the road. I start about 6" in from the edge because I always float the box so the tractor does not effect the depth of the box when the front wheels rise or drop, otherwise moguls form. As previously pointed out, a following wheel would do this too.
The box is pulled at least 6" inside the road edge because when the box fills I don't want the spillage to overflow off the road. I let it spill over and land on the road near the edge, to be gathered the next pass.
After the first pass both directions, move the edge of the box to the edge of the road. The reduced amount of gravel will probably not fill the box so little spillage occurs. This pass both directions leaves the edges of the road well trimmed of gravel.
The mass of gravel is now in the center 3/4 of the road. The box has been in float so the road does not have moguls. The last pass is made with the box level. The box should quickly fill completely and spread gravel from edge to edge of the box, and by driving faster the gravel is actually deposited wider than the box. My box is 7 ft so that makes the width just about perfect.
BTW, tractor is a model 406 Unimog, designated a Case MB-4/94 when Case marketed it in the USA for MB.
Bob
