How does it remove bumps and washboard since it is just dragging?
The blades are angled and therefore only cut the GRAVEL in one direction individually. When either blade is driven in the non cutting direction, it just rides over the DRIVEWAY surface much like the skid plates on a snow blower so it doesn’t dig the low spots. So if there are big bumps, you can back over them and pull or push the gravel into the depressions. The side rails also support the Driveway Groomer over the high spots and the material drops into the low spots. Angling the unit itself, by adjusting the chain lengths, helps cut washboard quickly.
