Which machine is primarily used for grading purposes?

The bulldozer is primarily used for grading purposes due to its design and functionality. It is equipped with a broad, flat blade that can be adjusted in various angles to efficiently move and reshape large volumes of soil, gravel, or other materials. The blade allows the operator to skillfully control the depth and angle of the cut, making it ideal for creating smooth surfaces, leveling areas, and forming slopes, which are essential functions in grading.

In contrast, the excavator is primarily used for digging and lifting materials rather than grading. The loader is designed for scooping and transporting materials but lacks the precise controlling mechanism of a bulldozer's blade for grading. Similarly, a dump truck is used for transporting materials rather than manipulating the ground for grading purposes. Hence, the bulldozer stands out as the most suitable equipment for grading tasks.