To make a foundation for a sand crusher, you will need to dig a hole in the ground that is deep enough to accommodate the size of the crusher unit and provide enough space for the base. The hole should be wider than the unit itself to allow for proper drainage. Once the hole is dug, you should add several inches of crushed stone or gravel to the bottom of the hole. This will provide a stable base for the crusher unit to sit on. Next, add a layer of sand on top of the crushed stone or gravel. The crusher unit should be leveled and anchored securely to the foundation using concrete or steel anchor bolts. Once the unit is in place, backfill the hole with soil, and compact it firmly to prevent any settling.