How Rotavator Blades Work on a Power Tiller – with Reaper Attachment When attached to a power tiller, rotavator blades rotate horizontally beneath the machine. Their main job is to break up, churn, and mix the soil to create a fine seedbed. The blades dig deep, cutting through hard clods, removing weeds, and improving soil aeration. This makes the land ideal for planting. 🔧 The power tiller’s engine drives the rotavator blades through a gear system or PTO (power take-off shaft), causing them to