We call this machine in Thailand, a rotate hoe. A rotary, in English. or rotary tiller. It is a soil preparation machine that breaks soil into small pieces. It works on both dry and wet paddy field. Today, the demonstration will be on a dry field. … and later on a wet field. Rotary tiller is run by PTO shaft of a tractor. From the PTO of the tractor, the shaft is connected to the joint and then a gear box. Power is transferred from the gear box to the side to move the chain. The chain inside, rotates like this. Look down here. See the shaft that is rotated by power from a chain. The name rotary tiller came from this rotated shaft. A blade is arranged on a shaft in a spiral fashion. Looks like pineapple eyes. So that the rotary tiller can break the soil at less power. Blades have different types. This one is L-type. Good for chopping the soil. C-type and the combination of L- and C-types for different soil types. For example, soil with lots of weeds may need a C-type blade. This L-type blade breaks the soil into fine particles. The normal speed of PTO for a rotary tiller is 540 rpm. Some models can rotate at 1,000 rpm. There are 2 ways to adjust the fineness of tilled soil. 1) Run the tractor at low speed to make the tilled soil fine. or 2) Close the back lid. Tilled soil is broken more when crashing against the lid. To get rough tilled soil, run a tractor at faster speed and open the back lid. The size of a rotary is based on its length. This one is 1.5 m long. Start the engine and choose the optimum forward gear. The PTO runs the rotary tiller to break the soil. Let’s see how it works.