Abstract: Pistachio is one of the important horticulture crops and second exportable non-crude oil product after carpet. Generally, in Iran pistachio is peeled by bolt type peeling machines and the subsequent processes, including washing and dehydrating is fulfilled by a another machines. These peeling machines are made without any attention to mechanical properties of pistachio that this causes to break considerable percentage of pistachio when peeling. Therefore, it is essential to design a peeling machine with high efficiency that can carry out washing and dehydrating processes, too. So, a pistachio peeling machine designed and developed that can do peeling, washing and dehydrating processes simultaneously. The machine is designed on the basis of physical and mechanical properties of pistachio and all calculations related to strength of material done. In order to peel pistachio in this machine, centrifugal force is used. The unit consists of two main parts: the peeling set and the power transmission system. The peeling set consists of a rotating drum and a separate rotating circular base - plate. These two parts rotate in opposite directions, employing two separate electrical motors. The power transmission system of machine is mechanically by belt and pulley, so that they convey power of 3 hp between electrical motors and peeling set.

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