A processing system comprising a powdery material feeding device (Z) including at least one feeder (Z1, Z1a, Z1b, Z1c) configured to discharge a reserved powdery material, equipment having a filling device (X) configured to be fed with the powdery material discharged from the feeder (Z1, Z1a, Z1b, Z1c) in the powdery material feeding device (Z) and configured to execute a post process using the powdery material filled by the filling device (X), and a controller (C; Z15), wherein the controller (C; Z15) is configured to, upon start of the equipment having stopped filling with the powdery material by means of the filling device (X) and executing the post process, cause the feeder (Z1, Z1a, Z1b, Z1c) in the powdery material feeding device (Z) to preliminarily supply the filling device (X) with a predetermined amount of the powdery material while the equipment is stopped, and cause the equipment to be subsequently started to fill with the powdery material by means of the filling device (X) and to execute the post process, and when the feeder (Z1, Z1a, Z1b, Z1c) in the powdery material feeding device (Z) supplies the filling device (X) with the predetermined amount of the powdery material before start of the equipment being stopped, to execute tuning of the feeder (Z1, Z1a, Z1b, Z1c), the processing system being characterised in that the tuning includes measuring a relation between control input provided to a motor (Z122) of the feeder (Z1, Z1a, Z1b, Z1c) and a flow rate of the powdery material discharged from the feeder (Z1, Z1a, Z1b, Z1c), in particular commanding predetermined rotational speed or output torque of the motor to the motor (Z122) in the feeder (Z1, Z1a, Z1b, Z1c) and measuring the amount of the powdery material discharged from the feeder (Z1, Z1a, Z1b, Z1c), and being further characterised in that it is configured such that the powdery material discharged from the feeder (Z1, Z1a, Z1b, Z1c) upon tuning is fed to the equipment configured to execute the post process, such that the entirety of the powdery material is not uselessly discarded. upon start of the equipment having stopped filling with the powdery material by means of the filling device (X) and executing the post process, cause the feeder (Z1, Z1a, Z1b, Z1c) in the powdery material feeding device (Z) to preliminarily supply the filling device (X) with a predetermined amount of the powdery material while the equipment is stopped, and cause the equipment to be subsequently started to fill with the powdery material by means of the filling device (X) and to execute the post process, and when the feeder (Z1, Z1a, Z1b, Z1c) in the powdery material feeding device (Z) supplies the filling device (X) with the predetermined amount of the powdery material before start of the equipment being stopped, to execute tuning of the feeder (Z1, Z1a, Z1b, Z1c), the processing system being characterised in that the tuning includes measuring a relation between control input provided to a motor (Z122) of the feeder (Z1, Z1a, Z1b, Z1c) and a flow rate of the powdery material discharged from the feeder (Z1, Z1a, Z1b, Z1c), in particular commanding predetermined rotational speed or output torque of the motor to the motor (Z122) in the feeder (Z1, Z1a, Z1b, Z1c) and measuring the amount of the powdery material discharged from the feeder (Z1, Z1a, Z1b, Z1c), and being further characterised in that it is configured such that the powdery material discharged from the feeder (Z1, Z1a, Z1b, Z1c) upon tuning is fed to the equipment configured to execute the post process, such that the entirety of the powdery material is not uselessly discarded. <EOS>