A trimming-deburring assembly which performs operations for making a piece from a casting by performing cutting operations of parts to be discarded from the casting, for example, sprues, cast runners, wells, vacuum branches, foundry burrs and/or similar, using a trimming-deburring die comprising an upper movable die half and a lower fixed die half, wherein the trimming-deburring assembly comprises: - an upper fixed plate; - a lower fixed plate on which the lower fixed die half is housable; - an intermediate mobile plate that is movable between the upper fixed plate and the lower fixed plate, in a vertical direction parallel to a main axis (X-X), wherein the upper mobile die half is housable on said intermediate mobile plate; - command and movement means suitable for moving the intermediate mobile plate comprising: i) an electric motor housed on the upper fixed plate; ii) a movement group operatively connected on top to the electric motor and on the bottom to the intermediate mobile plate comprising: - a spindle member drivable in rotation about said main axis (X-X) by the electric motor, comprising a spindle cavity along the main axis (X-X) and comprising a worm gear element equipped with a worm gear cavity defined by a threaded worm gear wall; - a worm screw element which extends along the main axis (X-X), housed at least partially in the spindle cavity and the worm gear cavity, comprising a threaded screw wall engaged with the threaded worm gear wall and a lower end operatively connected to the intermediate mobile plate wherein the rotation of the worm gear element involves an axial movement of the worm screw element and in turn a change in the height of the intermediate mobile plate. - an upper fixed plate; - a lower fixed plate on which the lower fixed die half is housable; - an intermediate mobile plate that is movable between the upper fixed plate and the lower fixed plate, in a vertical direction parallel to a main axis (X-X), wherein the upper mobile die half is housable on said intermediate mobile plate; - command and movement means suitable for moving the intermediate mobile plate comprising: i) an electric motor housed on the upper fixed plate; ii) a movement group operatively connected on top to the electric motor and on the bottom to the intermediate mobile plate comprising: i) an electric motor housed on the upper fixed plate; ii) a movement group operatively connected on top to the electric motor and on the bottom to the intermediate mobile plate comprising: - a spindle member drivable in rotation about said main axis (X-X) by the electric motor, comprising a spindle cavity along the main axis (X-X) and comprising a worm gear element equipped with a worm gear cavity defined by a threaded worm gear wall; - a worm screw element which extends along the main axis (X-X), housed at least partially in the spindle cavity and the worm gear cavity, comprising a threaded screw wall engaged with the threaded worm gear wall and a lower end operatively connected to the intermediate mobile plate wherein the rotation of the worm gear element involves an axial movement of the worm screw element and in turn a change in the height of the intermediate mobile plate.