Machine tool for machining workpieces, preferably wood panels, said machine tool comprising a system for stopping workpieces to be machined comprising: a support for supporting at least one workpiece to be machined, in said support there being formed a plurality of openings which are in communication with at least one chamber which is provided under said support; a depression generation system which is connected with said at least one chamber to generate a depression in said at least one chamber; a plurality of valves, where each valve of said plurality of valves is associated with a respective opening and is movable between an opening position, where said opening is kept at least partially open by said valve such as to allow, when in use, the depression to propagate from said at least one chamber through said opening and stopping said at least one workpiece to be machined by attraction to said support, and a closing position where said valve closes said opening; characterised in that each valve of said plurality of valves is configured to move from said opening position to said closing position or vice versa when said each valve is powered by a potential difference which is equal to or higher than a set threshold value; and an electric power system for electrically powering said plurality of valves, said electric power system comprising a tension generator, at least one first electric line (15a 1, 15a 2,..., 15a n) which is connected with said tension generator and a plurality of second electric lines (15b 1, 15b 2,..., 15b n) which are connected with said tension generator, wherein each valve of said plurality of valves is electrically connected with said at least one first electric line (15a 1, 15a 2,..., 15a n) and a electric line of said plurality of second electric lines (15b 1, 15b 2,..., 15b n), such that when a set first potential is provided to said at least one first electric line (15a 1, 15a 2,..., 15a n) and a set second potential is provided to an electric line of said plurality of second electric lines (15b 1, 15b 2,..., 15b n), said at least one first electric line (15a 1, 15a 2,..., 15a n) and said electric line of said plurality of second electric lines (15b 1, 15b 2,..., 15b n) being connected with a set valve, said set valve moves from said closing position to said opening position or vice versa; the difference between said set first potential and said set second potential being equal to or higher than said set threshold value. a support for supporting at least one workpiece to be machined, in said support there being formed a plurality of openings which are in communication with at least one chamber which is provided under said support; a depression generation system which is connected with said at least one chamber to generate a depression in said at least one chamber; a plurality of valves, where each valve of said plurality of valves is associated with a respective opening and is movable between an opening position, where said opening is kept at least partially open by said valve such as to allow, when in use, the depression to propagate from said at least one chamber through said opening and stopping said at least one workpiece to be machined by attraction to said support, and a closing position where said valve closes said opening; characterised in that each valve of said plurality of valves is configured to move from said opening position to said closing position or vice versa when said each valve is powered by a potential difference which is equal to or higher than a set threshold value; and an electric power system for electrically powering said plurality of valves, said electric power system comprising a tension generator, at least one first electric line (15a 1, 15a 2,..., 15a n) which is connected with said tension generator and a plurality of second electric lines (15b 1, 15b 2,..., 15b n) which are connected with said tension generator, wherein each valve of said plurality of valves is electrically connected with said at least one first electric line (15a 1, 15a 2,..., 15a n) and a electric line of said plurality of second electric lines (15b 1, 15b 2,..., 15b n), such that when a set first potential is provided to said at least one first electric line (15a 1, 15a 2,..., 15a n) and a set second potential is provided to an electric line of said plurality of second electric lines (15b 1, 15b 2,..., 15b n), said at least one first electric line (15a 1, 15a 2,..., 15a n) and said electric line of said plurality of second electric lines (15b 1, 15b 2,..., 15b n) being connected with a set valve, said set valve moves from said closing position to said opening position or vice versa; the difference between said set first potential and said set second potential being equal to or higher than said set threshold value.