Method for cutting bars comprising the steps of: a1. prearranging a support and measure line (15, 150) supported by a support framework and shaping a support plane for bars, along a longitudinal axis; a2. prearranging a cutting device (16, 160) carrying cutting means, longitudinally mobile through said framework of said support and measure line (15, 150); a3. prearranging an abutment member at one end of said support and measure line (15, 150); b. feeding a determined number of bars on said support and measure line (15, 150), and arranging one end of said determined number of fed bars in abutment against said abutment member; c. longitudinally handling, through said framework, said cutting device (16, 160) along said support and measure line (15, 150), relatively to said determined number of fed bars; d. stopping said cutting device (16, 160) inside said support and measure line (15, 150), in a position relative to said abutment member, corresponding to a pre-established measure for said determined number of bars to be cut; e. operating said cutting means carried by said cut device (16, 160) at said relative position, to perform the cutting of said determined number of bars at said predefined measure; f. possibly repeating the steps c. to e. until completing the cutting cycle, said method being characterized in that it comprises the further steps of: a4. prearranging support means along said support and measure line (15, 150) which can be selectively operated between an active support position for said determined number of bars, substantially horizontal, and an inactive position (19") spaced with respect to said line (15, 150), suitable to free the passage for the insertion of said cut device (16, 160) on said determined number of bars to be cut; c1. selectively operating said support means in said inactive position (19") for allowing the placing of said cutting device (16, 160) along said support and measure line (15, 150). a1. prearranging a support and measure line (15, 150) supported by a support framework and shaping a support plane for bars, along a longitudinal axis; a2. prearranging a cutting device (16, 160) carrying cutting means, longitudinally mobile through said framework of said support and measure line (15, 150); a3. prearranging an abutment member at one end of said support and measure line (15, 150); b. feeding a determined number of bars on said support and measure line (15, 150), and arranging one end of said determined number of fed bars in abutment against said abutment member; c. longitudinally handling, through said framework, said cutting device (16, 160) along said support and measure line (15, 150), relatively to said determined number of fed bars; d. stopping said cutting device (16, 160) inside said support and measure line (15, 150), in a position relative to said abutment member, corresponding to a pre-established measure for said determined number of bars to be cut; e. operating said cutting means carried by said cut device (16, 160) at said relative position, to perform the cutting of said determined number of bars at said predefined measure; f. possibly repeating the steps c. to e. until completing the cutting cycle, said method being characterized in that it comprises the further steps of: a4. prearranging support means along said support and measure line (15, 150) which can be selectively operated between an active support position for said determined number of bars, substantially horizontal, and an inactive position (19") spaced with respect to said line (15, 150), suitable to free the passage for the insertion of said cut device (16, 160) on said determined number of bars to be cut; c1. selectively operating said support means in said inactive position (19") for allowing the placing of said cutting device (16, 160) along said support and measure line (15, 150). a4. prearranging support means along said support and measure line (15, 150) which can be selectively operated between an active support position for said determined number of bars, substantially horizontal, and an inactive position (19") spaced with respect to said line (15, 150), suitable to free the passage for the insertion of said cut device (16, 160) on said determined number of bars to be cut; c1. selectively operating said support means in said inactive position (19") for allowing the placing of said cutting device (16, 160) along said support and measure line (15, 150).