Clamping system (9, 10) for clamping workpieces, in particular for machining the clamped workpieces in a machining centre, with a) a carriage guide, b) a first carriage (13, 14) which b1) is guided by the carriage guide, b2) is displaceable along the carriage guide, and b3) which has a first clamping jaw holder to which a first clamping jaw (17, 18) can be attached, c) a second carriage (12, 15) which c1) is guided by the carriage guide, c2) is displaceable along the carriage guide, and c3) which has a second clamping jaw holder to which a second clamping jaw (16, 19) can be attached, d) a rotatably supported clamping spindle (24, 25) which, on the one hand, engages on the first carriage (13, 14) and, on the other hand, on the second carriage (12, 15) in order to clamp the two carriages (12, 13 or 14, 15) with respect to each other according to the rotational position of the clamping spindle (24, 25), and e) a third clamping jaw holder (20, 21) which e1) is fixedly mounted on the carriage guide, e2) wherein a fixed jaw (22, 23) can be mounted on the third clamping jaw holder (20, 21), f) wherein the clamping system (9, 10) enables a "third hand" function, and with g) a slide (26, 27), wherein the slide (26, 27) g1) is displaceable along the carriage guide, and g2) cooperates with the first carriage (13, 14), characterised in that h) the third clamping jaw holder (20, 21) is arranged between the first clamping jaw holder and the second clamping jaw holder, i) in that a first workpiece (3, 4) can be clamped between the first clamping jaw (17, 18) and the middle fixed jaw (22, 23), while a second workpiece (2, 5) can be clamped between the second clamping jaw (16, 19) and the middle fixed jaw, j) in that the slide (26, 27) is displaceable by means of a rotatably supported adjusting spindle (28, 29), and k) in that the slide (26, 27) defines a certain range of movement of the first carriage (13, 14) with respect to the slide (26, 27) such that in each case the slide (26, 27) forms a limit stop for the first carriage (13, 14) at the limits of the range of movement in order to enable the "third hand" function. a) a carriage guide, b) a first carriage (13, 14) which b1) is guided by the carriage guide, b2) is displaceable along the carriage guide, and b3) which has a first clamping jaw holder to which a first clamping jaw (17, 18) can be attached, b1) is guided by the carriage guide, b2) is displaceable along the carriage guide, and b3) which has a first clamping jaw holder to which a first clamping jaw (17, 18) can be attached, c) a second carriage (12, 15) which c1) is guided by the carriage guide, c2) is displaceable along the carriage guide, and c3) which has a second clamping jaw holder to which a second clamping jaw (16, 19) can be attached, c1) is guided by the carriage guide, c2) is displaceable along the carriage guide, and c3) which has a second clamping jaw holder to which a second clamping jaw (16, 19) can be attached, d) a rotatably supported clamping spindle (24, 25) which, on the one hand, engages on the first carriage (13, 14) and, on the other hand, on the second carriage (12, 15) in order to clamp the two carriages (12, 13 or 14, 15) with respect to each other according to the rotational position of the clamping spindle (24, 25), and e) a third clamping jaw holder (20, 21) which e1) is fixedly mounted on the carriage guide, e2) wherein a fixed jaw (22, 23) can be mounted on the third clamping jaw holder (20, 21), e1) is fixedly mounted on the carriage guide, e2) wherein a fixed jaw (22, 23) can be mounted on the third clamping jaw holder (20, 21), f) wherein the clamping system (9, 10) enables a "third hand" function, and with g) a slide (26, 27), wherein the slide (26, 27) g1) is displaceable along the carriage guide, and g2) cooperates with the first carriage (13, 14), characterised in that g1) is displaceable along the carriage guide, and g2) cooperates with the first carriage (13, 14), characterised in that h) the third clamping jaw holder (20, 21) is arranged between the first clamping jaw holder and the second clamping jaw holder, i) in that a first workpiece (3, 4) can be clamped between the first clamping jaw (17, 18) and the middle fixed jaw (22, 23), while a second workpiece (2, 5) can be clamped between the second clamping jaw (16, 19) and the middle fixed jaw, j) in that the slide (26, 27) is displaceable by means of a rotatably supported adjusting spindle (28, 29), and k) in that the slide (26, 27) defines a certain range of movement of the first carriage (13, 14) with respect to the slide (26, 27) such that in each case the slide (26, 27) forms a limit stop for the first carriage (13, 14) at the limits of the range of movement in order to enable the "third hand" function.