Method for sawing a long profile and machine for cutting same to length

1. Method for sawing a long profile ( 3 ) in that a sawing disc ( 2 ) having teeth ( 6 ) arranged around a circular outer circumference of the sawing disc ( 2 ) is rotated freely, the sawing disc ( 2 ) is advanced from a freely rotating position to an outer wall of the long profile ( 3 ), and a zero tooth (Z 1 , Z 2 , Z 3 , Z 4 ) engages as the first of the teeth ( 6 ) in the material of the outer wall, characterised in that during the free rotation of the sawing disc ( 2 ), lateral runouts (d) of the teeth ( 6 ) are determined, and a tooth ( 6 ) having a minimum lateral runout (d) is determined and used as the zero tooth (Z 1 , Z 2 , Z 3 , Z 4 );

wherein the lateral runouts (d) of the teeth ( 6 ) are continuously measured during the rotation relative to a distance sensor ( 4 ) in a fixed position and angular positions (α) of the saw disc ( 2 ) are continuously measured, a lateral runout angular position profile of the sawing disc ( 2 ) is determined and a tooth ( 6 ) with minimal lateral runout (d) is determined from the lateral runout angular position profile.

2. Method according to claim 1 , characterised in that an advance and the rotation of the sawing disc ( 2 ) are controlled in such a way that the tooth ( 6 ) with minimal lateral runout (d) becomes the zero tooth (Z 1 , Z 2 , Z 3 , Z 4 ).

3. Method according to claim 1 , characterised in that a zero position of the sawing disc ( 2 ) is determined.

4. Method according to claim 1 , characterised in that after the sawing, a tooth ( 6 ) with minimal lateral runout (d) is determined and is used as the zero tooth (Z 1 , Z 2 , Z 3 , Z 4 ) before each subsequent sawing of a further long profile.

5. Method according to claim 1 , characterised in that a subsequent zero tooth (Z 1 , Z 2 , Z 3 , Z 4 ) spaced furthest apart from the zero tooth (Z 1 , Z 2 , Z 3 , Z 4 ) of the sawing operation is determined for subsequent sawing.

6. Machine for cutting sections of a long profile ( 3 ) to length, comprising a receptacle for the long profile ( 3 ); a sawing disc ( 2 ) with teeth ( 6 ) arranged around a circular outer circumference of the sawing disc ( 2 ); an advancing direction (V) for the sawing disc ( 2 ) in the direction of the receptacle ( 1 ), characterised in that, laterally along an axis of rotation alongside the teeth ( 6 ) of the sawing disc ( 2 ) there is arranged a distance sensor ( 4 ), which is directed towards the teeth ( 6 ) of the sawing disc ( 2 ) and measures lateral runouts (d) of the teeth ( 6 ) during the free rotation of the sawing disc ( 2 ), and an evaluation unit which is connected to the distance sensor ( 4 ) by which measured values from the distance sensor ( 4 ) can be supplied to the evaluation unit; and an angle measuring device for a rotational position of the sawing disc ( 2 ) which is connected to the evaluation unit and by which a lateral runout angular position profile of the sawing disc ( 2 ) can be determined and by which a zero tooth (Z 1 , Z 2 , Z 3 , Z 4 ) can be determined.

7. Machine according to claim 6 , characterised by a control for the rotation and the advancing of the sawing disc ( 2 ) which makes it possible to select the zero tooth (Z 1 , Z 2 , Z 3 , Z 4 ) as first tooth ( 6 ) which engages in the material of the outer wall of the long profile ( 3 ).

8. Machine according to claim 6 , characterised in that a control makes it possible for a subsequent zero tooth (Z 1 , Z 2 , Z 3 , Z 4 ) spaced furthest apart from the zero tooth (Z 1 , Z 2 , Z 3 , Z 4 ) of the sawing to be determined for subsequent sawing.