Process and device for determining the alignment of two rotatable machine parts, the alignment of two hollow cylindrical machine parts or for testing a component for straightness along a lengthwise side

Process for determining the alignment of two hollow cylindrical machine parts with a first measurement unit with a light source for emitting a light beam which has been expanded in one plane, and a second measurement unit with an optical detector unit which comprises two linear sensors which are arranged parallel to one another, comprising the steps of:

• mounting the first measurement unit in a first of the machine parts axially parallel thereto and the second measurement unit in a second of the machine parts axially parallel thereto,
• emitting a light beam which is expanded in two dimensions parallel to a longitudinal axis of the first machine part so as to be incident on the detector unit,
• turning at least one of the measurement units axially parallel to said longitudinal axis and during rotation of said at least one of the measurement units, evaluating a light pattern which has been produced by the two-dimensionally expanded light beam for determining the misalignment of the axes of the machine parts relative to one another, by evaluating misalignment of the points of incidence of the two-dimensionally expanded light beam on the sensors.

Process for testing a component for straightness along a lengthwise side thereof using a first measurement unit with a light source for emitting a light beam which has been expanded in one plane, and a second measurement unit with an optical detector unit having two linear sensors which are located parallel to one another, comprising the steps of:

• moving at least one of the measurement units along the lengthwise side and
• evaluating a light pattern produced by the two-dimensionally expanded light beam on the detector unit.

Device for determining the alignment of two rotatable machine parts, the alignment of two hollow cylindrical machine parts or for testing a component for straightness along a lengthwise side thereof, comprising:

• a first measurement unit with a light source for emitting a light beam which has been two-dimensionally expanded in one plane,
• a second measurement unit with an optical detector unit having two linear sensors which are located parallel to another, and
• an evaluation unit for evaluating a light pattern produced by the two-dimensionally expanded light beam for determining one of misalignment of the axes of the machine parts relative to one another, and straightness of the component, on the basis of points of incidence of the two-dimensionally expanded light beam on the sensors.