Method for controlling a coordinate measuring in accordance with desired data

A coordinate measuring apparatus for scanning a workpiece in accordance with desired data, the coordinate measuring apparatus comprising:

• a movably guided probe which measures the surface of a workpiece in a scanning point in a definable preferred measurement direction (M);
• at least one rotation unit via which said workpiece and/or said probe are rotated about a rotational axis with a first alignment;
• and,
• a control which determines control data on the basis of geometric data, said control data being for controlling the measuring sequence from said geometric data in such a manner that, for measuring the workpiece, the workpiece and/or said probe are rotated about the rotational axis;
• and, said geometric points (Pai, Pbi) include the points which define the line to be scanned.

A method for controlling a coordinate measuring apparatus in accordance with desired data utilizing a movably journalled probe which continuously scans the surface of a workpiece in a scanning point in a preferred measurement direction (M), either the probe or the workpiece being additionally rotatably journalled about at least one rotational axis having a first alignment, the method comprising the steps of:

• processing geometric data which include at least points (Pai, Pbi) on the surface of said workpiece with said points (Pai, Pbi) defining a line to be scanned;
• computing control data (Lai, L.alpha.i and/or Lbi, L.beta.i) from said geometric data for controlling the measuring sequence in such a manner that, for measuring the workpiece, said workpiece and/or said probe are rotated about the rotational axis;
• wherein a projection of said preferred measurement direction (M) is on a normal plane, which lies orthogonal to the rotational axis;
• and a projection of a normal vector (Nai, Nbi) which stands normally to the surface on the workpiece in the scanning point on said normal plane;
• and, said projections conjointly define a scan angle;
• and,
• adjusting said scan angle for each point by suitable rotation of the probe and/or by suitable rotation of said workpiece.

A coordinate measuring apparatus for scanning a workpiece in accordance with desired data, the coordinate measuring apparatus comprising:

• a movably guided probe which measures the surface of a workpiece in a scanning point in a definable preferred measurement direction (M);
• at least one rotation unit via which said workpiece and/or said probe are rotated about a rotational axis with a first alignment;
• a control which determines control data on the basis of geometric data, said control data being for controlling the measuring sequence from said geometric data in such a manner that, for measuring the workpiece, the workpiece and/or said probe are rotated about the rotational axis;
• and, said geometric points (Pai, Pbi) include the points which define the line to be scanned;
• said preferred measurement direction (M) forming a projection thereof on a normal plane, which lies orthogonal to the rotational axis;
• a normal vector (Nai, Nbi) defining a projection thereof in the scanning point standing normally to the surface of the workpiece;
• and, said projections conjointly defining a scan angle;
• and,
• the control data being so generated that said probe angle is adjusted for each point by suitable rotation of the probe and/or by suitable rotation of said workpiece.