Coordinate measuring apparatus and method for controlling the same
First Claim
1. A method for controlling a coordinate measuring apparatus including a control system and a probe head having a probe unit movably attached thereto, the method comprising the steps of:
- control driving said probe head and said probe unit along a path for measuring a workpiece having a surface whereby mass inertial forces are developed because of an acceleration of said probe unit along said path;
forming a desired measuring force (Fdes) which is constant in magnitude and is directed perpendicularly to said surface;
generating a corrective measuring force (Fcorr) for at least partially compensating said mass inertial forces (Ftr, Fzp);
forming a measuring force (Fmeas) from said desired measuring force (Fdes) and said corrective measuring force (Fcorr); and
,applying said measuring force (Fmeas) to said probe unit relative to said probe head.
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Accused Products
Abstract
The invention is directed to a method which is provided for controlling coordinate measuring apparatus wherein a probe head (2) is moved and has a movably attached probe unit (24) attached thereto. The probe unit (24) is charged with a measurement force Fmeas relative to the probe head (2). The measurement force Fmeas operates against the mass inertial forces Fzp which occur because of acceleration of the probe. The measurement force Fmeas is comprised of a desired measurement force Fdes and a corrective measurement force Fcorr. The desired measurement force Fdes is constant in magnitude and is directed perpendicularly to the surface of the workpiece (15) to be measured. The corrective measurement force Fcorr at least partially compensates for the mass inertial forces (Ftr, Fzp) which occur because of the acceleration of the probe unit (24).
34 Citations
10 Claims
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1. A method for controlling a coordinate measuring apparatus including a control system and a probe head having a probe unit movably attached thereto, the method comprising the steps of:
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control driving said probe head and said probe unit along a path for measuring a workpiece having a surface whereby mass inertial forces are developed because of an acceleration of said probe unit along said path; forming a desired measuring force (Fdes) which is constant in magnitude and is directed perpendicularly to said surface; generating a corrective measuring force (Fcorr) for at least partially compensating said mass inertial forces (Ftr, Fzp); forming a measuring force (Fmeas) from said desired measuring force (Fdes) and said corrective measuring force (Fcorr); and
,applying said measuring force (Fmeas) to said probe unit relative to said probe head. - View Dependent Claims (2, 3, 4)
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5. A coordinate measuring apparatus for measuring a workpiece having a surface, the coordinate measuring apparatus comprising:
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a probe head having a probe unit attached thereto; a control system for control driving said probe head and said probe unit along a path for measuring said workpiece whereby mass inertial forces occur because of an acceleration of said probe unit along said path; a first device for forming a desired measuring force (Fdes) directed perpendicularly to said surface and having a constant magnitude; said control system including a second device for determining a corrective measuring force (Fcorr) which at least partially compensates for said mass inertial forces (Ftr, Fzp); and
,said control system further including a third device for combining said desired measuring force (Fdes) and said corrective measuring force (Fcorr) to form a measuring force (Fmeas) and for adjusting the application of said measuring force (Fmeas) to said probe unit relative to said probe head. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification