Carl-zeiss-stiftung

Carl Zeiss Industrielle Messtechnik Gmbh

Ralf Bernhardt

Dominik Seitz

Tobias Held

Otto Ruck

Gunter Grupp

Guenter Grupp

Günter Grupp

Wolfgang Wiedmann

Eugen Aubele

Volker Piwek

Klaus Jacobs

Franz Woletz

Klaus Bendzulla

Rainer Sagemueller

Franz Szenger

Walter Jenisch

Werner Lotze

Ulrich Staaden

Andreas Fuchs

Berndt Kammleiter

Jochen Burger

Werner Leitenberger

Kai Schäffauer

Rainer Sagemüller

Martin Wimmer

Udo Gruber

Ronald Lonardoni

Walter Puntigam

Eugen Trapet

Henning Schon

Uwe Wiegand

Harald Schmid

Niko Maier

Mark Herter

Gerd Moser

G&uuml;nter Grupp

Sven Philipp

A method is described for determining a relative position of an axis of rotation of a rotary table of a coordinate measuring machine. The rotary table has or forms a reference element that is arranged eccentrically in relation to the axis of rotation. The method includes a measuring step including performing a rotary movement of the rotary table, and producing measuring points that encode a position of the reference element by a sensor of the coordinate measuring machine during the rotary movement. The method includes a determining step including determining the relative position of the axis of rotation of the rotary table based on the measuring points.

Method and apparatus for determining a relative position of an axis of rotation of a rotary table for a coordinate measuring machine

A coordinate measuring machine comprising a movable part, a drive and drive controller, and a position measuring system for measuring position values of the movable part. Intended values produced by the drive controller are supplied to a computational model (MOD) of a computational device. The intended values respectively predetermine an intended state of the drive. Position deviations (&#x394;s) are formed between the measured position values (s) and position estimates of the computational model (MOD). The position estimates are produced by the computational model (MOD) for a predetermined location at the movable part. Acceleration values are measured by an acceleration sensor arranged at a location at the movable part. Acceleration deviations (&#x394;a) are formed between the measured acceleration values (a) and acceleration estimates of the computational model (MOD). During the operation of the coordinate measuring machine, the position deviations (&#x394;s) and the acceleration deviations (&#x394;a) are supplied to the computational model (MOD), which outputs updated position estimates (&#x15d;) and updated acceleration estimates (&#xe2;), accordingly. The position of the movable part is determined by the updated position estimates (&#x15d;).

Determining a position of a movable part of a coordinate measuring machine

A coordinate measuring machine including a workpiece support for mounting a workpiece to be measured; a mechanism for moving a sensor in a first coordinate direction and a second coordinate direction perpendicular thereto. The mechanism includes: a first measurement slide guided in the first coordinate direction along two parallel guides arranged on opposite sides of the workpiece support. The first measurement slide spans the support. The first slide is driven via a first drive, which drives the first slide along a first guide of the guides, and is driven via a second drive, which drives the first slide along the second of the guides; a second measurement slide guided movably in the second coordinate direction along the first measurement slide. The second slide is assigned a position measuring system, via which the position of the second measurement slide relative to the first measurement slide can be determined; a controller, which actuates the first and second drive. The controller includes a force feedforward control, which, depending on the detected position (x) of the second measurement slide and depending on a setpoint acceleration (a) to be set of the first measurement slide, brings about an actuation of the first drive and/or of the second drive in such a way that the torques which as a result of the acceleration of the first measurement slide by the first drive and by the second drive relative to a rotation axis (R) which is perpendicular to the first and second coordinate directions at least partly or completely compensate for one another.

Coordinate measuring machine and method for operating a coordinate measuring machine

A coordinate measuring machine has a rotary table supporting a measurement object, a measuring head including a measuring element and a frame, on which the measuring head is arranged. The frame has first, second and third frame parts moveable relative to the workpiece holder along first, second and third movement axes, respectively. The measuring element is mounted via at least one fluid bearing, such as an air bearing, on one or more of the frame parts. The measuring head is positioned at a defined position along the first, second and third movement axes. Thereafter, the at least one fluid bearing is deactivated and the rotary table rotated around a further axis while the measuring head, using the measuring element, records current measured values. A shape contour of the object is determined on the basis of the measured values recorded while the at least one fluid bearing was selectively deactivated.

Method and machine for determining a shape contour on a measurement object

A method for operating a coordinate measuring machine or a machine tool. A movement of a machining part is controlled in such a way that, during the movement of the machine part, a predetermined maximum acceleration and/or a predetermined maximum jerk is not exceeded. The maximum acceleration and/or the maximum jerk is varied depending on the position of the machine part and/or depending on the alignment of the machine part.

Operation of a coordinate measuring machine

The present invention relates to a method for controlling a measurement process of a coordinate measuring machine for measuring a measurement object, wherein the coordinate measuring machine comprises a controlling device and a feeler head having a feeler pin, and wherein a relative movement between the feeler pin and a surface of the measurement object is controlled by the controlling device. Furthermore, the surface comprises at least one actual section, which corresponds to a measurement object surface, and at least one virtual section. The present invention also relates to a corresponding coordinate measuring machine and computer program.

Method for controlling a measurement process by means of virtual surfaces

A probe head having a probe head base and a stylus is provided for contacting a surface point on a workpiece. The stylus is moveable relative to the probe head base and has a defined rest position relative to the probe head base. For the contacting, the probe head is moved relative to the workpiece until the stylus touches the surface point with a defined contacting force. A correction data record representing a hysteresis behavior of the stylus with respect to the rest position is provided, and the contacting force is determined using the correction data record.

Method and device for contacting a surface point on a workpiece

A method for correcting errors in a coordinate measuring machine having a measuring head which is adapted to move in at least two different spatial directions. Measuring scales and measuring lines are assigned to each spatial direction. The measuring lines of different spatial directions intersect, and correction values are determined along the measuring lines at predetermined values of the scales in order to correct for elastic and/or geometric errors of the scales and/or of the guiding mechanism for moving the measuring head. According to one aspect of the invention, the correction values determined along a measuring line of a first spatial direction are modified such that the modified correction value of this measuring line assumes a predetermined value at the point of intersection with a first measuring line of a second spatial direction.

Method and device for correcting guiding errors in a coordinate measuring machine

The invention is directed to a method for determining the weight of a probe of a coordinate measuring machine wherein the probe is connected to a probe head ( ) of the machine. The machine includes a control unit and the weight of the probe ( ) is preferably statically determined without active control of the movement of the probe. Signals from the probe ( ) and/or the probe head ( ) are supplied to the control unit ( ).

Method for determining the weight of a probe of a coordinate measuring machine

The invention is directed to a method for correcting the measuring results of a coordinate measuring apparatus wherein a workpiece is continuously scanned. The dynamic bending characteristic of the probe is determined or a multidimensional parameter field especially as a dynamic tensor (D). Corrective values are computed from the parameter field D while considering the acceleration of the probe ({right arrow over (b)}). Then, the measuring results are corrected with corrective values. To improve the accuracy of the method, the parameter field is the product of the static bending tensor (N ) of the probe and the mass tensor (M &plus;mE) of the probe and/or the parameter field describes the deviations normal to the workpiece surface by accelerating the probe.

Correction method for a coordinate measuring apparatus

In a seal arrangement for a load-carrying bearing which is supported on a guide path provided on a carrying body and which is arranged so as to be movable along the length of the guide path, especially for coordinate measuring devices, the bearing is connected with a bearing cover. The bearing cover spans the carrying body at least on one side thereof and has a side portion which is bent toward its side, each side portion projecting into a labyrinth recess which is arranged on the associated side of the carrying body over the entire length of the guide path to form a labyrinth seal.

Seal arrangement for a load-carrying bearing, particularly for coordinate measuring devices

The invention is directed to a coordinate measuring apparatus in bridge configuration wherein a bridge spanning the measuring pad is guided on two guides laterally of the measuring pad. To avoid measurement errors, which are caused by different warming of the coordinate measuring apparatus, the guides are mounted on the support rods which have a low thermal coefficient of expansion and the support rods are arranged in a support structure.

Coordinate measuring apparatus having a bridge configuration

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).

Coordinate measuring apparatus and method for controlling the same

The invention is directed to a method for controlling a coordinate measuring apparatus wherein the probe head (2) and the probe pin (19) of the apparatus are control driven in accordance with desired data Pi. The probe pin (19) is movably attached to the probe head (2). In the method, the probe pin for measuring the workpiece (15) can touch down on the surface of the workpiece to be measured or can be lifted off of this surface. The speed of measurement is increased by selecting the angle (.alpha.down, .alpha.up) between the direction of movement vres of the probe head (2) when touching down or when lifting off and the projection of the direction of movement toward the plane tangential to the workpiece surface in the touchdown/liftoff point (Pdown, Pup) to be less than 30.degree..

The invention is directed to a coordinate measuring apparatus wherein the drives (3, 5, 6) for the measuring sleds of the apparatus are controlled on circularly-shaped paths to machine-control adjust the spatial orientation of the probe pin 9. The probe pin is attached to a passive rotation-pivot joint and has a probe ball which is driven into one of several centering gaps of a body 10. In this way, a separate drive for the rotation-pivot joint 8 is not needed.

Growing community of inventors

Aalen, Germany

Ralf Bernhardt