Patents by Inventor HOLGER KRETSCHMAR

HOLGER KRETSCHMAR has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210220957
    Abstract: A machine tool holding workpieces has measuring probes disposed on spindles. The spindles move in common relative to the workpieces until a termination criterion is reached for the common displacement movement. During the common displacement movement, a position of a measuring probe relative to a respective workpiece is detected where the measuring probe makes contact with the respective workpiece or loses contact with the respective workpiece, allowing geometric statements about the respective workpiece to be derived. The measuring probes are kept at a rest position relative to their respective spindle during the common displacement movement, as long as the respective measuring probe does not yet make contact with the respective workpiece. Following contact with the respective workpiece, a deflection from a rest position is detected. The termination criterion is satisfied as soon as the deflection of at least one of the measuring probes reaches a maximum deflection.
    Type: Application
    Filed: May 15, 2019
    Publication date: July 22, 2021
    Applicant: Siemens Aktiengesellschaft
    Inventors: PATRICK KUNZE, HOLGER KRETSCHMAR
  • Patent number: 8700203
    Abstract: Four basic measurements are performed when calibrating a spherical measurement probe fastened to a tool spindle having a fixed longitudinal position along the spindle axis. Moving the measurement probe transversely towards the calibration sphere yields a basic position of the tool spindle relative to an element with an attached calibration sphere, when measurement probe touches the calibration sphere. The measurement probe is rotated about the spindle axis from one basic measurement to the next by the same angle, whereas the orientation of the calibration sphere is maintained for all four basic measurements. Based on the basic positions, a reference position of the tool spindle relative to the element, at which the tool spindle is located above the calibration sphere and the spindle axis goes through a central point of the calibration sphere, is determined and taken into account in further calibration of the measurement probe.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: April 15, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Andreas Haase, Holger Kretschmar
  • Publication number: 20130151001
    Abstract: Four basic measurements are performed when calibrating a spherical measurement probe fastened to a tool spindle having a fixed longitudinal position along the spindle axis. Moving the measurement probe transversely towards the calibration sphere yields a basic position of the tool spindle relative to an element with an attached calibration sphere, when measurement probe touches the calibration sphere. The measurement probe is rotated about the spindle axis from one basic measurement to the next by the same angle, whereas the orientation of the calibration sphere is maintained for all four basic measurements. Based on the basic positions, a reference position of the tool spindle relative to the element, at which the tool spindle is located above the calibration sphere and the spindle axis goes through a central point of the calibration sphere, is determined and taken into account in further calibration of the measurement probe.
    Type: Application
    Filed: February 21, 2012
    Publication date: June 13, 2013
    Applicant: Siemens Aktiengesellschaft
    Inventors: ANDREAS HAASE, HOLGER KRETSCHMAR