Method and machine for determining a space coordinate of a measurement point on a measurement object
AssigneeCarl Zeiss Industrielle Messtechnik GmbH
InventorGuenter Grupp
Life of this patent
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Abstract
For determining a space coordinate of a measurement point on a measuring object, the measurement point is approached with a probe head arranged on a displacement mechanism having at least two supports movable parallel to one another. Each support is moved by its own drive. The space coordinate of the measurement point is determined as a function of the respective displacement position of the supports. The two drives are controlled by a common regulator.
Claims19
A method for determining at least one space coordinate of a measurement point on an object to be measured, comprising the steps of
- providing a probe head arranged on a displacement mechanism which comprises a first and a second support movable parallel to one another along a first axis, the first support being actuated by a first drive and the second support being actuated by a second drive mechanically separate from said first drive, for moving said displacement mechanism along said first axis,
- approaching the measuring point with the probe head,
- determining a first displacement position of the first support and determining a second displacement position of the second support,
- determining an actual difference value representative of an actual difference between the first and second displacement positions,
- providing a static difference value which represents a long-term static difference between the first and second displacement positions,
- subtracting the static difference value from the actual difference value in order to obtain a dynamic difference value, and
- determining the space coordinate of the measurement point as a function of at least one of the first and second displacement positions,
- wherein the two drives are controlled by a common regulator which generates a separate drive signal having associated therewith a separate setpoint value for each of said first and second drives as a function of the dynamic difference value.
A method for determining at least one space coordinate of a measurement point on an object to be measured, comprising the steps of
- approaching the measuring point with a probe head arranged on a displacement mechanism which comprises a first and a second support movable parallel to one another, the first support being actuated by a first drive and the second support being actuated by a second drive,
- determining a first displacement position of the first support and a second displacement position of the second support, and
- determining the space coordinate of the measurement point as a function of at least one of the first and second displacement positions,
- wherein the two drives are controlled by a common regulator which generates a separate setpoint value for each drive, and
- wherein the common regulator comprises a common rotary speed regulator for the first and second drives, to which an average rotary speed value of the first and second drives is supplied as an actual rotary speed.
A coordinate measuring machine for determining a space coordinate of a measurement point on an object to be measured comprising
- a displacement mechanism having a first and a second support movable parallel to one another along a first axis,
- a probe head arranged on the displacement mechanism for approaching the measuring point,
- a first drive for moving the first support along said first axis and a second drive mechanically separate from said first drive for moving the second support along said first axis,
- a first and a second measuring instrument for determining a first displacement position of the first support and for determining a second displacement position of the second support,
- a first subtractor for determining an actual difference value representing an actual difference between the first and second displacement positions,
- a memory providing a static difference value representing a static difference between the first and second displacement positions,
- a second subtractor for subtracting the static difference value from the actual difference value in order to obtain a dynamic difference value,
- a common regulator configured to control the first and second drives, and
- a calculation unit for determining the space coordinate as a function of at least one of the first and second displacement positions,
- wherein the common regulator is configured to generate a separate drive signal having associated therewith a separate setpoint value for each of said first and second drives as a function of the dynamic difference value.
Dependencies are inferred from the claim text.