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Patent EP0420416A2 successfully refreshed from Google Patents.
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EP0420416A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method and apparatus of datuming a coordinate positioning machine

Assignee: Renishaw PLC
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Filing: 1990-08-29
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Granted: —
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Expires: 2010-08-29
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Abstract

Abstract A datuming device (50) is provided for use on a coordinate measuring machine to calibrate a touch trigger probe (14). The device (50) comprises an artefact (52) supported on the bed 12 of the machine, the dimensions of the artefact (52) being precisely known. A piezo electric array (56) is provided to determine the instant of contact of the stylus (16) of the touch trigger probe (14) with the artefact (52). A processing circuit (70) detects a signal produced by the piezo array (56) and produces a step output (V1); a further circuit combines the output (V1) with the ouput (V2) from a circuit (32) (for processing the output of the probe (14)), and generates a further output (VP) corresponding to the delay between generation of the outputs (V1) and (V2). The further output (Vp) yields a value for the pretravel of the probe, and provides easy error mapping of the probe.

Inventors

  • 👤 Peter George Lloyd
  • 👤 David Wilson

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 03:51
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/004; G01B7/008; G01B7/012; G01B21/00; G01B21/02; G01B21/04; G01B21/045; G01B7/002

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 61 words
A datuming device (50) for use on a coordinate positioning machine, comprising an artefact (52) and a support (54) for supporting the artefact (52) on a bed (12) of the machine, characterised by a sensor (56) coupled to the device (50), for sensing strain and/or vibration excited in the device (50) upon contact of an object (30) with the artefact (52).
Claim 2
Dependent Claim 61 words
A datuming device (50) for use on a coordinate positioning machine, comprising an artefact (52) and a support (54) for supporting the artefact (52) on a bed (12) of the machine, characterised by a sensor (56) coupled to the device (50), for sensing strain and/or vibration excited in the device (50) upon contact of an object (30) with the artefact (52).
Claim 3
Dependent Claim 46 words
A device according to claim 1 wherein the support (54) comprises two parts (54A,54B), the sensor (56) comprises at least one element (56A,56B) sensitive to tension and compression, and said at least one element (56A,56B) is clamped between the two parts (54A,54B) of the support (54).
Claim 4
Dependent Claim 37 words
A device according to claim 1 wherein the sensor (56) comprises at least one element (56A,56B) sensitive to tension and compression, and said at least one element (56A,56B) is clamped between the artefact (52) and support (54).
Claim 5
Dependent Claim 21 words
A device according to claim 2 or claim 3 wherein said at least one element (56A,56B) is a piezo electric element.
Claim 6
Dependent Claim 19 words
A device according to claim 2 or claim 3 wherein said at least one element is a strain gauge.
Claim 7
Independent Claim 21 words
A device according to any one of the preceding claims wherein the artefact (52) has a precisely known geometry and dimensions.
Claim 8
Independent Claim 92 words
A device according to any one of the preceding claims, in combination with a circuit for processing a sensing signal from said sensor (56), and a signal from a touch probe, the circuit comprising: first detecting means (70) for detecting said sensing signal, and for generating a first detection signal (V1) second detecting means (32) for detecting said probe signal, and for generating a second detection signal (V2); and means for generating an output (Vp) corresponding to the time interval between the generation of the first (V1) and second (V2) detection signals.

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