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Method of error compensation in a coordinate measuring machine with an articulating probe head

An error compensation and articulation technology, applied in the field of error compensation of coordinate measuring instruments with articulated probes, can solve the problems of increasing the mass, complexity and cost of articulated probes

Active Publication Date: 2006-12-20
RENISHAW PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach to inertial balancing of articulating probes has the disadvantage that it adds mass, complexity and cost to articulating probes while only compensating for dynamic torque errors

Method used

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  • Method of error compensation in a coordinate measuring machine with an articulating probe head
  • Method of error compensation in a coordinate measuring machine with an articulating probe head
  • Method of error compensation in a coordinate measuring machine with an articulating probe head

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Experimental program
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Effect test

Embodiment Construction

[0043] figure 1 Shown is the articulating scan head mounted on a coordinate measuring machine (CMM). The articulating probe 10 is mounted on the bottom end of a vertically extending extension or Z-direction column 12 of the CMM 8 . The Z column 12 is supported for movement in the Z direction by bearings, such as air bearings 14 , which are integrated with a bracket 16 , which in turn is supported by a beam 18 for movement in the X direction. The beam 18 is supported by rails 20 mounted on a platform 22 for movement in the Y direction. The articulating probe 10 can thus be positioned anywhere in the X, Y and Z directions within the working volume of the instrument. The controller issues instructions to the CMM and articulating probe to position the articulating probe and probe mounted thereon in any desired position. The controller also receives feedback from the CMM, articulating probes and probes.

[0044] As shown in Figure 2, the articulating scanning probe 10 comprises...

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PUM

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Abstract

A method of error compensation for measurements taken using a co-ordinate positioning apparatus comprising an articulating probe head having a surface detecting device. The surface detecting device is rotated about at least one axis of the articulating probe head during measurement. The method comprises the steps of: determining the stiffness of the whole or part of the apparatus; determining one or more factors which relate to the load applied by the articulating probe head at any particular instant, and determining the measurement error at the surface sensing device caused by the load.

Description

technical field [0001] The present invention relates to a method of compensating for measurement errors of articulated probes that can be mounted on such devices as coordinate measuring machines (CMMs) (including parallel instruments such as tripods and hexapods). Coordinate positioning devices, as well as machine tools, manual coordinate measuring arms, robots such as work inspection robots, and single-axis instruments. Background technique [0002] After a workpiece is produced, it is common practice to inspect it on a coordinate positioning device such as a coordinate measuring machine (CMM), which has a movable arm mounted with a probe that can be The volume is driven in three orthogonal directions X, Y, Z. [0003] Acceleration of the probe causes dynamic deflection of the coordinate measuring machine, which in turn causes measurement errors. Measuring with low acceleration reduces these measurement errors. However, as the productivity needs increase, CMM is required...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/04G01B5/00
CPCG01B5/0016G01B21/045
Inventor 戴维·罗伯特·麦克默特里若弗雷·麦克法兰凯维恩·巴里·乔纳斯
Owner RENISHAW PLC
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