Metrology device and a method for compensating for bearing runout error
US9423282B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 2015 |
| Grant date | Aug 23, 2016 |
| Priority date | — |
| Expiry date | Jun 3, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and method for determining the angular position of a bearing assembly and compensating measurements for bearing runout error in metrology devices, such as an articulated arm coordinate measurement device and a laser tracker, is provided. The system and method includes measuring the bearing runout error and defining a waveform from encoder readings for a first set of rotations. In one embodiment, a transfer function is created based on an analysis of the bearing runout error, such as with a Fourier analysis for example. In another embodiment the bearing runout error is mapped to an absolute angular position. During operation, the angular position of the bearing assembly is determined by comparing a waveform to the waveform from the first set of rotations. With the angular position determined, the bearing runout error may be used to compensate the measurements of the metrology device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.