Metrology

Details Metrology Metrology

1990-10-12

1993-05-11

Raevis, Robert

Measuring and testing

Inspecting

33559, G01B 500

Patent

active

052091317

ABSTRACT:
A multiaxis measuring probe 10 for continuous measurement of workpieces (e.g. roundness, other form, or size measurment) has in one embodiment a stylus 50 suspended by resilient forces acting in opposition so as to determine an equilibrium rest position. This appears to improve the dynamic response/accuracy trade-off of the probe. The resilient forces are preferably provided by a diaphragm spring 40,140,210 and one or more opposing springs 80A,80B,180,214. The stylus 50 is preferably held magnetically to a stylus mount 34,134,206,208 via precision bearings, and the resilient forces act on the stylus mount. During calibration, a series of probe data is gathered from probe/sensor output signals at given positions of the probe along curved paths. A corresponding series of positional data for the given positions is gathered independently of the probe. A correlation is made between the probe data and the positional data so as to obtain calibration parameters for correction of measurement signals. These calibration parameters are stored with a measurement expression for later use with probe output signals to obtain corrected measurement signals.

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"Machine Checking Gauge", Renishaw PLC, p. 15 and XXI.
Coordinate Measuring Machines, British Standard, Part 3, Code of Practice.
Official letter and translation accompanying U.S.S.R. Patent No. 913031.

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