COORDINATE MEASUREMENT MACHINE WITH VIBRATION DETECTION

• US 20100325907A1
• Filed: 06/28/2010
• Published: 12/30/2010
• Est. Priority Date: 06/30/2009
• Status: Active Grant

• Current Assignee: Hexagon Technology Center GmbH (Hexagon AB)
• Original Assignee: Hexagon Metrology AB (Hexagon AB)
• Inventors: Tait, Hogar
• Granted Patent: US 8,104,189 B2
• Time in Patent Office: Days
• US Class Current: 33/503
• CPC Class Codes: G01B 5/008 using coordinate measuring machines
• CPC Class Codes: G01H 1/16 Amplitude

Abstract

An articulated arm system can include an articulated measuring arm with a plurality of interconnected support arm segments. The arm segments can be moveable about a plurality of axes. A plurality of rotational angle sensors can mount on the arm and be configured to measure rotational position between the support arm segments. Additionally, a vibration detection device can attach to the arm near an end of the arm. The vibration detection device can be operatively connected to the sensors such that the sensors output a rotational position upon detection of a new vibration exceeding a threshold amplitude.

Claims

1. A articulated arm system comprising:

an articulated measuring arm comprising a plurality of interconnected support arm segments moveable about a plurality of axes;

a plurality of rotational angle sensors mounted on the articulated measuring arm configured to measure rotational position between the support arm segments; and

a vibration detection device attached to the articulated measuring arm near an end of the articulated measuring arm, the vibration detection device being operatively connected to the sensors such that the sensors will output a rotational position upon detection of a new vibration exceeding a threshold amplitude.

2. The system of claim 1, further comprising a coordinate acquisition member at an end of the articulated measuring arm.

3. The system of claim 2, wherein the vibration detection device is disposed on the coordinate acquisition member.

4. The system of claim 2, wherein the coordinate acquisition member comprises a hard probe.

5. The system of claim 4, wherein the coordinate acquisition member further comprises a device for detecting position and/or contact distinct from the vibration detection device.

6. The system of claim 1, wherein at least one of the sensors is an optical encoder.

7. The system of claim 1, wherein the vibration detection device is disposed on the articulated measuring arm.

8. The system of claim 2, wherein the coordinate acquisition member is removable.

9. The system of claim 2, wherein the vibration detection device is disposed within the coordinate acquisition member.

10. The system of claim 4, wherein the vibration detection device is disposed within the hard probe.

11. The system of claim 2, wherein the vibration detection device is rigidly attached to the coordinate acquisition member.

12. The system of claim 1, wherein the vibration detection device is an accelerometer.

13. The system of claim 3, wherein the coordinate acquisition member comprises a probe tip and the vibration detection devices is disposed within the probe tip.

14. A method of operating an articulated arm system comprising:

contacting an item to be measured with an articulated measuring arm comprising a plurality of interconnected support arm segments moveable about a plurality of axes;

sensing a new vibration at an end of the measuring arm upon contact with the item;

generating a triggering signal in response to the new vibration; and

automatically measuring a position of the end of the measuring arm in response to the triggering signal.

15. The method of claim 14, wherein the triggering signal indicates contact with the item.

16. The method of claim 14, further comprising the step of storing the measured position.

17. The method of claim 14, wherein the step of measuring further comprises storing the measured position.

18. The method of claim 14, wherein the step of automatically measuring is performed with an electronic encoder.

19. The method of claim 14, further comprising the step of determining whether a sensed new vibration indicates contact with the item.

20. The method of claim 19, wherein the step of determining further comprises checking for a threshold amplitude.

21. The method of claim 19, wherein the step of determining further comprises checking for a minimum duration of an acceleration.

22. The method of claim 19, wherein the step of determining further comprises checking for a maximum duration of an acceleration.

23. The method of claim 19, wherein the step of determining further comprises ignoring vibrations during periods of substantially continued high vibrations.

24. The method of claim 19, wherein the step of determining further comprises checking for passage of a cooldown duration.

25. A probe configured for use with a coordinate measurement machine comprising:

a probe tip comprising an accelerometer;

a probe neck connecting the probe tip to a probe body; and

a mounting portion configured to mount the probe body to a coordinate measuring machine, the mounting portion comprising a connect device and a data port.

26. The probe of claim 25, wherein the accelerometer and data port are configured to output a trigger signal upon detection of a new vibration exceeding a threshold amplitude.

27. The probe of claim 25, further comprising a device for detecting position and/or contact distinct from the accelerometer.

28. The probe of claim 25, wherein the probe tip is a hard probe tip.