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Measurement method with improved measurement point acquisition precision

A technology of measuring points and measuring arms, which is applied in the field of coordinate metrology and can solve problems such as inaccuracy

Active Publication Date: 2016-10-05
HEXAGON METROLOGY SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Therefore, when moving from one measurement point to another, inaccuracies from all sources will be accumulated, so that in the determination of the coordinates of the measurement point and thus the geometrical characteristics expected to be measured (such as the difference between the measurement points) Overall imprecision

Method used

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  • Measurement method with improved measurement point acquisition precision
  • Measurement method with improved measurement point acquisition precision
  • Measurement method with improved measurement point acquisition precision

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Embodiment Construction

[0035] refer to figure 1 , the articulated arm according to the invention (indicated generally by 1) comprises a fixed base 2 attached to a supporting element such as a table or the ground and bearing a vertical axis 3 on which it is rotatable Install bearing 4 securely. The first end of the first arm section 5 is hinged to the bearing 4 by a horizontal axis pivot link 6 . The second end of the first arm section 5 receives a second arm section 7 articulated at one of its ends about a horizontal axis pivot 8 . The other end of the second section 7 of the measuring arm 1 receives a pointer head 9 , in this case a head with a probe 11 , which is also articulated about a horizontal axis pivot 10 . In this case, the measuring arm 1 is a manual arm, since it is moved by an operator moving the pointing head 9 and none of its joints are motorized. The vertical axis 3 and the respective arm sections 5 and 7 have stiffnesses K3 , K5 and K7 , respectively, which were established when ...

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PUM

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Abstract

The invention discloses a measurement method with improved measurement point acquisition precision. The method uses an articulated measurement arm (1) for measuring a part. The articulated measurement arm (1) is provided with a measurement head (9) with a pointing component and at least one joint with at least one rotary coder (12, 13, 14, 15). The method comprises the following steps: focusing on the first measurement point on the part, the measurement arm (1) adopts a first measurement position; the measurement arm (1) moves to a second measurement position to focus on the second measurement point of the part to acquire geometric features of the part based on the measurement points; and the geometric feature acquisition accuracy by the measurement arm according to the first position and the second position is determined. The articulated measurement arm (1) can execute the method of the invention.

Description

technical field [0001] The present invention relates to the field of coordinate metrology, and more particularly to three-dimensional measuring arms. Background technique [0002] A three-dimensional measuring machine is a measuring instrument used in dimensional metrology designed to capture the coordinates of different points of a part to be measured, for example to check the conformity of the part's dimensions, geometry and / or shape sex. [0003] These machines generally comprise a base on which is mounted a measuring arm with a measuring head at the end of the measuring arm. Measuring arms typically comprise rigid segments linked together, for example using pivots and / or ball joints provided with encoders that precisely measure the movement of the segments relative to each other. The measuring head has means for capturing points on the object to be measured. [0004] There are two main types of measuring heads, which are distinguished by whether the measurement is mad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/00
Inventor L·德福奇
Owner HEXAGON METROLOGY SPA