Abstract
A coordinate measuring method with two operation modes, based on the adjustable articulated arms, is proposed to keep measurement capability in global space and improve the measurement precision in local space. The adjustable articulated arm coordinate measuring machine (AACMM) with an electromagnetic locking device can automatically switch between the all-free articulated arms operation mode and the partially bound articulated arms operation mode. In the former mode, three arms and six articulations can freely move and measure the coordinates of any point in global space. In the latter mode, the front two articulations are locked to improve the measurement precision by decreasing the importation of angle errors in the local space. A prototype of the adjustable AACMM has also been designed and developed. A mathematical model for the adjustable AACMM has been built. Theoretical analysis and numerical simulation show that the partially bound AACMM performed much better than the all-free AACMM in single point repeatability and length measurement precision in the local space. Therefore, the proposed coordinate measuring method based on the adjustable articulated arms is verified as being effective.
Highlights
The coordinate measuring machine has been applied extensively as a key precise tool for guaranteeing product quality in the automobile and ship manufacturing industries.[1,2] the traditional orthogonal coordinate measuring machine has high measurement precision, its usage in onsite applications is extremely limited by its complex structure, high cost, and strict ambient demands
This paper presents a coordinate measuring method based on the adjustable articulated arms
A coordinate measuring method with two operation modes based on the adjustable articulated arms is proposed
Summary
The coordinate measuring machine has been applied extensively as a key precise tool for guaranteeing product quality in the automobile and ship manufacturing industries.[1,2] the traditional orthogonal coordinate measuring machine has high measurement precision, its usage in onsite applications is extremely limited by its complex structure, high cost, and strict ambient demands. The AACMM has a large measurement space, most measurement tasks in real applications are limited in a local space, where some, but not all, of the arms and articulations are needed to move In those cases, decreasing the system’s degrees of freedom of motion obviously can reduce the importation of errors and improve the measurement precision significantly. From this point of view, the contribution of this paper is not to make an improvement in structural design or model calibration, but to break the current measurement mode of the AACMM. This measurement method will maintain the measurement capability in global space and improve the measurement precision in local space
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