A technique for intrinsic and extrinsic calibration of a laser triangulation sensor (LTS) integrated in an articulated arm coordinate measuring machine (AACMM) is presented in this paper. After applying a novel approach to the AACMM kinematic parameter identification problem, by means of a single calibration gauge object, a one-step calibration method to obtain both intrinsic-laser plane, CCD s...

INTRODUCTION The diameter measurement of ring, plug and sphere is very important in dimensional metrology. The measurement of diameter is generally carried out by a comparison method using a ring gauge comparator. Recently the commercial comparators using laser interferometer or precision linear encoder were introduced. The accuracies of these instruments are larger than 0.5 μm. A laboratory us...

Shrinkage and warpage is a leading fact in casting. It is common to compensate shrinkage by scaling the tool by a certain percentage. The transformed 3D CAD model of a final product is used for tool generation. The transformations of CAD model include 3D scaling or external surface offset. Both methods are proportional and uniform in all three axes, and they are already included in a vast varie...

This paper describes the principles of dynamic referencing for optical CMMs and demonstrates the advantages of this new functionality in terms of measurement accuracy in shop floor conditions. Recent optical triangulation–based CMMs are now able to simultaneously measure multiple 3D points. With the help of markers placed on the part being measured, it is now possible to continuously monitor an...

Thermal issues are relatively well developed and described in machine tools and their development is quite rapid in recent decades. This is related to increased awareness of the impact of thermal conditions on the accuracy and efficiency of their work and the increased requirements of users (up to 75% of the overall geometrical errors of machined workpieces can be induced by the effects of temp...

This paper describes a three-dimensional (3D) digital sonomicrometry approach for locating and tracking 3D objects. A commercial digital sonomicrometry system was employed to measure scalar distances between omnidirectional sonomicrometers. 3D coordinates were then derived using the statistical technique of multidimensional scaling (MDS). 3D digital sonomicrometry was directly compared with bip...

In this article, a dysfunctional rotor blade belonging to a 3-MW Ruston PT-85ME steam turbine is analyzed from mechanical and metallurgical perspectives. First, using the quant metric method, the chemical composition of the alloy is determined at several parts of the blade.Then, in order to model the blade, the points of the airfoil curve are obtained using CMM (Coordinate Measuring Machine) an...