An analog electronic method to solve the nonlinear errors is proposed in this paper. Precision and possible measuring range of an interferometry are limited by the errors. Nonlinear errors, including direct current (DC) offset, lack of quadrature, and unstable amplitude, are inevitable in the sinusoidal waves of interferometry due to unsatisfactory detector system.
#Shotbot gantry verification
The volumetric errors of tested OMM were accurately assessed by experimental verification to the accuracy of 93%, which proved the effectiveness and applicability of the VT method. The geometric errors in each axis were simultaneously measured by the developed multi-degree-of-freedom measuring systems (MDFMs) to reduce the measurement time and uncertainty. In this paper, a new volumetric error modeling method developed by the author’s group, called the vector transfer (VT) method based on the Abbe principle and Bryan principle, was applied to a moving gantry-type optical measuring machine (OMM). Besides, most commercial instruments can only provide one-by-one geometric error measurement, which is too time consuming. Currently, the most popular volumetric error model with homogeneous transformation matrix (HTM) method is based on linkage-chain kinematics, which is lack of measurement principles in practice. Its actual positional shift of the functional point (FP) from the ideal position in three directional components within the working volume is called the volumetric error and is mainly caused by geometric errors of each axis. Gantry-type machines are normally large-scaled manufacturing equipment, such as contact/noncontact measuring machines and cutting machines.
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