Error Separation Method for Precision Measurement of the Run-Out of a Microdrill Bit by Using a Laser Scan Micrometer Measurement System

Abstract

This paper describes an error separation method for a precision measurement of the run-out of a microdrill bit by using a measurement system consisting of a concentricity gauge and a laser scan micrometer (LSM). The proposed error separation method can achieve a sub-micrometric measurement accuracy of the run-out of the microdrill bit without the requirement of ultra-precision rotary drive devices. In the measurement, the spindle error motion of the concentricity gauge is firstly measured by using the LSM and a small-diameter artifact, instead of the conventionally used displacement probes and large-diameter artifact, in order to determine the fine position of the concentricity gauge when the spindle error motion is at its minimum. The microdrill bit is rotated at the fine position for the measurement of the run-out, so that the influence of the spindle error motion can thus be reduced, which could not be previously realized by commercial measurement systems. Experiments were carried out to verify the feasibility of the proposed error separation method for the measurement of the run-out of the microdrill bit. The measurement results and the measurement uncertainty confirmed that the proposed method is reliable for the run-out measurement with sub-micrometric accuracy.

On-machine diameter measurement of a cylindrical workpiece with a reference artefact

“…In this study, a commercial optical micrometer [18,19] is employed for on-machine measurement of the diameter of a ceramic cylindrical workpiece. Figure 1(a) shows a schematic of the typical optical configuration of an optical micrometer mainly composed of three lenses, a high-brightness LED and a charge-coupled device (CCD) line camera.…”

“…However, this type of on-machine measurement can be affected by the error motions of machine axes, and it is necessary to make some efforts to improve the accuracy of measurement [3]. Meanwhile, in the case of measuring the diameter of a cylindrical workpiece, the influence of error motions of machine axes can be avoided by employing an optical micrometer [18,19]. Since the optical micrometer can measure a workpiece in various sizes having a diameter ranging from 0.5 mm to 60 mm, it is suitable as the sensor for on-machine diameter measurement.…”

Real‐time droplet size analysis using laser micrometer as a process analytical technology tool for continuous dripping process

“…The laser detection technique is a nondestructive measuring tool based on the theory of laser diffraction or charge-coupled device (CCD) light projection. Laser detection techniques have been used in many industries, such as on-line detection of particle size in pharmaceuticals [19][20][21][22], production and detection of parts in manufacturing [23][24][25][26], and material determination in medicine [27]. Considering laser detection technique and its wider applications, the present study was conducted to develop an on-line analysis and monitoring system based on a high-detection sensitivity CCD laser micrometer for the quantitative visualization of droplets during the dripping process.…”