Rotary mount design for a chromatic confocal sensor, involving additive manufacturing and an opened air bearing
| dc.contributor.advisor | Giusca, Claudiu | |
| dc.contributor.advisor | Morantz, Paul | |
| dc.contributor.advisor | Shore, Paul | |
| dc.contributor.author | Sanz, Claude | |
| dc.date.accessioned | 2024-08-29T11:00:05Z | |
| dc.date.available | 2024-08-29T11:00:05Z | |
| dc.date.freetoread | 2024-08-29 | |
| dc.date.issued | 2018-02 | |
| dc.description | Shore, Paul - Associate Supervisor | |
| dc.description.abstract | In the field of high energy physics, the characterisation and positioning in space of a wire with a diameter of 0.1 mm is one of the steps to increase the precision of future accelerators’ pre-alignment. This reference wire is measured within a high accuracy Coordinate Measuring Machine (CMM) to reduce its positioning uncertainty. No sensor could measure the wire position within the targeted uncertainty. This thesis addresses this issue by proposing a design for the Shape Evaluating Sensor: High Accuracy & Touchless (SESHAT). The SESHAT operates a chromatic confocal sensor. The sensor is fixed to a rotor with a radial opening to allow the stretched wire to traverse it. This rotor is guided by a high precision air bearing controlled by a piezoelectric actuator. The mass limit for the stylus system of the CMM entailed the additive manufacturing of a hollow rotor. The high likelihood of particles on the wire surface involved a form deviation capability for the SESHAT, to reduce position measurement uncertainty. The aim of the research was to design a sensor enabling the Leitz Infinity CMM to perform non-contact form measurement on the PACMAN reference wire to permit its axis positioning with an uncertainty such that 3σ < 0.5 µm. The novelty emphasised in this thesis is focused on three main contributions. The form measurement uncertainty reduction obtained by using a chromatic confocal sensor for non-contact measurement on a wire surface is the first contribution. A mathematical model describing the behaviour of air pads over a through hole in the bearing surface composes the second contribution to knowledge. The demonstrated ability to obtain a micrometric form deviation on a rotary symmetric complex shape generated by additive manufacturing of titanium is the third contribution | |
| dc.description.coursename | PhD in Manufacturing | |
| dc.identifier.uri | https://dspace.lib.cranfield.ac.uk/handle/1826/22865 | |
| dc.language.iso | en | |
| dc.publisher | Cranfield University | |
| dc.publisher.department | SATM | |
| dc.rights | © Cranfield University, 2018. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder. | |
| dc.subject | Metrology tool | |
| dc.subject | High Precision Mechanics | |
| dc.subject | Reference | |
| dc.subject | Alignment | |
| dc.subject | Particle Accelerator | |
| dc.subject | Compact Linear Collider CLIC | |
| dc.subject | Coordinate Measuring Machine | |
| dc.subject | European Centre for Nuclear Research CERN | |
| dc.title | Rotary mount design for a chromatic confocal sensor, involving additive manufacturing and an opened air bearing | |
| dc.type | Thesis | |
| dc.type.qualificationlevel | Doctoral | |
| dc.type.qualificationname | PhD |