Compliant tool modelling and design for chatter suppression in highly flexible turning
department or school: Applied Science, Faculty of
department or school: Mechanical Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Quiring, Shelby Alexandra
issued: 2025-09-16T21:46:43Z
issued: 2025
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Turning operations are commonly limited by chatter vibrations, in which some combinations of spindle speed, feed rate, and depth of cut cause the tool or workpiece to vibrate uncontrollably. Chatter limits material removal rates, can damage the tool and workpiece, and is highly undesirable. This thesis presents a novel actuator that passively damps workpiece vibrations when turning highly flexible workpieces, such as a long slender rod, or a hollow tube, where the flexibility of the workpiece is the dominant source of chatter. Traditionally, CNC machines and tools are designed to be highly rigid, ostensibly to minimize chatter. However, for flexible workpieces, a rigid tool is not optimal for chatter minimization. This thesis proposes that a flexible tool with a high damping ratio can significantly improve the chatter stability of the tool-workpiece system when the toolâs natural frequency and stiffness are tuned optimally. The proposed actuator has two subsystems, comprising a primary compliant damped tool tip stage, mounted on a secondary linear actuation stage. The tool compliance is delivered by stacking a number of plate springs, which leads to tool flexibility only in the flexible radial direction of the workpiece. This is the direction where the regenerative chip thickness causing chatter is produced. The high damping ratio is delivered by closely-spaced plates in an oil bath, where shearing a thin oil film between plates provides linear damping with no static friction. A stepper motor linear actuator compensates for the static deflection errors from the flexible tool deforming under cutting loads. The mathematical model of the system consists of a workpiece and tool each with single degree of freedom dynamics, and a digital controller that compensates for the deflection errors. The actuator and supporting electronics have been designed, manufactured, and instrumented with vibration sensors. The performance of the actuator has been experimentally evaluated by…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/92344
note: Compliant Tool Modelling and Designfor Chatter Suppression in HighlyFlexible TurningbyShelby Alexandra QuiringB.A.Sc., The University of British Columbia, 2023A THESIS SUBMITTED IN PARTIAL FULFILLMENT OFTHE REQUIREMENTS FOR THE DEGREE OFMASTER OF APPLIED SCIENCEinTHE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES(Mechanical Engineering)THE UNIVERSITY OF BRITISH COLUMBIA(Vancouver)September 2025© Shelby Alexandra Quiring 2025The following individuals certify that they have read, and recommend tothe Faculty of Graduate and Postdoctoral Studies for acceptance, the thesisentitled:Compliant Tool Modelling and Design for Chatter Suppression in HighlyFlexible Turningsubmitted by Shelby Alexandra Quiring in partial fulfillment of the re-quirements forthe degree of Master of Applied Sciencein Mechanical EngineeringExamining Committee:Hongshen Ma, Professor, Mechanical Engineering, UBCSubstitute Examiner, in place of SupervisorXiaoliang Jin, Associate Professor, Mechanical Engineering, UBCSupervisory Committee MemberRyozo Nagamune, Professor, Mechanical Engineering, UBCSupervisory Committee MemberAdditional Supervisory Committee Members:Yusuf Altintas, Professor, Mechanical Engineering, UBCSupervisoriiAbstractTurning operations are commonly limited by chatter vibrations, in whichsome combinations of spindle speed, feed rate, and depth of cut cause thetool or workpiece to vibrate uncontrollably. Chatter limits material removalrates, can damage the tool and workpiece, and is highly undesirable.This thesis presents a novel actuator that passively damps workpiece vibra-tions when turning highly flexible workpieces, such as a long slender rod, ora hollow tube, where the flexibility of the workpiece is the dominant sourceof chatter. Traditionally, CNC machines and tools are designed to be highlyrigid, ostensibly to minimize chatter. However, for flexible workpieces, arigid tool is not optimal for chatter minimization. This thesis proposes thata flexible tool with a high damping rati…
has type: Thesis/Dissertation
date issued: 2025-11
is shown at: 10.14288/1.0450153
language: eng
degree discipline: Mechanical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Altintas, Yusuf, 1954-
type: Text
identifier URI: http://hdl.handle.net/2429/92344