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Dynamic Characterization of a Head Unit with a Small High Speed Spindle in Mesoscale Machine Tools
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lee, Jaeha Yang, Seung-Han |
| Copyright Year | 2006 |
| Abstract | INSTRUCTIONS For machining process using rotation of a tool, spindle error directly affects the quality of the machined parts. Spindle error can be divided into several error components such as radial errors, axial errors, etc.[1,2] Especially, there exist two kinds of error motion in spindle error along the radial direction. Synchronous error motion due to bearing imperfection and misalignment causes out of roundness during cutting a round hole. Asynchronous error motion is related with bearing wear, improper preload and structural vibration and affects the surface finish of the machined parts. Research for identifying the radial error motion was begun long time ago. Tlusty measured spindle error motion by using non-contact capacitance sensors and an artifact such as master ball which is popularly used now.[2] This traditional measurement system assumes that there is no inaccuracy of an artifact used. For more precise measurement, the inaccuracy of the artifact such as eccentricity and roundness should be removed. Many researchers have developed various methods to eliminate the effect of the artifact.[3,4] Although the developed methods like multi-probe and multi-step method has good performance and can be used for nanometerlevel measurement, some devices such as turntable and stylus are required and it takes a lot of time to carry out measurement.[5] For measuring the error of a small spindle system in a meso-scale machine tool, a small precise artifact and an index table are needed to apply the above techniques. It is cost-effective to find an alternative way with a less precise artifact as machining system does not require tens nanometer-level precision. In this study, a method to measure radial error motion of a small spindle is proposed. It is suggested that a new and simple method to separate artifact errors from the measured data without additional devices. The spindle error can be affected by a head structure as well as a spindle itself. The dynamic characteristics of the spindle head and a spindle are the important factors to decide spindle error motion[6]. Moreover, a spindle at over tens thousands revolution per minute is needed to adapt for the required cutting speed as the small tools is used in a meso-scale system. Therefore dynamic characteristics of a head structure with a spindle become more significant in the design of the meso-scale systems. The influence of the dynamic characteristics of a spindle unit on spindle error is examined in this study. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.aspe.net/publications/Annual_2006/POSTERS/1EQUIP/1ANALY/2033.PDF |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
