Theresultsofthefiniteelementanalysisandthenaturalfrequenciesobtainedfromtheimpacthammertestaregiveninthissection.InSec,aPC-basedCNCsystemdevelopedforthe-axismillingmachineisdiscussed.Severalmoderncontrolschemesincludingcontroldesign,inputshapingcontrol,disturbanceobserver,andcross-coupledcontrolarediscussedwiththeirexperimentalresultstoshowtheireffectivenessanddrawbacksinSec.TheconcludingremarkswillbegiveninSec...Designofa-axisMillingMachineMicromachinetoolsarerequiredtohavehighmachiningaccuracywhileprovidingenoughstiffness.Toestimatebasicmachiningperformanceandstiffnessofamicromachinetool,aminiaturized-axismillingmachinewasbuiltandusedasatestbed.Fig.showsthe-axismillingmachineanditsspecifications.Ithasamini-desktopsizeofmmanditscut-tingvolumeismm.TheverticallyinstalledXYstageisdrivenbyvoice-coilmotors,andforthez-axis,amagneticallypreloadedairbearingandalinearmotorareused述H_∞控制器z轴在低频率范围内具有高增益,参考命令也显示出积极反应。