Q.Whyismeasuringofbalancingspeedofthecomponentvery
importantinabalancingmachine?
A.Balancingmachineisanindustrialmachine.Themachineis
locatedinafactoryenvironmentalongtheprocessline. Manytypes
ofindustrialnoiseselectrical, meccanica, magneticwillexistinan
industrialenvironment. Besidesthisbalancingmachinehasdrive
elementslikemotors, pulegge, beltswhichalsorotatealongwiththe
componente. Thecomponentismountedonrollers, androllersalso
rotatealongwiththecomponent. Thetransducerswillpickup
signalsfromallrotatingelements. Theelectronicsofthebalancing
machineneedsareferencesignaltoextracttheunbalancesignalof
thecomponentbeingbalanced. Thespeedsignalofthecomponent
beingbalancedprovidesthereferenceforsignalextraction.
Inolderstroboscopemachines, itcanbeobservedthatthe
unbalancelocationwillstartshifting/oscillatingoverawideangle
whenbalancingisdone. Inmodernmachineswithphaselockloop,
theshiftofangleisreducedtoinsignificantlevels.
Q.Whydoweneedmultispeedbalancingmachines?
A.Multispeedbalancingmachinesarenormallybigsizemachines
andmachineswhichhandlearangeofjobs. Incasethecomponent
isamassproducedcomponentwithpredictablelevelsof
squilibrio, singlespeedmachinescanbetunedtobalancethe
componentsfasterandwellwithinthetolerance. Butinheavy
componenti, thelevelofunbalancemaynotbeknowninitially. Esso
maybehazardousfromthepointofsafetytodirectlyrunthe
componentattherequiredbalancingspeed. Così, heavycomponents
arerunatlowerspeeds, initialbalancingisdone. Furtherbalancing
isdoneathigherspeedstillthedesiredlevelofaccuracyis
Raggiunto.
Q.DoweneedtoputDynamicBalancingMachinesonafoundation?
A.Balancingmachineisanindustrialmachineusedtomeasure
Vibrationandcomputetheresidualunbalance.ModernHardBearing
BalancingMachinesareforcemeasuring.ItisessentialthattheMachine
donotvibrateorshakeforcorrectmeasurementofunbalanceamountand
phaseAngle.
Formorepreciseresultsitisrequiredtomountthemachinesfirmlyonanindustrialfloor.
Q.Whatisunbalancereductionratio?
A.Balancingmachineinstrumentationindicatesthelevelofunbalanceon
thecomponentbeingbalanced. Agoodmachinecanindicateavalueand
whenacorrectionequivalenttothevalueshownisexecutedthenextresultantresidual
ofthefirstindicatedvalue unbalanceshouldbebelow90 - 95%.
Peresempio, onthefirstrun, ifthemachinehasshownsay50gramatagivenlocation.
Whena50gramweightisaddedatthatlocationandaresidualunbalancereadingtaken,
incasethemachineindicatesavalueof5gramandbelow, thenitissaidthatthemachine
ishavinganunbalancereductionratioofabout90%.
FormoredetailsrefertotheISOstandards1940, 2953etc.
Q.Whatisplaneseparation,crosseffect,influence?
A.Intwoplanedynamicbalancingmachines,theresultsareindicatedintwo
correctionplanes. Whenacorrectionismadeononeplane, theeffectofthe
unbalancecompensationonthesecondplane, isdefinedasplaneseparation
orcrosseffectorinfluence. Normalmente, theplaneseparationwillbewellbelow3%.
Incomputerbasedhardbearingdynamicbalancingmachines, theplane
separationisachievedmathematically. Souserstendtogetbetter
levelsofplaneseparationoncomputerizedhardbearingdynamic
balancingmachinesandthatisnotthecasewithsoftbearing
machineswhereinunbalancesignalsareelectronicallymixedand
modulatedforindicatingtheresults.
